Institut für Raumbezogene Informations- und Messtechnik
Hochschule Mainz - University of Applied Sciences

Prof. Dr.-Ing. Frank Boochs

Prof. Dr.-Ing. Frank Boochs

Fachbereich Technik –
Geoinformatik & Vermessung
Raum: C1.21
Telefon: +49 6131-628-1432
Fax: +49 6131-628-91432

Funktionen

  • – GeschäftsfĂĽhrender Institutsleiter
  • – Professor fĂĽr Angewandte Informatik
  • – Leiter des Labors fĂĽr Photogrammetrie

Forschung

Anzeigename: 
Prof. Dr.-Ing. Frank Boochs

E-Mail

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Telefon: 
+49 6131-628-1432
Fax: 
+49 6131-628-91432
Raum: 
C1.21
Funktionen: 
Geschäftsführender Institutsleiter
Professor fĂĽr Angewandte Informatik
Leiter des Labors fĂĽr Photogrammetrie

Projekte

Der Königspalast stellte über mehrere Jahrhunderte das offensichtlichste Symbol für Macht und Reichtum der Herrscher von Qatna dar. Offenbar scheuten seine Erbauer keine Kosten…
The KnowDIP project aims at the conception of a framework for an automatic object detection in unstructured and heterogeneous data. This framework uses a representation of human…

Publikationen

How to optimally record cultural heritage objects? Decision support through connected knowledge.

2017

Wefers, S.,
Karmacharya, A.,
Boochs, F.,
Heinz, G.

BibTex

EVA Berlin 2017. Elektronische Medien & Kunst, Kultur und Historie 24. Berliner Veranstaltung der internationalen EVA-Serie Electronic Media and Visual Arts, 2017

Optical recording of material cultural heritage (CH) is a multidisciplinary activity where the understanding of cross-disciplinary semantics is vital for a successful completion. In many cases, a lack of understanding of transdisciplinary semantics slows this process down. The end users who are mostly humanities experts lack the technical knowledge of spatial and spectral recording and could therefore demand more than what is actually required or sufficient for the intended CH application. The negotiations between technical experts and the end users are a tedious process. We present a semantic-based decision support system, COSCHKR, that employs reasoning and recommends optimal recording technology(ies) according to the application requirements of the recorded and processed data. COSCHKR is an ontology-based knowledge model that implies the development of semantic technologies within the Semantic Web framework. It represents formalized knowledge of the disciplines involved in the process of optical recording of material CH. The paper describes the applicability of the model in spatial, spectral, and visualization applications and summarises current possibilities and challenges.


Towards the design of respond action in disaster management using knowledge modeling

2017

Prudhomme, C.,
Roxin, A.,
Cruz, C.,
Boochs, F.

BibTex

The Fourth International Conference on Information Systems for Crisis Response and Management in Mediterranean Countries (ISCRAM-med 2017)

This position paper highlights current problems linked to the aspects of the multi-agency collaboration during disaster response. The coordination and cooperation depend on the information sharing and use which must face up to interoperability, access rights, and quality problems. The research project aims at providing an assessment of information impact on the disaster response in order to support the decisionmaking about what information shared or what quality of data used to improve the response efficiency. Our research approach propose to combine an information system able to integrate heterogeneous data and a simulation system to assess different strategies of information sharing, dissemination and use. A knowledge base is used as a bridge between information system and simulation system. This knowledge base allows for designing dynamically a simulation according to open data and for managing the own knowledge and information known by each agent.


Integration, quality assurance and usage of geospatial data with semantic tools

2017

Homburg, T.,
Prudhomme, C.,
Boochs, F.,
Roxin, A.,
Cruz, C.

BibTex

gis.Science

Ontology-based Knowledge Representation for Recommendation of Optimal Recording Strategies - Photogrammetry and Laser Scanning as Examples.

2017

Wefers, S.,
Karmacharya, A.,
Boochs, F.

BibTex

gis.Science

Experts’ knowledge about optical technologies for spatial and spectral recording is logically structured and stored in an ontology-based knowledge representation with the aim to provide objective recommendations for recording strategies. Besides operational functionalities and technical parameters such as measurement principles, instruments, and setups further factors such as the targeted application, data, physical characteristics of the object, and external influences are considered creating a holistic view on spectral and spatial recording strategies. Through this approach impacting factors on the technologies and generated data are identified. Semantic technologies allow to flexibly store this knowledge in a hierarchical class structure with dependencies, interrelations and description logic statements. Through an inference system the knowledge can be retrieved adapted to individual needs.


Automatic Integration of Spatial Data into the Semantic Web

2017

Prudhomme, C.,
Homburg, T.,
Ponciano, J.J.,
Boochs, F.,
Roxin, A.,
Cruz, C.

BibTex

WebIST 2017

For several years, many researchers tried to semantically integrate geospatial datasets into the semantic web. Although, there are many general means of integrating interconnected relational datasets (e.g. R2RML), importing schema-less relational geospatial data remains a major challenge in the semantic web community. In our project SemGIS we face significant importation challenges of schema-less geodatasets, in various data formats without relations to the semantic web. We therefore developed an automatic process of semantification for aforementioned data using among others the geometry of spatial objects. We combine Natural Language processing with geographic and semantic tools in order to extract semantic information of spatial data into a local ontology linked to existing semantic web resources. For our experiments, we used LinkedGeoData and Geonames ontologies to link semantic spatial information and compared links with DBpedia and Wikidata for other types of information. The aim of our experiments presented in this paper, is to examine the feasibility and limits of an automated integration of spatial data into a semantic knowledge base and to assess its correctness according to different open datasets. Other ways to link these open datasets have been applied and we used the different results for evaluating our automatic approach.


i3mainz - Jahresbericht 2016

2017

Boochs, F.,
Bruhn, N.

PDF / BibTex

n.A.

Im Jahresbericht werden die Aktivitäten des i3mainz in komprimierter Form vorgestellt.


Analyse von Bildresiduen mit Machine-Learning im Rahmen von Kamera-Kalibrierungen

2017

Kisser, W.,
Boochs, F.,
PAULUS, D.

BibTex

n.A.

Photogrammetrie ermöglicht es, Objekte mithilfe von Digitalbildern zu vermessen. Bei optimalen Messbedingungen sind Qualitätsunterschiede der abgeleiteten Maße vor allem auf die mathematische Modellierung des verwendeten Sensors und des Objektivs zurückzuführen. Photogrammetrische Kalibrierungen erfolgen meist mittels Bündelblockausgleichung. Diese gestattet es, vielerlei statistische Kennzahlen abzuleiten. Eine tiefer gehende Analyse der berechneten Parameter, Standardabweichungen, Korrelationen und deren Verteilungen kann Aufschluss darüber geben, ob das verwendete Kalibriermodell Schwächen aufweist. Solche Defizite können sich durch systematische Restfehler im Bild- oder Objektraum äußern. Da solche Restfehler auch zu Ungenauigkeiten in den daraus abgeleiteten Informationen führen können, ist deren mathematischer Nachweis und anschließende Kompensation zur Erzielung höchster Genauigkeiten unausweichlich. Neueste Ansätze nutzen Korrekturterme, um Residuensystematiken schon während der Bündelblockausgleichung zu modellieren. Dieser Beitrag beschreibt, wie auch Machine-Learning-
Techniken dabei helfen können, verbliebene systematische Abweichungen in Bildresiduen nachzuweisen, ohne dass hierzu ein Eingriff in die Bündelblockausgleichung notwendig ist. Dies wird im ersten Schritt anhand von Beispieldaten erläutert. Im zweiten Schritt wird die Wirkung dieser Vorgehensweise an einer realen Kamerakalibrierung verdeutlicht. Abschließend erfolgt eine Diskussion der im Zuge dieser Arbeit erzielten Resultate und möglicher Eignung dieses Verfahrens in der Praxis.


Knowledge Based Recommendation on Optimal Spectral and Spatial Recording Strategy of Physical Cultural Heritage Objects

2016

Karmacharya, A.,
Wefers, S.,
Boochs, F.

BibTex

SEMAPRO 2016: The 10th Internat. Conference on Advances in Semantic Processing

Ontologies have traditionally been used to represent knowledge of a specific domain. They are also used to provide a base to infer the knowledge present inside them. However, the applications of ontologies within the Cultural Heritage (CH) community have been restricted to providing standard documentation for significant heritage objects. E.g., widely used ontology within CH disciplines, International Committee for Documentation Conceptual Reference Model (CIDOC CRM) is designed to provide standards in documenting archival information of physical CH object. There has been hardly any work relating the objects to their documentation purposes. In this paper, we present the Colour and Space in Cultural Heritage Knowledge Representation (= COSCHKR) ontology – a multi-faceted ontology. With COSCHKR, we present a system that infers inter-woven descriptive semantics of different involved CH disciplines in recording CH objects to recommend optimal spatial and spectral technical solutions to humanities experts and guide through the underlying complexities while recording their objects. It takes numbers of facts into consideration including physical characteristics of the CH objects, the characteristics of their surroundings and even other relevant facts such as budget or staff competence to infer against the characteristics of the technologies for a proper recommendation. In contrast to a typical Recommender System, which does the same for web-based content through stochastic methods, we use descriptive semantics at the concept level.


Interdisciplinary Dialogue Towards an Enhanced Understanding of Optical Techniques for Recording Material Cultural Heritage - Results of a COST Action

2016

Boochs, F.,
Bentkowska-Kafel, A.,
Wefers, S.

BibTex

C. E. Catalano, L. De Luca (eds): Proceedings EUROGRAPHICS Workshop on Graphics and Cultural Heritage (2016), Genova, Italy, pp. 219-222

The COST Transdomain Action TD1201, Colour and Space in Cultural Heritage [COSb], 2012-2016, contributes to the conservation and preservation of cultural heritage (CH) by enhancing shared understanding, between experts from various disciplines, of the spectral and spatial recording of physical CH objects. Optimal recording, adapted to the requirements of a CH application, should involve experts from multiple disciplines and industries. Such an interdisciplinary approach is necessary "in order to protect, preserve, analyze, understand, model, virtually reproduce, document and publish important CH in Europe and beyond" [COSa]. In order to fulfil this goal, experts from 28 European countries entered into a multidisciplinary dialogue trying to establish a common understanding of spatial and spectral recording techniques best suited for particular CH applications. Several COSCH groups worked on the characterisation of spatial and spectral recording techniques; the use of algorithms and processing chains; and requirements of analysis, restoration and visualisation of CH surfaces and objects. A range of possible applications of optical techniques, now available to recording and examination of CH objects, have been tested through six COSCH case studies [BKM17]. These projects have exposed the challenges of common understanding of the processes involved, and differences in disciplinary research needs and methods. A number of issues have been identified, sometimes as basic as lack of common specialist terminology and relevant technical standards. The complexity of the field became apparent in the course of designing COSCHKR, ontological knowledge representation, which employs semantic technologies. After four years of interdisciplinary dialogue, COSCH leaves a legacy that will help the dialogue to continue, technology to develop, and specialist training to better respond to the actual needs of the interdisciplinary CH research communities.


Knowledge based Object Detection in Images and Point clouds

2016

Ponciano, J.J.,
Boochs, F.,
Trémeau, A.

BibTex

Molas 2016

Analyse von Bildresiduen mit Machine-Learning im Kontext von Kamera-Kalibrierungen

2016

Kisser, W.,
Boochs, F.,
Paulus, D.

BibTex

Oldenburger 3D Tage 2016

Photogrammetrie ermöglicht es, Objekte mit Hilfe von Digitalbildern zu vermessen. Bei optimalen Messbedingungen sind Unterschiede in der Qualität der abgeleiteten Maße vor allem auf die mathematische Modellierung des verwendeten Sensors und der Linse zurückzuführen. Kalibrierungen erfolgen meist mittels Bündelblockausgleichung, die es gestattet, daraus vielerlei statistische Kennzahlen abzuleiten. Eine tiefergehende Analyse der berechneten Parameter, Standardabweichungen, Korrelationen und deren Verteilungen kann Aufschluss geben, ob das verwendete Kalibriermodell Schwächen aufweist. Solche Defizite können sich durch systematische Restfehler im Bild- oder Objektraum äußern. Da solche Restfehler zu Ungenauigkeiten in den daraus abgeleiteten Informationen führen können, ist deren mathematischer Nachweis und anschließende Kompensation zur Erzielung höchster Genauigkeiten unausweichlich. Neueste Ansätze nutzen Korrekturterme, um solche Systematiken schon während der Bündelblockausgleichung zu modellieren. Der vorliegende Beitrag beschreibt, wie auch Machine-Learning Techniken dabei helfen können, verbliebene systematische Abweichungen in Bildresiduen nachzuweisen, ohne dass hierzu ein Eingriff in die Bündelblockausgleichung notwendig ist. Dies wird im ersten Schritt anhand von Beispieldaten erläutert. Im zweiten Schritt wird die Wirkung dieser Vorgehensweise an einer realen Kamerakalibrierung verdeutlicht. Abschließend erfolgt eine Diskussion der im Zuge dieser Arbeit erzielten Resultate und möglicher Eignung dieses Verfahrens in der Praxis.


Detection and classification of railway switches in point clouds of the German railway system

2016

Ponciano, J.J.,
Prudhomme, C.,
Boochs, F.

BibTex

n.A.

SEMANTIC CATALOGUE TO MANAGE DATA SOURCES IN DISASTER MANAGEMENT SYSTEM

2016

Prudhomme, C.,
Roxin, A.,
Cruz, C.,
Boochs, F.

BibTex

The 15th International Conference on Informatics in Economy 2016

With the climate change, disasters occur more frequently and the need for efficient disaster management systems becomes highly recommended to save lives. This paper deals with a study of existing systems, with the intention of determining the main recent improvement in the domain. The heterogeneous data integration process is a major central point. Thus, a semantic system with three main components is proposed as a new position in the disaster management systems. These three components are a knowledge base, a reasoner and a semantic catalogue. The knowledge base provides a controlled vocabulary and allows storing information retrieval. The semantic catalogue facilitates the access to data sources adapted to user's and agent's needs. The reasoner analyzes the information in the knowledge base thus replying to the user queries. In addition, the reasoner aims at adding automatically new data sources in the semantic catalogue. The fast access to a great number of data sources is of benefit for decision-making systems such as disaster management systems.


SIVT - Processing, Viewing, and Analysis of 3D Scans of the Porthole Slab and Slab B2 of ZĂĽschen I

2016

Wefers, S.,
Reich, T.,
Tietz, B.,
Boochs, F.

BibTex

CAA2015 - Keep the Revolution Going. Proceedings of the 43rd Annual Conference on Computer Applications and Quantitative Methods in Archaeology.

Development of a platform recommending 3D and spectral digitisation strategies.

2016

Wefers, S.,
Karmacharya, A.,
Boochs, F.

BibTex

Virtual Archaeology Review

Spatial and spectral recording of cultural heritage objects is a complex task including data acquisition, processing and analysis involving different technical disciplines. Additionally, the development of a suitable digitisation strategy satisfying the expectations of the humanities experts needs an interdisciplinary dialogue often suffering from misunderstanding and knowledge gaps on both the technical and humanities sides. Through a concerted discussion, experts from the cultural heritage and technical domains currently develop a so-called COSCH KR (Colour and Space in Cultural Heritage Knowledge Representation) platform that will give recommendations for spatial and spectral recording strategies adapted to the needs of the cultural heritage application. The platform will make use of an ontology through which the relevant parameters of the different domains involved in the recording, processing, analysis, and dissemination of cultural heritage objects are hierarchically structured and related through rule-based dependencies. Background and basis for this ontology is the fact that a deterministic relation exists between (1) the requirements of a cultural heritage application on spatial, spectral, as well as visual digital information of a cultural heritage object which itself has concrete physical characteristics and (2) the technical possibilities of the spectral and spatial recording devices. Through a case study which deals with the deformation analysis of wooden samples of cultural heritage artefacts, this deterministic relationship is illustrated explaining the overall structure and development of the ontology. The aim of the COSCH KR platform is to support cultural heritage experts finding the best suitable recording strategy for their often unique physical cultural heritage object and research question. The platform will support them and will make them aware of the relevant parameters and limitations of the recording strategy with respect to the characteristics of the cultural heritage object, external influences, application, recording devices, and data.


Interpreting Heterogenous Geospatial Data using Semantic Web Technologies

2016

Homburg, T.,
Prudhomme, C.,
WĂĽrriehausen, F.,
Karmacharya, A.,
Boochs, F.,
Cruz, C.,
Roxin, A.M.

BibTex

Computational Science and Its Applications -- ICCSA 2016

The paper presents work on implementation of semantic technologies within a geospatial environment to provide a common base for further semantic interpretation. The work adds on the current works in similar areas where priorities are more on spatial data integration. We assert that having a common unified semantic view on heterogeneous datasets provides a dimension that allows us to extend beyond conventional concepts of searchability, reusability, composability and interoperability of digital geospatial data. It provides contextual understanding on geodata that will enhance effective interpretations through possible reasoning capabilities.  We highlight this through use cases in disaster management and planned land use that are significantly different. This paper illustrates the work that firstly follows existing Semantic Web standards when dealing with vector geodata and secondly extends current standards when dealing with raster geodata and more advanced geospatial operations.


i3mainz - Jahresbericht 2015

2016

Boochs, F.,
Bruhn, N.,
Wachter, J.

PDF / BibTex

n.A.

Im Jahresbericht werden die Aktivitäten des i3mainz in komprimierter Form vorgestellt.


SIVT – Processing, viewing and analysis of 3D scans of the porthole slab and slab b2 of Züschen I

2015

Wefers, S.,
Reich, T.,
Tietz, B.,
Boochs, F.

BibTex

CAA

Semantic based Structuring of 3D technologies for their optimized use in cultural heritage documentation.

2015

Karmacharya, A.,
Wefers, S.,
Boochs, F.

BibTex

43rd Conference of Computer Applications and Quantitative Methods in Archaeology, CAA 2015, Siena, Book of Abstracts.

Constant technological progress results in new possibilities to produce reliable and rich spatial data of cultural heritage objects: for instance, museums have started to digitize their collections, more and more archaeological excavations or features and entire CH buildings have been documented in 3D. It is now necessary to establish connections among different CH disciplines and several technical disciplines, and to work on collaborative projects.

Technicians and CH experts together evaluate the best technique for specific CH object documentation, implementation and use. This discussion arises from the knowledge gaps of each counterpart in respect to the other discipline. Projects such as Agora 3D (see below) clearly demonstrate the need for an evaluation of the different available techniques.

In order to make optimal use of these technological capabilities, it is important to identify and name the information required to best serve the reasoning processes in these application fields. Correspondingly it is necessary to know about the characteristics of digitization techniques producing the content adapted to the needs of the applications. Due to the considerable complexity of instruments and processes producing the data, it is helpful to have a clear structure which relates the capabilities of the instruments to the requirements of the applications.

The COST Action TD1201 “Colour and Space in Cultural Heritage (COSCH)” takes this need into account, aiming to enhance the understanding among these disciplines. We will focus on the already listed, structured and evaluated available 3D technologies. At the same time, experts in spectral and CH research started to list, structure, and evaluate their knowledge. These evaluations yield a structure of technologies, and ultimately the techniques and instruments using their characteristics. The understanding of these characteristics provides insights for their potential applications. The ontology knowledge model accessible through so-called “COSCHKR App” provides a knowledge structure. It benefits from the development of semantic technologies from the Semantic Web framework. Semantics, which provide meanings, are captured through the conceptual structure and are defined through the ontology. The overall aim of this ontology is the development of a software tool to enable a better understanding of data acquisition techniques and their support to optimally realize cultural heritage applications.


Support of Petroglyph analysis through processing and viewing of 3D scans.

2015

Reich, T.,
Boochs, F.,
Wefers, S.,
Tietz, B.

BibTex

43rd Conference of Computer Applications and Quantitative Methods in Archaeology, CAA 2015, Siena, Book of Abstracts.

Traditionally stone inscriptions or drawings are documented through pictures or rubbings. The latter ones represent an analogue copy of the stone’s surface and its features which are reproduced on paper. The disadvantage of this technique is the physical impact to the stone and the contained elements. Images reproduce the surface without contact. However, they might be affected by geometrical distortions and need appropriate lighting conditions to show the signs properly.

These problems will be avoided by means of non-contact 3D measuring techniques, like fringe projection. Such high resolution 3D techniques provide an exact geometrical copy of the original petroglyph, offering better results in legibility compared to traditional techniques. Moreover, it gives a more objective base for analysis and has less impact on the sometimes sensitive and eroded surfaces. Furthermore 3D data allows more extensive and further possibilities in processing and gives better preconditions for the interpretation.

However, depending on factors like resolution, scanned surface and degree of overlap between individual scans original 3D datasets may represent large up to really massive volumes of data. An effective use of such datasets can only be realised if they are condensed and prepared in a suitable way. This means reduction of the data volume, minimising any disturbing influence emerging from the spatial shape of the surface and emphasizing relevant information. The corresponding preparation of the data will then be a good base for a interpretation performed by the human science specialist through an adapted visualization. In addition the data should be prepared for high performance presentation to a wider community via the internet.

Processed digital copies of the Petroglyphs are visualised in order to enable the user to inspect the processed scans of the objects. By inspecting the scans the application provides a mass of functionality for achieving different views into the Petroglyphs and their appearance. This comprises on the one hand a simple 2D viewer for the processed data, and on the other hand a 3D viewer with interactive changeable light positions and water levels as well as a viewer for applying various lookup tables (colour), predefined image filters (convolution) and template matching (matching) regarding individual characters.

Provided functionality of the 3D viewer is based on features of 3D computer graphics. Surface normal vectors from the grey values of the processed scans and a light direction vector from an interactively changeable light source are computed. In addition shading is complemented by water filling, whereby the gray values are limited by the water level selected. Individual modifications are possible to improve the subjective impression by the user, trying to support him in his process of interpretation. Interactive changes of the light source directly affect the shading of the surface and provide a better idea of the 3D surface of the inscription board. Dynamic virtual water filling enables the user to obtain an even better impression of the depth of the individual characters and emphasise weathered characters.

The paper will explain the developed techniques and document its potential at selected data sets.


Jahresbericht 2014

2015

Boochs, F.,
Bruhn, N.,
Wachter, J.

PDF / BibTex

n.A.

Im Jahresbericht werden die Aktivitäten des i3mainz in komprimierter Form vorgestellt.


Knowledge guided object detection and identification in 3D point clouds

2015

Karmacharya, A.,
Boochs, F.,
Tietz, B.

BibTex

Videometrics, Range Imaging, and Applications XIII, 952804

Modern instruments like laser scanner and 3D cameras or image based techniques like structure from motion produce huge point clouds as base for further object analysis. This has considerably changed the way of data compilation away from selective manually guided processes towards automatic and computer supported strategies. However it’s still a long way to achieve the quality and robustness of manual processes as data sets are mostly very complex. Looking at existing strategies 3D data processing for object detections and reconstruction rely heavily on either data driven or model driven approaches. These approaches come with their limitation on depending highly on the nature of data and inability to handle any deviation. Furthermore, the lack of capabilities to integrate other data or information in between the processing steps further exposes their limitations. This restricts the approaches to be executed with strict predefined strategy and does not allow deviations when and if new unexpected situations arise. We propose a solution that induces intelligence in the processing activities through the usage of semantics. The solution binds the objects along with other related knowledge domains to the numerical processing to facilitate the detection of geometries and then uses experts’ inference rules to annotate them. The solution was tested within the prototypical application of the research project “Wissensbasierte Detektion von Objekten in Punktwolken für Anwendungen im Ingenieurbereich (WiDOP)”. The flexibility of the solution is demonstrated through two entirely different USE Case scenarios: Deutsche Bahn (German Railway System) for the outdoor scenarios and Fraport (Frankfort Airport) for the indoor scenarios. Apart from the difference in their environments, they provide different conditions, which the solution needs to consider. While locations of the objects in Fraport were previously known, that of DB were not known at the beginning. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.


Korrektur der Ellipsen-Exzentrizität im Kontext von Kamerakalibrierungen

2015

Kisser, W.,
Tietz, B.,
Boochs, F.,
PAULUS, D.

BibTex

Photogrammetrie, Laserscanning, Optische 3D-Messtechnik. Beiträge der Oldenburger 3D-Tage 2015

Dieser Beitrag befasst sich mit dem Einfluss der Zielmarkenexzentrizität während der Kamera-
Kalibrierung in Kombination mit verschiedenen Kalibrierkörpern. Zunächst wird
deren Einfluss auf die Resultate anhand numerischer Simulationen nachgewiesen. In diesen
Simulationen wird eine Erfassung des Einflusses der Exzentrizität auf Bildmessung, Objekt-
und Kamerageometrie angestrebt. Im zweiten Schritt wird eine Realkalibrierung mit
vergleichbarer Aufnahmekonfiguration durchgefĂĽhrt. Dabei werden Gemeinsamkeiten bzw.
Unterschiede der erreichten Ergebnisse diskutiert sowie eine mögliche Kompensation des
Einflusses in der Praxis erörtert.


Relevance of ellipse eccentricity for camera calibration

2015

Kisser, W.,
Tietz, B.,
Boochs, F.,
PAULUS, D.

BibTex

Proc. SPIE 9528, Videometrics, Range Imaging, and Applications XIII, 95280D

Plane circular targets are widely used within calibrations of optical sensors through photogrammetric set-ups. Due to this popularity, their advantages and disadvantages are also well studied in the scientific community. One main disadvantage occurs when the projected target is not parallel to the image plane. In this geometric constellation, the target has an elliptic geometry with an offset between its geometric and its projected center. This difference is referred to as ellipse eccentricity and is a systematic error which, if not treated accordingly, has a negative impact on the overall achievable accuracy. The magnitude and direction of eccentricity errors are dependent on various factors. The most important one is the target size. The bigger an ellipse in the image is, the bigger the error will be. Although correction models dealing with eccentricity have been available for decades, it is mostly seen as a planning task in which the aim is to choose the target size small enough so that the resulting eccentricity error remains negligible. Besides the fact that advanced mathematical models are available and that the influence of this error on camera calibration results is still not completely investigated, there are various additional reasons why bigger targets can or should not be avoided. One of them is the growing image resolution as a by-product from advancements in the sensor development. Here, smaller pixels have a lower S/N ratio, necessitating more pixels to assure geometric quality. Another scenario might need bigger targets due to larger scale differences whereas distant targets should still contain enough information in the image. In general, bigger ellipses contain more contour pixels and therefore more information. This supports the target-detection algorithms to perform better even at non-optimal conditions such as data from sensors with a high noise level.

In contrast to rather simple measuring situations in a stereo or multi-image mode, the impact of ellipse eccentricity on image blocks cannot be modeled in a straight forward fashion. Instead, simulations can help make the impact visible, and to distinguish critical or less critical situations. In particular, this might be of importance for calibrations, as undetected influence on the results will affect further projects where the same camera will be used. This paper therefore aims to point out the influence of ellipse eccentricities on camera calibrations, by using two typical calibration bodies: planar and cube shaped calibration. In the first step, their relevance and influence on the image measurements, object- and camera geometry is shown with numeric examples. Differences and similarities between both calibration bodies are identified and discussed. In the second step, practical relevance of a correction is proven in a real calibration. Finally, a conclusion is drawn followed by recommendations to handle ellipse eccentricity in the practice.


3D-Messen groĂźer Volumen bzw. groĂźer Bauteile

2014

Berndt, D.,
Boochs, F.,
KĂĽhmstedt, P.

BibTex

Leitfaden zur optischen 3D-Messtechnik

GroĂźe Bauteile entstehen im Fahrzeugbau (PKWs und LKWs in der Automobilproduktion, Flugzeugrumpfschalen oder
Turbinenmodule im Flugzeugbau, Rahmen und Außenhaut an Schienenfahrzeugen), im Schiffbau, im Anlagenbau oder bei der Produktion von Energieerzeugungsanlagen (Windenergieanlagen, Großturbinen, usw.). An sie werden hohe Anforderungen hinsichtlich Maßhaltigkeit und Ausführungsqualität gestellt. Typische, sich daraus ergebene Messaufgaben sind das Prüfen geometrischer Merkmale in einem großen Messvolumen (z. B. Maß- und Formabweichungen über mehrere Meter) sowie das dimensionelle Erfassen einer lokalen Bauteilgeometrie oder das Prüfen eines lokalen Montagezustands in einem global registrierten Bauteilkoordinatensystem.
Dazu kommen Sensoren zum Einsatz, die nur in einem lokal begrenzten Messvolumen, typischerweise kleiner 1m, Bild und
Geometrieinformationen erfassen können. Da die Abmessungen der Großbauteile mehrere Meter bis mehrere zehn Meter
betragen, mĂĽssen die lokal erfassten PrĂĽfmerkmale fĂĽr die sich anschlieĂźende Auswertung in ein globales Koordinatensystem, ĂĽblicherweise das Bauteilkoordinatensystem, transformiert werden.
 


Modular method of detection, localization, and counting of multiple-taxon pollen apertures using bag-of-words

2014

Lozano-Vega, G.,
Benezeth, Y.,
Marzani, F.,
Boochs, F.

BibTex

Journal of Electronic Imaging

Abstract.  Accurate recognition of airborne pollen taxa is crucial for understanding and treating allergic diseases which affect an important proportion of the world population. Modern computer vision techniques enable the detection of discriminant characteristics. Apertures are among the important characteristics which have not been adequately explored until now. A flexible method of detection, localization, and counting of apertures of different pollen taxa with varying appearances is proposed. Aperture description is based on primitive images following the bag-of-words strategy. A confidence map is estimated based on the classification of sampled regions. The method is designed to be extended modularly to new aperture types employing the same algorithm by building individual classifiers. The method was evaluated on the top five allergenic pollen taxa in Germany, and its robustness to unseen particles was verified.


Analysis of Relevant Features for Pollen Classification

2014

Lozano-Vega, G.,
Benezeth, Y.,
Marzani, F.,
Boochs, F.,
Iliadis, L.,
Maglogiannis, I.,
Papadopoulos, H.

BibTex

Artificial Intelligence Applications and Innovations

Towards a knowledge model bridging technologies and applications in cultural heritage documentation

2014

Boochs, F.,
Trémeau, A.,
Murphy, O.,
Gerke, M.,
Lerma, J.L.,
Karmacharya, A.,
Karaszewski, M.

BibTex

ISPRS Technical Commission V Symposium

This paper documents the formulation of an international, interdisciplinary study, on a concerted European level, to prepare an innovative, reliable, independent and global knowledge base facilitating the use of today’s and future optical measuring techniques for the documentation of  cultural heritage. Cultural heritage professionals, color engineers and scientists share similar goals for the documentation, curation, long-term preservation and representation of cultural heritage artifacts. Their focus is on accuracy in the digital capture and remediation of artefacts through a range of temporal, spatial and technical constraints. A shared vocabulary to interrogate these shared concerns will transform mutual understanding and facilitate an agreed movement forward in cultural heritage documentation here proposed in the work of the COST Action Color and Space in Cultural Heritage (COSCH). The goal is a model that captures the shared concerns of professionals for a standards-based solution with an organic Linked Data model. The knowledge representation proposed here invokes a GUI interface for non-expert users of capture technologies, facilitates, and formulates their engagement with key questions for the field.


Colour and Space in Cultural Heritage: Key Questions in 3D Optical Documentation of Material Culture for Conservation

2014

Boochs, F.,
A., B.K.,
Ch., D.,
M., K.,
A., K.,
Z., K.,
M., P.,
R., S.,
A., T.,
D., T.,
L., T.

BibTex

5th International Conference, EuroMed 2014, Limassol, Cyprus, November 3-8

The paper introduces some key interdisciplinary questions concerning the development of optical measuring techniques and electronic imaging applied to documentation and presentation of artefacts, as identified through the work of Colour and Space in Cultural Heritage (www.COSCH.info), a trans-domain European Action (TD1201) in the area of Materials, Physics and Nanosciences (MPNS) supported, since 2013, by the European Cooperation in Science and Technology http://www.cost.eu/domains_actions/mpns/Actions/ TD1201. Some 125 international researchers and professionals participate in COSCH activities which have been organised around six main subjects: (1) spectral object documentation; (2) spatial object documentation; (3) algorithms and procedures; (4) analysis and restoration of cultural heritage surfaces and objects; (5) visualisation of cultural heritage objects and its dissemination; and (6) the semantic development of the COSCH Knowledge Representation.

The Authors outline and illustrate the approaches adopted by COSCH. They indicate future work that is needed to resolve the identified scientific, technical and semantic questions, as well as challenges of interdisciplinary communication, to ensure a wider adoption of specialist technologies and enhanced standards in 3D documentation of material cultural heritage — being a basis for its understanding, conservation, restoration, long-term preservation, study, presentation and wide dissemination.

 


Characterisation of Spatial Techniques for Optimised Use in Cultural Heritage Documentation.

2014

Wefers, S.,
Karmacharya, A.,
Boochs, F.,
Wiemann, A.K.

BibTex

Digital Heritage Progress in Cultural Heritage: Documentation, Preservation, and Protection. 5th International Conference, EuroMed 2014 Limassol, Cyprus, November 3-8, 2014 Proceedings

Constant technological progress results in new possibilities to produce reliable and rich spatial data of cultural heritage objects. In order to make optimal use of these capabilities, it is important to identify and name the information required to best serve the reasoning processes in these application fields. Correspondingly it is necessary to know about the characteristics of digitization techniques producing the content adapted to the needs of the applications. Due to the considerable complexity of instruments and processes producing the data, it is helpful to have a clear structure which relates the capabilities of the instruments to the requirements of the applications. This paper addresses this topic and shows a way of structuring spatial techniques as well as how this structure can be related to applications in the field of cultural heritage.


Registrierung von 3D Punktwolken via 2D Korrespondenz fĂĽr ein kombiniertes Messsystem

2014

Burger, M.,
Polat, S.,
Tietz, B.,
Boochs, F.

PDF / BibTex

Oldenburger 3D-Tage

Ein Messsystem, bestehend aus einem 3D-Sensor (z.B. TOF) und einem höher auflösenden 2D-Sensor (RGB- oder Monochromkamera) kombiniert die Echtzeiterfassung von 3D-Geometrien mit der hohen Informationsdichte der Oberflächentextur. Dabei stehen beide Sensoren in einer festen relativen Beziehung zueinander, die sich über Standardmethoden der Photogrammetrie bestimmen lässt. Sie bildet die Grundlage für die rechnerische Übertragung von 2D-Tracking und Merkmalsextraktion auf die 3D-Geometrie. Ziel ist, in Echtzeit, bei sequenzieller 3D-Aufnahme, ein homogenes und rauschreduziertes dreidimensionales Gesamtmodell zu generieren.

Hohes Rauschen, nicht modellierte Systematiken und frequente Messausfälle verhindern das Funktionieren etablierter Registrierverfahren. Diese, nur auf 3D-Daten basierende Verfahren, berechnen eine Grobregistrierung über homologe 3D-Merkmalspunkte und eine Feinregistrierung über ICP. Im Rahmen der hier vorgestellten Lösung wurden Maßnahmen zur Rauschkompensation und Steigerung der Robustheit konzipiert und entwickelt. Die Registrierung wird aus 2D-Korrespondenzen geschätzt. Dazu werden über Merkmalsoperatoren bestimmte homologe Bildpunkte durch die relative Orientierung mit repräsentativen 3D-Punkten in Verbindung gebracht. Aus den repräsentativen 3D-Punkten wird eine räumliche Transformation geschätzt. Da mit einer Vielzahl von korrespondierenden Punkten geschätzt wird, sind Rauschen und Punktausfälle weniger problematisch. Die Gesamtregistrierung wird zur Steigerung der Robustheit und Genauigkeit über korrespondierende Ebenen vorgenommen. Dazu werden Ebenen im 3D mit einem eigens entwickelten Segmentierungsalgorithmus ermittelt und die Korrespondenz über Ebenen- und Punkthaufenähnlichkeit hergestellt. Die Ebenenregistrierung ist ein flächenbasierter Ansatz, dessen Zuverlässigkeit grundsätzlich gegenüber punktbasierten Ansätzen nicht von Punktvarianz beeinträchtigt wird.


i3mainz - Jahresbericht 2013

2014

Boochs, F.,
Bruhn, N.,
Wachter, J.

PDF / BibTex

n.A.

Innovative concepts for image based data capture and analysis of huge point clouds

2014

Boochs, F.

BibTex

n.A.

Results from two sample projects will be presented, showing possibilities to improve quality and precision of data capture and evaluation.

One example explains the potential to improve the absolute positional accuracy of a robot guided effector when applying photogrammetric strategies. Need and aims of such a tracking process are explained, followed by a description of actual solutions and their restrictions. Then the potential of photogrammetric solutions for such purposes are outlined, followed by a detailed description of the system developed. Finally, practical tests are shown, underlining that the design and realization are able to hold the challenging aims and improve the absolute accuracy of a robot by a factor of 20.

In an second example possibilities to evaluate huge data sets are presented. Due to the increasing availability of large unstructured point clouds obtained from laser scanning and/or photogrammetric data, there is a growing demand for automatic processing methods. Given the complexity of the underlying problems, several new methods resort to using semantic knowledge in particular for supporting object detection and classification. A novel approach making use of advanced algorithms is shown, in order to benefit from intelligent knowledge management strategies for the processing of 3D point clouds along with object classification in scanned scenes. In particular, these method extends the use of semantic knowledge to all stages of the processing, including the guidance of the 3D processing algorithms. The complete solution consists in a multi-stage iterative concept based on three factors: the modeled knowledge, the package of algorithms, and the classification engine.


COSCH knowledge schema – an introduction

2014

Boochs, F.

BibTex

n.A.

Classification of Pollen Apertures Using Bag of Words

2013

Lozano-Vega, G.,
Benezeth, Y.,
Marzani, F.,
Boochs, F.,
Petrosino, A.

BibTex

Image Analysis and Processing – ICIAP 2013

Automatic Detection and Classification of Objects in Point Clouds using multi-stage Semantics

2013

Truong, H.Q.,
Ben Hmida, H.,
Boochs, F.,
Habed, A.,
Cruz, C.,
Voisin, Y.,
Cruz, N.C.

PDF / BibTex

Journal of photogrammetry, remote sensing and geoinformation processing

Due to the increasing availability of large unstructured point clouds obtained from laser scanning and/or photogrammetric data, there is a growing demand for automatic processing methods. Given the complexity of the underlying problems, several new methods try to using semantic knowledge in particular for supporting object detection and classification. In this paper, we present a novel approach which makes use of advanced algorithms to benefit from intelligent knowledge management strategies for the processing of 3D point clouds and for object classification in scanned scenes. In particular, our method extends the use of semantic knowledge to all stages of the processing, including the guidance of the 3D processing algorithms. The complete solution consists in a multi-stage iterative concept based on three factors: the modelled knowledge, the package of algorithms, and the classification engine. Two case studies illustrating our approach are presented in this paper. The studies were carried out on scans of the waiting area of an airport and along the tracks of a railway. In both cases the goal was to detect and identify objects within a defined area. With our results we demonstrate the applicability of our approach.

 

Automatische Detektion und Klassifikation von Objekten in Punktwolken unter Nutzung mehrschichtiger Semantik. Infolge der zunehmenden Verfügbarkeit großer unstrukturierter Punktwolken aus Laserscanning und Photogrammetrie entsteht wachsender Bedarf für automatisierte Auswerteverfahren. Angesichts der häufig hohen Komplexität der in den Punktwolken enthaltenen Objekte stoßen rein datengetriebene Ansätze an ihre Grenzen. Es entstehen vermehrt Konzepte, die auf verschiedene Weise auch Gebrauch von der Semantik machen. Semantik und Algorithmik sind dabei oft eng miteinander verwoben und führen zu Limitationen in Art und Umfang der nutzbaren Semantik. Mit der vorgestellten Lösung werden Algorithmik und Semantik klar getrennt und mit den exakt auf diese Domänen zugeschnittenen Werkzeugen behandelt. Deren prozedurale Verknüpfung führt dann zu einem neuen Verarbeitungskonzept, das eine nach unserem Kenntnisstand bislang nicht erreichte Flexibilität und Vielseitigkeit in der Nutzung unterschiedlichster Semantiken besitzt und auch die Steuerung der Algorithmen integriert. Die iterative Gesamtlösung fußt auf drei Säulen, nämlich dem modellierten Wissen, dem Pool der Algorithmen und dem Identifikationsprozess. Erreichbare Resultate werden an zwei Beispielen dokumentiert. Ein Beispiel befasst sich mit der Analyse von Punktwolken aus dem Bereich der Lichtraumvermessung an Bahntrassen, das zweite mit Räumlichkeiten in einem Flughafen. In beiden Fällen müssen bestimmte Objektarten aufgefunden und klassifiziert werden.


Automatic object detection in point clouds based on knowledge guided algorithms

2013

Truong, H.Q.,
Karmacharya, A.,
Kisser, W.,
Boochs, F.,
Chudyk, C.,
Habed, A.,
Voisin, Y.

BibTex

SPIE Optical Metrology, International Society for Optics and Photonics, 2013

The modeling of real-world scenarios through capturing 3D digital data has been proven applicable in a variety of industrial applications, ranging from security, to robotics and to fields in the medical sciences. These different scenarios, along with variable conditions, present a challenge in discovering flexible appropriate solutions. In this paper, we present a novel approach based on a human cognition model to guide processing. Our method turns traditional data-driven processing into a new strategy based on a semantic knowledge system. Robust and adaptive methods for object extraction and identification are modeled in a knowledge domain, which has been created by purely numerical strategies. The goal of the present work is to select and guide algorithms following adaptive and intelligent manners for detecting objects in point clouds. Results show that our approach succeeded in identifying the objects of interest while using various data types.


Semantics – Supportive Element for the Cooperative Evaluation of Geographical and Historical Information

2013

Karmacharya, A.,
Kohr, T.,
Boochs, F.,
Bruhn, K.C.,
Cruz, C.

BibTex

zfv - Zeitschrift für Geodäsie, Geoinformation und Landmanagement

The emergence of the Semantic Web and its underlying knowledge technologies has brought changes in data handling. Transferring expert knowledge to machines through knowledge formalization provides us the required support in managing huge datasets like the information in the World Wide Web. In the field of geospatial technology semantic technologies not only entail the capability to achieve higher degree of data integration but also infer semantics to discover new and hidden knowledge. This is of particular interest in the field of archaeology, where complex interrelations among heterogeneous datasets exist. Although researches on semantics are active areas in geospatial communities, their initial use is mainly for spatial data integration. This article tries to go one step further and imply semantics for spatial knowledge discovery through spatial built-ins within SWRL and SPARQL. The work resembles the approach of the Open Geospatial Consortium (OGC) to define standards for ­GeoSPARQL.


Sketch of an Automatic Image Based Pollen Detection System

2013

Lozano-Vega, G.,
Benezeth, Y.,
Uhler, M.,
Boochs, F.,
Marzani, F.

PDF / BibTex

32. Wissenschaftlich-Technische Jahrestagung der DGPF
We present the sketch of an automatic alternative method for identi-fying and quantifying airborne pollen grains under the framework of a project called Personalized Pollen Profiling and Geospatial Mapping. The first stage of the detection system locates and segments potential pollen particles while re-ducing the dataset size for convenient handling and storing. In the second stage, the proposed classification scheme successively tests different pollen character-istics until the taxon is uniquely identified. Morphological and optical proper-ties of the pollen and image local features are selected based on the study of strengths and weaknesses of the state-of-the-art methods. This scheme allows the system to compute suitable feature vectors to discriminate similar taxa only when necessary, reducing the computational cost.

A knowledge-based approach to the automatic algorithm selection for 3D scene annotation

2012

Truong, H.Q.,
Boochs, F.,
Habed, A.,
Voisin, Y.

BibTex

11th International Conference on Information Science, Signal Processing and their Applications (ISSPA) IEEE

In this paper we present a novel approach for 3D point cloud processing with the aim of annotating objects in a scanned scene. Our method is based on human cognition to guide the 3D processing algorithms and uses semantic knowledge to manage data and identify immediate situation-dependent objectives. In particular, we have built a system that allows an automatic and flexible selection of algorithms. The selection strategy exploits knowledge to identify the geometrical features to be detected as well as the objects to be annotated at each stage of the 3D processing of the point cloud.


i3mainz - Jahresbericht 2012

2012

Boochs, F.,
Gundlach, A.,
Wachter, J.

PDF / BibTex

i3mainz - Jahresbericht
Derzeit sind neben neun Professoren am Institut mehr als zwanzig wissenschaftliche Mitarbeiterinnen und Mitarbeiter mit Zeitverträgen angestellt. Neben ihnen sind Studierende mit ihren Abschlussarbeiten, Praktikanten und studentische Mitarbeiterinnen und Mitarbeiter in die Arbeit des Instituts eingebunden.
Im Jahr 2012 standen Mittel im Gesamtumfang von 1,28 Mio Euro zur Verfügung. Dazu zählten Mittel der FH Mainz, des Landes, öffentlicher Förderprogramme, der Europäischen Union und Drittmittel aus der Wirtschaft. 

From Unstructured 3D Point Clouds to Structured Knowledge - A Semantics Approach

2012

Boochs, F.,
Ben Hmida, H.,
Cruz, C.,
Nicolle, C.,
Afzal, M.T.

PDF / BibTex

Semantics - Advances in Theories and Mathematical Models

Over the last few years, formal ontologies has been suggested as a solution for several engineer problems, since it can efficiently replace standard data bases and relational one with more flexibility and reliability. In fact, well designed ontologies own lots of positive aspects, like those related to defining a controlled vocabulary of terms, inheriting and extending existing terms, declaring a relationship between terms, and inferring relationships by reasoning on existent ones. Ontologies are used to represent formally the knowledge of a domain where the basic idea was to present knowledge using graphs and logical structure to make computers able to understand and process it, (Boochs, et al., 2011). As most recent works, the tendency related to the use of semantic has been explored, (Ben Hmida, et al., 2010) (Hajian, et al., 2009) (Whiting, 2006) where the automatic data extraction from 3D point clouds presents one of the new challenges, especially for map updating, passenger safety and security improvements. However such domain is characterized by a specific vocabulary containing different type of object. In fact, the assumption that knowledge will help the improvement of the automation, the accuracy and the result quality is shared by specialists of the point cloud processing.


Spatialization of the Semantic Web

2012

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Afzal, M.T.

PDF / BibTex

Advances in Theories and Mathematical Models

The abstraction of the real world melds the semantics of its objects with the spatial characteristics seamlessly. This is visible in a way the human perceives the real world where it is often difficult to pin point the spatial characteristics of the objects from their semantics. In other words the spatial characteristics are generally hidden with the semantics of the objects. As for example, describing relations of objects the terms near, far or touching are often used which are spatial relations but in general considered as semantic properties which is not true. Hence, it is a trend to consider that the spatial behaviors of objects are parts of its semantics. Similar approaches where the spatial properties are considered as part of semantics have been translated in technical advancements made by the technologies. There is a general trend to mix up spatial components in the semantics or the semantics in the spatial components within technologies. For instance, a classic GIS ignores semantics of objects to focus on the spatial components whereas a non GIS uses spatial components as the semantic parameters of the objects. As the technology is getting matured, it is moving closer to the human perception of the real world. Today, the knowledge management is being researched in real sense to model and to manage knowledge possessed by humans which is basically the perception of the real world.


Asserting the Precise Position of 3D and Multispectral Acquistion Systems for Multisensor Registration Applied to Cultural Heritage Analysis

2011

Boochs, F.,
SchĂĽtze, R.,
Simon, C.,
F., M.A.R.Z.A.N.I.

PDF / BibTex

Advances in Multimedia Modeling

We present a novel method to register multispectral acquisitions on a 3D model. The method is based on the external tracking of the acquisition systems using close-range photogrammetric techniques: multiple calibrated cameras simultaneously observe the successive acquisition systems in use. The views from these cameras are used to precisely determine the position of each acquisition system. All datasets can then be projected in the same coordinate system. The registration is thus independent from the quality and content of the data. This method is well suited to the study of cultural heritage or any other application where we do not wish to place targets on the object. We describe the method and the simulation pipeline used to find an adequate setup for two case studies.


i3mainz - Jahresbericht 2011

2011

Boochs, F.,
Böhm, K.,
Bruhn, K.C.,
Kern, F.,
Klinge, K.A.,
Klonowski, J.,
MĂĽller, H.

PDF / BibTex

i3mainz - Jahresbericht
Angewandte Forschung, Entwicklung und Technologietransfer im fachlichen Umfeld der Geoinformatik und Vermessung sind die Arbeitsschwerpunkte im Institut. Moderne Verfahren der Messtechnik für die Gewinnung raumbezogener Daten und die Technologien zu deren Weiterverarbeitung, Analyse und Visualisierung stellen dabei die wichtigsten Werkzeuge dar.
 
Im Jahr 2011 standen Mittel im Gesamtumfang von ca. € 1.090.000 zur Verfügung, womit das Institut erneut die Schwelle von 1 Mio. EUR überschreiten konnte. Diese Mittel wurden vor allem zur Bezahlung des Personals verwendet. Der größte Anteil (59%) sind Drittmittel, 20% stammen vom Ministerium für Bildung, Wissenschaft Jugend und Kultur Rheinland-Pfalz und weitere 21% aus dem Haushalt der Fachhochschule Mainz.

3D-Sutra - Interactive Analysis Tool for a Web Atlas of Scanned Sutra Inscriptions in China

2011

Boochs, F.,
Schmidt, N.,
SchĂĽtze, R.

BibTex

The Photogrammetric Record

Buddhist stone inscriptions of the 8th to 12th centuries ad are important cultural assets of China that need to be documented, analysed and interpreted archaeologically, art-historically and linguistically. On the one hand, such Buddhist stone inscriptions have to be conserved for future generations, but on the other hand, further possibilities for analysing the data could be achieved if the inscriptions were made accessible to a wider community, for instance, for understanding of the historical growth of Buddhism in China. In this paper, innovative techniques for the documentation of stone inscriptions located in the province of Sichuan, in the south-west of China, are demonstrated. The tasks to be performed include capturing the stone inscriptions by using high precision measuring techniques to generate copies of the original inscriptions, together with processing of the data enabling improvement in the legibility of characters and thus aiding the interpretation of the inscriptions. The concept and features of image processing as applied to the captured inscriptions are outlined. In order to present the outcome to as many people as possible and to allow individual interpretations of the results of the stone inscription reconstruction, their current interpretation and additional 2D/3D maps are published within an interactive web platform.


3D-Sutren - Webbasiertes Informationssystem gescannter Sutrentexte in China

2011

Boochs, F.,
Schmidt, N.,
SchĂĽtze, R.,
Luhmann, T.,
MĂĽller, C.

PDF / BibTex

Photogrammetrie, Laserscanning, Optische 3D-Messtechnik

Die buddhistische Steinschriften (8. - 12. Jh. n. Chr.) der Provinz Sichuan im Südwesten Chinas repräsentieren eines der bedeutendsten Kulturgüter Chinas, welche archäologisch, kunsthistorisch und textwissenschaftlich dokumentiert, analysiert, interpretiert und visuali-siert werden müssen. Einerseits sollen diese buddhistischen Steinschriften für zukünftige Generationen konserviert werden. Andererseits sollen weitere Voraussetzungen zur Analy-se der Daten geschaffen werden, indem diese einer breiten Öffentlichkeit zugänglich ge-macht werden, um beispielsweise die geschichtliche Entwicklung des Buddhismus in China und seine Anpassung an die chinesische Kultur zu erforschen.


Integration of knowledge to support automatic object reconstruction from images and 3D data

2011

Boochs, F.,
Ben Hmida, H.,
Karmacharya, A.,
Marbs, A.,
Truong, H.Q.,
Cruz, C.,
Nicolle, C.,
Habed, A. : V.

PDF / BibTex

Eighth International Conference on Systems, Signals and Devices (SSD) 2011

Object reconstruction is an important task in many fields of application as it allows to generate digital representations of our physical world used as base for analysis, planning, construction, visualization or other aims. A reconstruction itself normally is based on reliable data (images, 3D point clouds for example) expressing the object in his complete extent. This data then has to be compiled and analyzed in order to extract all necessary geometrical elements, which represent the object and form a digital copy of it. Traditional strategies are largely based on manual interaction and interpretation, because with increasing complexity of objects human understanding is inevitable to achieve acceptable and reliable results. But human interaction is time consuming and expensive, why many researches has already been invested to use algorithmic support, what allows to speed up the process and to reduce manual work load.

Presently most of such supporting algorithms are datadriven and concentrate on specific features of the objects, being accessible to numerical models. By means of these models, which normally will represent geometrical (flatness, roughness, for example) or physical features (color, texture), the data is classified and analyzed. This is successful for objects with low complexity, but gets to its limits with increasing complexness of objects. Then purely numerical strategies are not able to sufficiently model the reality.

Therefore, the intention of our approach is to take human cognitive strategy as an example, and to simulate extraction processes based on available human defined knowledge for the objects of interest. Such processes will introduce a semantic structure for the objects and guide the algorithms used to detect and recognize objects, which will yield a higher effectiveness. Hence, our
research proposes an approach using knowledge to guide the algorithms in 3D point cloud and image processing.


Werkzeuge zur Handhabung von Semantik

2011

Karmacharya, A.,
Cruz, C.,
Boochs, F.,
Pryzibilla, H.J.

BibTex

Aspekte eines räumlichen Informationssystems für die Industriearchäologie; Ergebnisse eines BMBF-Forschungsprojektes

Toward the automatic generation of semantic VRML model from unorganized 3D point clouds

2011

Boochs, F.,
Ben Hmida, H.,
Cruz, N.C.

PDF / BibTex

SEMAPRO 2011 - The Fifth International Conference on Advances in Semantic Processing

This paper presents our experience regarding the creation of 3D semantic facility model out of unorganized 3D point clouds. Thus, a knowledge-based detection approach of objects using the OWL ontology language is presented. This knowledge is used to define SWRL detection rules. In addition, the combination of 3D processing built-ins and topological Built-Ins in SWRL rules aims at combining geometrical analysis of 3D point clouds and specialist’s knowledge. This combination allows more flexible and intelligent detection and the annotation of objects contained in 3D point clouds. The created WiDOP prototype takes a set of 3D point clouds as input, and produces an indexed scene of colored objects visualized within VRML language as output. The context of the study is the detection of railway objects materialized within the Deutsche Bahn scene such as signals, technical cupboards, electric poles, etc. Therefore, the resulting enriched and populated domain ontology, that contains the annotations of objects in the point clouds, is used to feed a GIS system.


Nutzung hybrider Messdaten

2011

Schilling, K.,
Boochs, F.,
Pryzibilla, H.J.

PDF / BibTex

Aspekte eines räumlichen Informationssystems für die Industriearchäologie; Ergebnisse eines BMBF-Forschungsprojektes

Sowohl die Photogrammetrie als auch das terrestrische Laserscanning eignen sich zur Aufnahme und Dokumentation archäologischer Strukturen. Da sich ihre charakteristischen Eigenschaften komplementär ergänzen, kann durch die simultane Verwendung beider Verfahren und die Verknüpfung der verschiedenartigen Informationen die Datengrundlage für das zu dokumentierende Objekt erweitert werden. Die hierzu notwendigen Arbeitsschritte sowie Beispiele für die gemeinsame Datennutzung sollen in diesem Beitrag thematisiert werden.


Low Cost 3D Urban Scene Reconstruction By Fusing 3D Data And 2D Optical Data

2011

Boochs, F.,
Grati, N.,
Kallel, I.,
Masmoudi, D.

PDF / BibTex

Proceedings LC3D Workshop

3D objects modelling from 2D images is a major task in many application fields including robotics, virtual and augmented reality, and entertainment. According to the equipment used to acquire and process data, a reconstruction process can be based on laser or optical scanners or on digital images. Laser scanner provides a highly detailed and accurate representation of even complex surface shapes but generally, they are expensive, the data processing consumes much time and requires expert interaction with the machine. On the other hand, image based multi-view stereovision techniques provide nowadays an exciting alternative for 3D scene reconstruction because images can be easily obtained. Given a set of 2D images, we propose a novel approach for 3D urban scene reconstruction with low cost by extending unstructured spatial data normally generated by stereovision approaches by linear structures found in the same images. Our suggested system try to resolve two proposed issues: (1) The generation of dense 3D point clouds from 2D images (2) The integration of the available structured 2D data for the improvement of the detection/reconstruction of urban structures.


Konzeptioneller Ansatz eines räumlichen Informationssystems für die Industriearchäologie

2011

Boochs, F.

BibTex

Ergebnisse eines BMBF-Forschungsprojektes

Knowledge Base Approach for 3D Objects Detection in Point Clouds Using 3D Processing and Specialists Knowledge

2011

Boochs, F.,
Ben Hmida, H.,
Cruz, N.C.

PDF / BibTex

International Journal on Advances in Intelligent Systems

This paper presents a knowledge-based detection of objects approach using the OWL ontology language, the Semantic Web Rule Language, and 3D processing built-ins aiming at combining geometrical analysis of 3D point clouds and specialist’s knowledge. Here, we share our experience regarding the creation of 3D semantic facility model out of unorganized 3D point clouds. Thus, a knowledge-based detection approach of objects using the OWL ontology language is presented. This knowledge is used to define SWRL detection rules. In addition, the combination of 3D processing built-ins and topological Built-Ins in SWRL rules will allows more flexible and intelligent detection, and the annotation of objects contained in 3D point clouds. The created WiDOP prototype takes a set of 3D point clouds as input, and produces as output a populated ontology corresponding to an indexed scene visualized within VRML language. The context of the study is the detection of railway objects materialized within the Deutsche Bahn scene such as signals, technical cupboards, electric poles, etc. Thus, the resulting enriched and populated ontology, that contains the annotations of objects in the point clouds, is used to feed a GIS system or an IFC file for architecture purposes.


Integration of Spatial Processing and Knowledge Processing through the Semantic Web Stack

2011

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

4th International Conference on GeoSpatial Semantics, Eds. Christophe Claramunt, Sergei Levashkin, Michela Bertlotto

From unstructured 3D Point Clouds to Structured Knowledge - A semantics Approach

2011

Boochs, F.,
Ben Hmida, H.,
Cruz, C.,
Nicolle, C.

BibTex

Semantics

FROM 3D POINT CLOUDS TO SEMANTIC OBJECTS An Ontology-Based Detection Approach

2011

Boochs, F.,
Ben Hmida, H.,
Cruz, N.C.

PDF / BibTex

Keod 2011 - International Conference on Knowledge Engineering and Ontology Development

This paper presents a knowledge-based detection of objects approach using the OWL ontology language, the Semantic Web Rule Language, and 3D processing built-ins aiming at combining geometrical analysis of 3D point clouds and specialist’s knowledge. This combination allows the detection and the annotation of objects contained in point clouds. The context of the study is the detection of railway objects such as signals, technical cupboards, electric poles, etc. Thus, the resulting enriched and populated ontology, that contains the annotations of objects in the point clouds, is used to feed a GIS systems or an IFC file for architecture purposes.


Einsatz künstlicher Passkörper zur Registrierung von Scandaten sowie zur Fusion von Bild- und Scandaten

2011

Boochs, F.,
Schilling, K.

PDF / BibTex

31. Wissenschaftlich-Technische Jahrestagung der DGPF

Bild- und Scandaten verfügen über komplementäre Eigenschaften, sodass ihre Fusion einen Informationsgewinn verspricht. Ihre gemeinsame Nutzung erfordert jedoch die Herstellung einer Korrespondenz zwischen den heterogenen Datentypen. Diese lässt sich mit natürlichen Objektinformationen nur schwer realisieren, insbesondere wenn die relative Orientierung von Kamera und Scanner unbekannt ist. Zur Verknüpfung der Bild- und Scandaten sowie zur Registrierung der Scandaten sollen deshalb spezielle Passkörper zum Einsatz kommen.


ArcheoKM ein räumliche Informationssystem für die Industriearchäologie

2011

Karmacharya, A.,
Boochs, F.,
Pryzibilla, H.J.

BibTex

Aspekte eines räumlichen Informationssystems für die Industriearchäologie; Ergebnisse eines BMBF-Forschungsprojektes

Aspekte eines räumlichen Informationssystems für die Industriearchäologie

2011

Boochs, F.,
Pryzibilla, H.J.

BibTex

Ergebnisse eines BMBF-Forschungsprojektes

i3mainz - Jahresbericht 2010

2010

Boochs, F.,
Böhm, K.,
Bruhn, K.C.,
Kern, F.,
Klinge, K.A.,
Klonowski, J.,
MĂĽller, H.,
Neitzel, F.,
SchlĂĽter, M.

PDF / BibTex

i3mainz - Jahresbericht

Schwerpunkt der Institutsaktivitäten sind angewandte Forschung, Entwicklung und Technologietransfer im fachlichen Umfeld der Geoinformatik und Vermessung. Dabei kommen im Allgemeinen moderne Verfahren der Messtechnik für die Gewinnung raumbezogener Daten zum Einsatz, deren Weiterverarbeitung, Analyse und Visualisierung sich mittels aktuellen Methoden der Informationstechnik anschließt.

 

 


3D-Sutra - Interactive Analysis Tool For A Web- Atlas Of Scanned Sutra Inscriptions In China

2010

Boochs, F.,
Schmidt, N.,
SchĂĽtze, R.

PDF / BibTex

ISPRS, Commission V Symposium - 'Close Range Image Measurement Techniques'

Buddhistic stone inscriptions (8th-12th centuries) are important cultural assets of China which need to be documented, analyzed, interpreted and visualized archaeologically, art-historically and text-scientifically. On one hand such buddhistic stone inscriptions have to be conserved for future generations but on the other hand further possibilities for analyzing the data could be enabled when the inscriptions would be accessible to a larger community, for instance the understanding of the historical growth of Buddhism in China could In this article we show innovative techniques for the documentation of stone inscriptions located in the province of Sichuan - southwest of china. The tasks to be performed comprise capturing of stone inscriptions by using high precision measuring techniques to generate copies of the original inscriptions and the processing of the data enabling the improvement of the legibility of characters and thus supporting the interpretation of the inscriptions. We show the concept and features of the image processing applied on the captured inscription. In order to present the outcome to a large community and to allow individual interpretations, the results of the stone inscription reconstruction, the interpretation and additional 2D / 3D maps are published within an interactive web platform.


Capture and Processing of High Resolution 3D-Data of Sutra Inscriptions in China

2010

Boochs, F.,
Schmidt, N.,
SchĂĽtze, R.

BibTex

Digital Heritage

Integration of knowledge into the detection of objects in point clouds

2010

Boochs, F.,
Ben Hmida, H.,
Marbs, A.,
Truong, H.Q.

PDF / BibTex

Proceedings of ISPRS Commission III Symposium - PCV 2010,

The reconstruction of 3D objects from point clouds and images is a major task in many application fields. The processing of such spatial data, especially 3D point clouds from terrestrial laser scanners, generally consumes time and requires extensive interaction between a human and the machine to yield a promising result. Presently, algorithms for an automatic processing are usually datadriven and concentrate on geometric feature extraction. Robust and quick methods for complete object extraction or identification are still an ongoing research topic and suffer from the complex structure of the data, which cannot be sufficiently modelled by purely numerical strategies. Therefore, the intention of our approach is to take human cognitive strategy as an example, and to simulate these processes based on available knowledge for the objects of interest. Such processes will first, introduce a semantic structure for the objects and second, guide the algorithms used to detect and recognize objects, which will yield a higher effectiveness. Hence, our research proposes an approach using knowledge to guide the algorithms in 3D point cloud and image processing.


Wissensbasierte Objekterkennung in 3D-Punktwolken und Bildern

2010

Boochs, F.,
Ben Hmida, H.,
Marbs, A.,
Truong, H.Q.

PDF / BibTex

30. Wissenschaftlich-Technische Jahrestagung der DGPF 2010 - 3-Ländertagung

Konventionelle Algorithmen zur Erkennung von Objekten in Punktwolken sind bisher vor allem von manueller Interaktion mit entsprechend hohem zeitlichem Aufwand geprägt und aus wirtschaftlicher Sicht damit oftmals ineffizient. Ansätze für eine Automatisierung der Modellbildung verfolgen bislang überwiegend daten-getriebene Konzepte und sind angesichts der Komplexität der Objekte und des enormen Informationsgehaltes von Punktwolken in ihrem Leistungsvermögen begrenzt und nur von geringer praktischer Relevanz. Die Autoren haben sich daher mit diesem Vorhaben zum Ziel gesetzt, effiziente, intelligente Methoden für eine automatisierte Auswertung von terrestrischen Laserscannerdaten zu entwickeln. Im Gegensatz zu den bisherigen Ansätzen wird hier das Ziel verfolgt, bereits vorhandenes Wissen über die zu vermessenden Objekte in die Auswertung einfließen zu lassen. Dieses Vorwissen kann beispielsweise in Datenbanken, Bestands- oder Bauplänen enthalten sein und gestattet somit eine gezielte, objektorientierte Detektion, Identifizierung und gegebenenfalls Modellierung von komplexen Geometrien und Objekten. Von entscheidender Bedeutung ist dabei die Abbildung und Formalisierung des Wissens, damit es zur Unterstützung der Punktwolkenverarbeitung taugt. Im nachfolgenden Beitrag sollen erste Konzeptideen und Lösungsansätze des erst kürzlich gestarteten Forschungsvorhabens präsentiert werden. Die angestrebte Lösung wird ontologie-basiert sein und sich damit an den Konzepten des „Semantic Web“ orientieren. Dies soll es gestatten, bereits vorhandene und noch zu entwickelnde nummerische Verfahren gezielt zur Erkennung von Objekten in Punktwolken und ggf. orientierten Bildern zu steuern und damit eine automatisierte, intelligente, dem jeweiligen Objekt angepasste Algorithmik zu ermöglichen. Die zu entwickelnden Verfahren werden zunächst anhand der Anforderungen in den Anwendungsbereichen des Facility Managements und der Bahnvermessung entwickelt und erprobt, sollen aber zukünftig universal auch in anderen Gebieten einsetzbar sein.


Use of Geospatial Analyses for Semantic Reasoning

2010

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

14th International Conference on Knowledge-Based and Intelligent Information & Engineering Systems KES 2010

Spatial Rules Through Spatial Rule Built-Ins in SWRL

2010

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

Journal of Global Research in Computer Science

The paper presents a method to include spatial rule within rule languages like SWRL to infer spatial rules within semantic web framework. The concept presented here could benefit both geospatial community as they benefit using the adjusted knowledge base to infer spatial rule and semantic web community as the inclusion of spatial data in its framework adds value to the technology. The methods presented here is suitable to be implemented in other tools and techniques within semantic web technology.


Semantic-based Technique for the Automation the 3D Reconstruction Process, SemaPro

2010

Boochs, F.,
Ben Hmida, H.,
Cruz, C.,
Nicolle, C.

BibTex

The Fourth International Conference on Advances in Semantic Processing

Integration of Spatial Technologies and Semantic Web Technologies for Industrial Archaeology

2010

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

6th International Conference on Web Information Systems and Technologies

Integration of high resolution spatial and spectral data acquisition systems to provide complementary datasets for cultural heritage applications

2010

Boochs, F.,
Huxhagen, U.,
Simon, C.,
Mansouri, A.,
Heritage, A.,
Marzani, F.

BibTex

Computer Vision and Image Analysis of Art, 7531

Modern optical measuring systems are able to record objects with high spatial and spectral precision. The acquisition of spatial data is possible with resolutions of a few hundredths of a millimeter using active projection-based camera systems, while spectral data can be obtained using filter-based multispectral camera systems that can capture surface spectral reflectance with high spatial resolution. We present a methodology for combining data from these two discrete optical measuring systems by registering their individual measurements into a common geometrical frame. Furthermore, the potential for its application as a tool for the non-invasive monitoring of paintings and polychromy is evaluated. The integration of time-referenced spatial and spectral datasets is beneficial to record and monitor cultural heritage. This enables the type and extent of surface and colorimetric change to be precisely characterized and quantified over time. Together, these could facilitate the study of deterioration mechanisms or the efficacy of conservation treatments by measuring the rate, type, and amount of change over time. An interdisciplinary team of imaging scientists and art scholars was assembled to undertake a trial program of repeated data acquisitions of several valuable historic surfaces of cultural heritage objects. The preliminary results are presented and discussed.


Increasing the accuracy of untaught robot positions by means of a multi-camera system

2010

Boochs, F.,
SchĂĽtze, R.,
Simon, C.,
Marzani, F.,
Wirth, H.,
Meier, J.

PDF / BibTex

2010 International Conference on Indoor Positioning and Indoor Navigation (IPIN)

We aim to improve the absolute in line positional accuracy of a robot-guided effector to better than 1 mm. We do so using photogrammetric techniques and by relying heavily on simulations to fine tune each parameter and avoid weak configurations. We also use on simulations to design an LED calibration object adapted to this application. A test procedure enables us to validate both the simulated results as well and the calibration procedure. The test results exceed expectations by improving the absolute positioning of a robot effector by a factor of 20.


Einsatz moderner Messtechnik für die präzise dimensionelle Überwachung von Gesteinsoberflächen

2010

Boochs, F.,
Huxhagen, U.,
Simon, C.

BibTex

Naturwissenschaften in der Denkmalpflege - Festschrift zum 20jährigen Bestehen des Instituts für Steinkonservierung e.V.

Ein Mehrkamerasystem zur exakten Positionsbestimmung von beweglichen Effektoren

2010

Boochs, F.,
Raab, C.,
SchĂĽtze, R.,
Wirth, H.,
Meier, J.

PDF / BibTex

9. Oldenburger 3D-Tage

In diesem Beitrag stellen wir eine photogrammetrische Lösung zur Steigerung der Positioniergenauigkeit eines Roboterkopfes vor. Zuerst werden die Notwendigkeit und die Ziele eines solchem Tracking Systems erläutert. Wir stellen aktuelle Tracking Lösungen vor und benennen deren Einschränkungen. Dann wird das Potenzial der photogrammetrischen Lösung zu solchen Zwecken umrissen, gefolgt von einer ausführlichen Beschreibung des hier entwickelten Systems. Schließlich wird durch erfolgte Praxistests gezeigt, dass der Entwurf und die Realisierung des Systems in der Lage ist, die Herausforderung zu halten, die absolute Genauigkeit eines Roboters um den Faktor 20 zu verbessern.


ArchaeoKM: Realizing Knowledge of the Archaeologists

2010

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

Von HandaufmaĂź bis Hightech III

ArchaeoKM: A tool to Manage Knowledge from Archaeological Data

2010

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

CAA10

Räumliches Informationssystem zur Erfassung, Dokumentation und Analyse industriearchäologischer Objekte (RiO)

2009

Boochs, F.,
Pryzibilla, H.J.,
GrĂĽnkemeier, A.

BibTex

Denkmäler3.de – Industriearchäologie, Tagungsband des interdisziplinären Kolloquiums vom 5.-7. November 2008 in Essen

i3mainz - Jahresbericht 2009

2009

Boochs, F.,
Böhm, K.,
Bruhn, K.C.,
Kern, F.,
Klonowski, J.,
MĂĽller, H.,
Neitzel, F.,
SchlĂĽter, M.,
Zipf, A.

PDF / BibTex

i3mainz - Jahresbericht

Das Institut ist mit der Wahrnehmung von Aufgaben im Bereich der angewandten Forschung und Entwicklung sowie des Technologietransfers im fachlichen Umfeld der Geoinformatik und Vermessung beauftragt. Im Zentrum der Arbeiten steht im Allgemeinen die Gewinnung, Verarbeitung und Visualisierung raumbezogener Daten verschiedenartigster Objekte.

 

 


Support of Spatial Analysis through a Knowledgebase - A new concept to exploit spatial information shown for Industrial Archaeology

2009

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

Proc. 24th International Cartographic Conference.

Pre-processing of ROI Localisation based on Local Surface Curvature Analysis for 3D Reconstruction with Multi-resolution.

2009

Boochs, F.,
Böhler, W.,
SchĂĽtze, R.,
Li, W.,
Marzani, F.,
Voisin, Y.

BibTex

Optical Engineering
We present an approach to integrate a preprocessing step of the region of interest (ROI) localization into 3-D scanners (laser or stereoscopic). The definite objective is to make the 3-D scanner intelligent enough to localize rapidly in the scene, during the preprocessing phase, the regions with high surface curvature, so that precise scanning will be done only in these regions instead of in the whole scene. In this way, the scanning time can be largely reduced, and the results contain only pertinent data. To test its feasibility and efficiency, we simulated the preprocessing process under an active stereoscopic system composed of two cameras and a video projector. The ROI localization is done in an iterative way. First, the video projector projects a regular point pattern in the scene, and then the pattern is modified iteratively according to the local surface curvature of each reconstructed 3-D point. Finally, the last pattern is used to determine the ROI. Our experiments showed that with this approach, the system is capable to localize all types of objects, including small objects with small depth.

OptoPose - A multi-camera system for fast and precise determination of position and orientation for moving effector

2009

Boochs, F.,
Raab, C.,
SchĂĽtze, R.,
With, H.,
Meier, J.

PDF / BibTex

Proc. 9th Conference on Optical 3D measurements

This paper presents a photogrammetric solution for the tracking of a robot head. First the need and aims of such a tracking process are explained, followed by a description of actual solutions and their restrictions. Then the potential of photogrammetric solutions for such purposes are outlined, followed by a detailed description of the system developed here. Finally, practical tests  are shown, underlining that the design and realization are able to hold the challenging aims and improve the absolute accuracy of a robot by a factor of 20.


Auf den Punkt genau, Mehrkamerasystem zur flexiblen Positionsbestimmung von beweglichen Effektoren

2009

Boochs, F.

BibTex

Industrial Vision

Ansätze zur geometrischen und semantischen Modellierung von großen, unstrukturierten 3D-Punktmengen

2009

Boochs, F.,
Kern, F.,
Marbs, A.,
SchĂĽtze, R.

PDF / BibTex

Photogrammetrie, Fernerkundung, Geoinformatik - Themenheft Terrestrisches Laserscanning

Der zunehmende Einsatz des terrestrischen 3D-Laserscannings (TLS) für die Bereiche Bauwesen, Architektur und Archäologie liefert immer umfangreichere TLS-Punktmengen in immer kürzerer Messzeit vor Ort. Auf der Auswerteseite erfordern diese per se unstrukturierten Datenmengen in zunehmendem Maße Softwaremodule, die ebenso eine zügige und bequeme, somit auch effiziente, Verarbeitung erlauben. In diesem Artikel werden verschiedene Konzepte und Ansätze zur Konstruktion von halb- und vollautomatisierten Auswertealgorithmen für 3D-Punktmengen vorgestellt. Dabei werden die zu bewältigenden Aufgabenstellungen, wie z.B. Kugel- und Gebäuderekonstruktion, auf spezielle exakt formulierte Detailprobleme begrenzt, sodass das Ziel eines automatisierten Auswertungsprozesses auch in der Praxis erreicht wird. Die Algorithmen arbeiten entweder auf rein geometrischer Basis oder unter Zuhilfenahme von Vorwissen in Form einer Ontologie. Die Verarbeitungsprozesse sind sowohl daten- als auch modellgetrieben. Die Anwendungsbeispiele beschäftigen sich u.a. mit der Passkugelextraktion, der Querprofilableitung bei Schienenverkehrsanlagen und der Modellierung von Gebäudeinnenräumen. Teilweise lassen sich die dargestellten Lösungen durch einfache Variation der Eingangsparameter auf vergleichbare Anwendungsbereiche übertragen.


Ansätze zur geometrischen und semantischen Modellierung von großen, unstrukturierten 3D-Punktmengen

2009

Boochs, F.,
Kern, F.,
Marbs, A.,
SchĂĽtze, R.

PDF / BibTex

DGPF Tagungsband

A flexible multi-camera system for precise Tracking of moving effectors

2009

Boochs, F.,
Raab, C.,
SchĂĽtze, R.,
With, H.,
Meier, J.

PDF / BibTex

Proc. IASTED - Int. conference on Robotics and Applications (RA2009)

This paper shows the potential to improve the absolute positional accuracy of a robot guided effector when applying photogrammetric strategies. First the need and aims of such a tracking process are explained, followed by a description of actual solutions and their restrictions. Then the potential of photogrammetric solutions for such purposes are outlined, followed by a detailed description of the system developed here. Finally, practical tests are shown, underlining that the design and realization are able to hold the challenging aims and improve the absolute accuracy of a robot by a factor of 20.


ArchaeoKM: Toward a Better Archaeological Datasets Management.

2009

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

BibTex

“Proc. CAA09”

i3mainz - Jahresbericht 2008

2008

Boochs, F.,
Böhm, K.,
Bruhn, K.C.,
Kern, F.,
Klonowski, J.,
MĂĽller, H.,
Neitzel, F.,
SchlĂĽter, M.,
Zipf, A.

PDF / BibTex

i3mainz - Jahresbericht
Auch im 10. Jahr nach seiner Gründung als wissenschaftliche Einrichtung der Lehreinheit Geoinformatik und Vermessung der Fachhochschule Mainz legt das i3mainz mit seinem Jahresbericht Rechenschaft über die Aktivitäten der vergangenen 12 Monate ab und gibt einen zusammenfassenden Einblick in die vielseitigen Aktivitäten.
 
 
 

Use of Local Surface Curvature Estimation for Adaptive Vision System Based on Active Light Projection

2008

Boochs, F.,
Böhler, W.,
SchĂĽtze, R.,
Marzani, F.,
Wanjing, L.,
Voisin, Y.

PDF / BibTex

Advanced Concepts for Intelligent Vision Systems

In this paper, we present a new 3D reconstruction approach based on local surface curvature analysis. Its integration can make a normal active stereoscopic system intelligent, and capable to produce directly optimized 3D model. The iterative 3D reconstruction process begins with a sparse and regular point pattern. Based on the reconstructed 3D point cloud, the local surface curvature around each 3D point is estimated. Those 3D points located in flat areas are removed from the 3D model, and a new pattern is created to project more points onto the object where there is high surface curvature. The 3D model is thus refined progressively during the acquisition process, and finally an optimized 3D model is obtained. Our numerous experiments showed that compared to the 3D models generated by commercial system, the loss of morphological quality is negligible, and the gain by the simplification of the model is considerable.


Reconstruction 3D sémantique dans le contexte architectural

2008

Boochs, F.,
Cruz, C.,
Marzani, F.

PDF / BibTex

Extraction et Gestion des Connaissances (EGC08)

Cet article présente une méthode de reconstruction 3D de bâtiment à partir de nuages de points provenant de la mesure d’un scanner laser 3D. L’objectif est d’avoir, au final, une définition sémantique associée au modèle géométrique reconstruit afin d’être exploitable rapidement dans les logiciels CAO/DAO. Cette méthode se fonde sur l’idée qu’il est possible d’améliorer la reconstruction d’une scène 3D à partir d’un nuage de points de manière automatique, si le contexte sémantique de la scène est défini. Pour atteindre ces objectifs, les recherches entreprises depuis plusieurs années sont pluridisciplinaires. En effet, les techniques de reconstruction 3D font appel aux méthodes de vision artificielle de l’équipe M2D+ du laboratoire Le2i situé à Dijon et de l’institut de recherche appliquée i3mainz situé à Mayence en Allemagne. Concernant la partie gestion de la connaissance, celle-ci fait appel aux techniques des systèmes d’information et bases de données de l’équipe SISI du laboratoire Le2i, située également à Dijon.
 


Reconstruction 3D sémantique d'objets architecturaux

2008

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

PDF / BibTex

uBscience, No. 3

Cet article présente une méthode de reconstruction 3D de bâtiment à partir de nuages de points provenant de la mesure d’un scanner laser 3D. L’objectif est d’avoir, au final, une définition sémantique associée au modèle géométrique reconstruit afin d’être exploitable rapidement dans les logiciels CAO/DAO. Cette méthode se fonde sur l’idée qu’il est possible d’améliore la reconstruction d’une scène 3D à partir d’un nuage de points de manière automatique, si le contexte sémantique de la scène est défini. Pour atteindre ces objectifs, les recherches entreprises depuis plusieurs années sont pluridisciplinaires. En effet, les techniques de reconstruction 3D font appel aux méthodes de vision artificielle de l’équipe M2D+ du laboratoire Le2i situé à Dijon et de l’institut de recherche appliquée i3mainz situé à Mayence en Allemagne. Concernant la partie gestion de la connaissance, celle-ci fait appel aux techniques des systèmes d’information et bases de données de l’équipe SISI du laboratoire Le2i, située également à Dijon.


Potential of high-precision measuring techniques for the monitoring of surfaces from heritage objects

2008

Boochs, F.,
Huxhagen, U.,
Kraus, K.

PDF / BibTex

Int. Workshop In-situ Monitoring of Monumental Surfaces (WM08)

Mehrbildkamerasystem zur räumlichen Vermessung von Objektkonturen.

2008

Boochs, F.,
Raab, C.,
SchĂĽtze, R.,
Meier, J.,
Luhmann, T.,
MĂĽller, C.

PDF / BibTex

Optische 3D-Messtechnik, Photogrammetrie, Laserscanning - Beiträge der Oldenburger 3D-Tage

Dargestellt wird ein Messsystem, das die Lage von Objekten mit einer räumlich definierten Geometrie hoch präzise bestimmen kann. Im Bereich des Karosseriebaus - wie auch in anderen Bereichen der industriellen Produktion – treten an den zu bearbeitenden Produktionsteilen Elemente verschiedener Geometrietypen auf. Als Beispiele genannt seien Stanzungen, Bohrungen oder Schweißbolzen. An ihnen können eventuell auftretende Deformationen des gesamten Produktionsteils abgelesen werden bzw. bei nicht erkennbaren Fehlern auf eine insgesamt korrekte Geometrie geschlossen werden. Neben den Regelgeometrien von Kreis und Rechteck findet man z.B. im Falle von Autokarosserien auch Variationen davon (z.B. Langloch, Vieleck mit rechten Winkeln). Im derzeitigen Entwicklungszustand können in der laufenden Produktion kreisrunde Objektkonturen vermessen werden. Das hier beschriebene System ist jedoch vom Design her prinzipiell in der Lage, Messobjekte weiterer Geometrietypen zu vermessen. Durch Überbestimmungen ergibt sich die Möglichkeit die erzielten Messergebnisse zu bewerten. In den Prozeßablauf ist eine automatische Kalibierung und Orientierung integriert, um Veränderungen an Kameras erfassen zu können und so die Genauigkeit des Messsystems sicherzustellen.


Managing knowledge for Spatial Data: A Case study of Knowledge Management for Spatial Data of Findings

2008

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

PDF / BibTex

Int. Conference "Digital Heritage in the new knowledge environment: shared spaces & open paths to cultural content"

Shifting from conventional approaches to an unusual approach in industrial archaeology, we suggest the use of a web platform based on semantic web technologies and knowledge management. This platform is used to store data during the excavation process and to manage knowledge acquired during the identification process of the findings. The principle of our approach consists in using semantic annotations in order to have a semantic view on data sets. The shared ontology that defines an index on the semantic annotations allows us to build a global schema between data sources. This global schema allows annotating, indexing, searching and retrieving data and documents.


Intelligent Spatial Object Digitization Based On Stereo Images

2008

Boochs, F.,
Böhler, W.,
SchĂĽtze, R.,
Li, W.,
Marzani, F.,
Voisin, Y.

PDF / BibTex

Int. Conference on Signal and Image Processing (SIP 2008)

In computer vision, active stereoscopic systems are widely used for 3D surface reconstruction of real objects. Many structured light approaches have been shown in the literature. However, not anyone adapted the processing to the geometrical characteristics of the surface. Instead, the sensing process covers uniformly the entire object in order to obtain a very dense 3D point cloud. A further time-consuming mesh simplification task is therefore necessary to simplify the manipulation of the 3D model. This could be avoided, if the sensing process is already as intelligent as necessary to generate only those points needed to optimally describe the surface. In our development we show a solution, which is based on an iterative process adapting the point distribution to the spatial structure of the object. Starting from an initial sparse point pattern a refinement process is guided which analyses the object based on curvature measurements allowing to detect areas of greater morphological variation where further measurements have to be introduced. Thus, the acquired 3D model is already optimised during the acquisition process. Numerous experiments showed that compared to the 3D models generated from commercial system, the loss of morphological quality is negligible, but the gain by the simplification of the model is considerable.


Industrial Archaeology: Case study of Knowledge Management for Spatial Data of Findings

2008

Boochs, F.,
Karmacharya, A.,
Cruz, C.,
Marzani, F.

PDF / BibTex

Adaptive Hypermedia

Shifting from conventional approaches to an unusual approach in industrial archaeology, we suggest the use of a web platform based on semantic web technologies and knowledge management. This platform is used to store data during the excavation process and to manage knowledge acquired during the identification process of the findings. The principle of our approach consists in using semantic annotations in order to have a semantic view on data sets. The shared ontology that defines an index on the semantic annotations allows us to build a global schema between data sources. This global schema allows annotating, indexing, searching and retrieving data and documents.


Final Concept of the Photogrammetric Alignment System RALF for High-Radiation Areas of FAIR

2008

Marbs, A.,
Boochs, F.,
Pschorn, I.

PDF / BibTex

IWAA08 - International Workshop on Accelerator Alignment

At IWAA 2006 we presented the preliminary concept of a new alignment system, designed for the use in inaccessible, high-radiation areas of the future “Facility for Antiproton and Ion Research” (FAIR) at GSI. The alignment system RALF – Remote Alignment on the Fly – is based on a photogrammetric approach. This will ensure a remote-controlled, accurate and fast measurement process.

The final project phase consisted of validation and optimization of the concept by means of practical investigation on a test site using a RALF prototype. Besides investigations of the measurement configuration also practical aspects like type and size of targets or illumination influence have been studied. The results of the test installation confirmed the theoretical concept and therefore put the final concept on a reliable basis.


Ein stereoskopisches Nahbereichsystem auf Basis von adaptiver Musterprojektion

2008

Boochs, F.,
Böhler, W.,
SchĂĽtze, R.,
Li, W.,
Marzani, F.,
Voisin, Y.,
Seyfert, E.

PDF / BibTex

DGPF-Jahrestagung

Beschrieben wird ein aktives stereoskopisches Messkonzept zur Rekonstruktion von 3DObjektgeometrien. Durch automatische Adaption des projizierten Musters erfolgt dabei eine Anpassung der Punktdichte an die Objektgeometrie bereits während der Erfassung. Das Resultat des Prozesses ist ein optimiertes 3D-Model, welches das vermessene Objekt mit einem Minimum an Punkten beschreibt. Es wird gezeigt, dass mit der von uns entwickelten Methode ein derart optimiertes Model ohne Genauigkeitseinbußen gewonnen werden kann.


Aktuelle Arbeiten auf dem Gebiet der Informations- und Messtechnik

2008

Boochs, F.,
Klonowski, J.,
MĂĽller, H.

PDF / BibTex

Aktuelle Arbeiten auf dem Gebiet der Informations- und Messtechnik - Festschrift zum 10. Jahrestag der GrĂĽndung des i3mainz

i3mainz - Jahresbericht 2007

2007

Böhm, K.,
Boochs, F.,
Kern, F.,
Klonowski, J.,
MĂĽller, H.,
Neitzel, F.,
SchlĂĽter, M.,
Zipf, A.

PDF / BibTex

i3mainz - Jahresbericht

Das Institut ist als wissenschaftliche Einrichtung der Lehreinheit Geoinformatik und Vermessung der Fachhochschule Mainz mit der Wahrnehmung von Aufgaben im Bereich der angewandten Forschung und Entwicklung sowie des Technologietransfers im fachlichen Umfeld der Geoinformatik und Vermessung beauftragt. Der größte Teil der Projekte befasst sich mit der Gewinnung, Verarbeitung und Visualisierung raumbezogener Daten verschiedenartigster Objekte.


Reconstruction of Architectural Objects from 3D scanner survey

2007

Boochs, F.,
Cruz, C.,
Seyfert, E.

PDF / BibTex

Publikationen der DGPF - DGPF-Jahrestagung 2007

This paper presents a method that aims at reconstructing a 3D building from point clouds measured by 3D scanner. It starts from the idea that it is easier to rebuild a scene using available knowledge about the scene’s elements. This solution has to consider the three following aspects. How to find objects in a cloud of points? How to define a geometric and semantic coarse model? Which algorithms to use as a propagation method to find all objects in the cloud of points? In our solution the user has to assign the context by defining a coarse model of the building to be reconstructed. Then the user interactively selects a set of points in the cloud that represents an element. The selection is also mapped to the coarse model by assigning the corresponding wall in the “CM”. Then the user starts the reconstruction algorithm. Within an iterative process the plane representing the wall is found and will be used to correct the model. The process starts with the mapped plane, corrects it, and continues with information in “CM” to detect an adjacent plane by propagation.


LOW-COST IMAGE BASED SYSTEM FOR NON-TECHNICAL EXPERTS IN CULTURAL HERITAGE DOCUMENTATION AND ANALYSIS

2007

Boochs, F.,
MĂĽller, H.,
Heinz, G.,
Huxhagen, U.

BibTex

Proceedings of the XXI International Symposium CIPA 2007, AntiCIPAting the future of the cultural past

As it is widely known documentation is an important issue within the tasks of conservation, preservation and restoration of Cultural Heritage objects. In this context high-tech measuring methods which, at the same time, are located in the low-cost price segment, are of special interest. In this paper a special solution is presented, which preserves the potential of state-of-the-art photogrammetry and is simple enough to be used by non-technical experts on their own. The design of the system enables, e.g., scientists of the humanities to benefit from modern 3D measuring methods in their daily work without needing permanent support by technical professionals. The system consists of off-the-shelf digital cameras which actually have reached a high level of resolution, of image quality and of functionality, all at a reasonable price. Ease of use for measuring purposes is guaranteed by mounting one or two cameras on a specially developed space bar. The corresponding evaluation software allows for stereo-viewing on standard PC hardware, for various methods of stereophotogrammetric model referencing, for object digitizing as vector features, for data export as CAD data, for production of orthophotos and of true-scale object representations of curved surfaces. Two projects are reported for illustration of the system’s application. The first project deals with the documentation of 500 caves in the Ukrainian area of Crimea, the second one gives an example for the application in the field of preservation of historical monuments in Germany. In both projects the stereophotogrammetric system was used as an integrated part within the full spectrum of modern metrology methods, comprising laser scanning, tacheometry, GPS and more.


Dokumentation von Objekten der Denkmalpflege unter Einsatz hybrider Messmethoden

2007

Boochs, F.,
Conseil, N.,
Huxhagen, U.

BibTex

Photogrammetrie, Laserscanning, Optische 3D-Messtechnik - Beiträge der Oldenburger 3D-Tage 2007

Der vorliegende Artikel behandelt den korrekten und angemessenen Einsatz der modernen Messtechnik fĂĽr die speziellen Zwecke der Denkmalpflege (Dokumentation, Bauforschung) und die Nutzung der entstehenden hybriden Daten verschiedener Messsysteme.
Diverse Projekte haben gezeigt, dass die unterschiedlichen Anforderungen in Bezug auf die Aufgabenstellungen und eine sich daraus ergebende angemessene Wahl der Mittel, sowie die interdisziplinäre Zusammenarbeit mit Experten des jeweiligen Anwendungsgebietes, unbedingt notwendig, aber noch immer nicht allgemein praktiziertes Vorgehen ist. Es ist daher nötig, Vor- und Nachteile verschiedener Vermessungspraktiken aufzuzeigen und Anregungen für ein optimiertes Vorgehen zu liefern.
Anhand konkreter Beispiele, der Porta Nigra in Trier und dem Herkules Denkmal in Kassel, bei denen unterschiedliche Meßsysteme wie 3D-Laserscanner, hoch auflösende Streifenprojektionsscanner, Totalstationen, digitale und analytische Photogrammetrie sowie hoch auflösende digitale Oberflächenbilder eingesetzt wurden, werden Konzepte aufgezeigt und Ergebnisse der unterschiedlichen Erfassungs- und Auswertemethoden bzw. der kombinierten Daten präsentiert und ihr Nutzungspotenzial dokumentiert.
In die Bewertung wurden Anwender aus den Bereichen Kunstgeschichte, Archäologie und Architektur einbezogen, die den Stellenwert moderner Verfahren vor dem Hintergrund ihrer eigenen Ansprüche angaben und gegenüber herkömmlichen Vorgehensweisen abgrenzen konnten.


3D contour detection by means of a multi camera system

2007

Boochs, F.,
Raab, C.,
SchĂĽtze, R.,
Traiser, J.,
Wirth, H.

PDF / BibTex

52nd IWK-Internationales Wissenschaftliches Kolloquium / Technische Universität Ilmenau

In this paper we show a solution dedicated to measure spatial contours by means of multiple cameras. The contours allow to derive position and orientation, if necessary, of objects which have to be measured very precisely. The use of multiple cameras makes the system very flexible and robust. Set up, processing tasks and results of the system are presented.


i3mainz - Jahresbericht 2006

2006

Böhm, K.,
Boochs, F.,
Klonowski, J.,
MĂĽller, H.,
SchlĂĽter, M.,
Zipf, A.

PDF / BibTex

i3mainz - Jahresbericht

Das Institut ist als wissenschaftliche Einrichtung der Lehreinheit Geoinformatik und Vermessung der Fachhochschule Mainz mit der Wahrnehmung von Aufgaben im Bereich der angewandten Forschung und Entwicklung so wie des Technologietransfers im fachlichen Umfeld der Geoinformatik und Vermessung beauftragt. Der größte Teil der Projekte befasst sich mit der Gewinnung, Verarbeitung und Visualisierung raumbezogener Daten verschiedenartigster Objekte.

 

 


A Photogrammetric Alignment Approach at High-Radiation Areas of FAIR

2006

Marbs, A.,
Boochs, F.,
Pschorn, I.

PDF / BibTex

IWAA06 - International Workshop on Accelerator Alignment

Introduced at IWAA 2004, the conceptual design of the alignment system RALF, Remote Alignment on the Fly, has been advanced in the past two years. The goal of RALF is to provide high-precision survey and alignment at inaccessible areas of  FAIR, the new international accelerator 'Facility for Antiproton and Ion Research' at GSI, Darmstadt. A photogrammetric approach was chosen for this purpose, facing problems and limitations like high radiation, little space and denial of any human access to the affected areas. This paper will present the status quo of the concept and give an overview of the previous work. This includes the development of a basic concept, evaluation of camera specifications and geometric camera tests. With regard to the expected radiation environment investigations concerning radiation hardness of CCDs were carried out as well as practical camera tests at radioactive conditions. Furthermore simulations of potential camera configurations have been accomplished and possible constraints for the accelerator design have been evaluated. A RALF test installation under realistic conditions is planned for the upcoming months. First parts of FAIR will be commissioned around 2010.


Investigating the Influence of Ionizing Radiation on Standard CCD Cameras and a Possible Impact on Photogrammetric Measurements

2006

Marbs, A.,
Boochs, F.

PDF / BibTex

ISPRS Commission V Symposium - Image Engineering and Vision Metrology

In the context of high precision metrology tasks in heavy radiated areas questions arose concerning the applicability of digital cameras for photogrammetric purposes under these special conditions. The background for this problem is the conceptual design of a particle accelerator. After initial installation some areas of the new facility will not be accessible due to an expected high level of neutron production and activation. Therefore a new remote-controlled survey and alignment system has to be developed. For this purpose close-range photogrammetry appears to be the most applicable technique.

But in technical literature hardly any research results can be found, concerning the influence of ionizing radiation on digital image sensors, particularly for photogrammetric use. Hence basic research as well as practical tests were carried out, to investigate the influence of neutron and gamma radiation on CCD sensors under photogrammetric aspects. The results show a significant influence of radiation on the image quality, but only for high gamma doses. Lower dose rates, as they are expected at the accelerator, are not going to be a serious problem. Further tests are planned.


Digital reconstruction of archaeological objects using hybrid sensing techniques - the example Porta Nigra at Trier

2006

Boochs, F.,
Huxhagen, U.,
Hoffmann, A.,
Welter, D.

PDF / BibTex

From Space to Place - 2nd International Conference on Remote Sensing in Archaeology

Digital reconstruction of archaeological objects may serve for different purposes and accordingly vary in the information provided. Simple web-based visualisations primarily need textural data combined with more or less accurate spatial geometry, classical documentations require complete and precise 3d-models allowing to eventually rebuild the object in case of damage, whereas basic research to the object itself, the history of its edification, the origin of the material used and the analysis of exiting damages demands a maximum of textural and geometrical information. In correspondence to these aims techniques for the data collection have to be selected, which will result in higher effort and higher demands to performance and versatility when more complex reconstructions are needed.

Looking at the actual technological progress, 3D-scanning, both structured light and laser based, and digital photogrammetry, for example, are providing possibilities to collect maximal information at a large spectrum. On the other hand, the potential of these new technologies sometimes will be overestimated, whereas effort and need for an adopted processing of data and a customised use of instruments often is  underestimated. If therefor seems necessary to give a look into an interdisciplinary project of historians and surveyors dedicated to evaluate  he value of these new sensing technologies.


Digital Documentation of Cultural Heritage Objects using hybrid recording techniques

2006

Boochs, F.,
Heinz, G.,
Huxhagen, U.,
MĂĽller, H.

PDF / BibTex

The 7th International Symposium on Virtual Reality, Archaeology and Cultural Heritage VAST

Using hybrid recording techniques is a well established procedure in the documentation of cultural heritage objects. Due to changes in the technological process, to choose the appropriate techniques and systems may be difficult and has to be adopted for every single project. The potential of new technologies sometimes tends to be overestimated whereas the need for especially adopted usage and processing may be underestimated. In combination with the needs of the appropriate and concerned historians or humanists the special requirements for the investigation and documentation of the objects have to be checked. The paper shows concepts and present results for several example sites in Germany e.g. the documentation of Porta Nigra, a roman city gate in Trier, and the Herkules-Monument in Kassel. Used techniques in the projects are 3D laser scanning, high resolution textured-light scanning, total stations, digital and analytical photogrammetry and high resolution digital surface images - all of them in combination with the conventional manual inspection and evaluation of the objects  themselves by the particular experts from other disciplines.


i3mainz - Jahresbericht 2005

2005

Böhler, W.,
Böhm, K.,
Boochs, F.,
Klonowski, J.,
MĂĽller, H.,
SchlĂĽter, M.,
Zipf, A.

BibTex

i3mainz - Jahresbericht

Vom 3D-Objekt zur 3D-Kopie - Mobiles AufmaĂź einer Bronzeplastik unter Einsatz eines handgefĂĽhrten 3D-Scanners am 3D-Gelenkmessarm

2005

Linscheid, M.,
SchlĂĽter, M.,
Boochs, F.,
MĂĽller, H.

BibTex

Schriftenreihe Informations und Messtechnik - Entwicklungen auf dem Gebiet der Informations- und Messtechnik

Ăśberlegungen zur genauen Beschleunigervermessung in aktivierten Bereichen mittels Photogrammetrie

2005

Marbs, A.,
Boochs, F.,
Luhmann, T.

PDF / BibTex

Photogrammetrie - Laserscanning - Optische 3D-Messtechnik: Beiträge der Oldenburger 3D-Tage
Die Größe, der geometrische Aufbau und die geplanten Betriebsformen des zukünftigen Beschleunigersystems der Gesellschaft für Schwerionenforschung, Darmstadt (GSI) führen zu ganz neuen Aufgabenstellungen für die Einrichtung und Überwachung der strahlführenden Komponenten. Mit der Auslegung der Anlage stößt man nicht nur im physikalischen Bereich in ganz neue Dimensionen vor, sondern auch aus messtechnischer Sicht wird bisher nicht sicher beherrschtes Terrain betreten. Hierbei spielen neben der mindestens um Faktor zehn verschärften Genauigkeits-Größenrelation die Existenz von Maschinenbereichen, die nach Erstinbetriebnahme der neuen GSI-Anlage aufgrund der erwarteten sehr hohen Strahlungsemissionen nicht oder nur kurzzeitig unter starken Sicherheitsvorkehrungen begehbar sein werden, eine entscheidende Rolle. Die bewährte, auf Betreten der Örtlichkeit fußende Mess- und Regeltechnologie während der Wartungsphasen kann daher wegen der starken und anhaltenden Radioaktivität in diesen Bereichen definitiv nicht mehr eingesetzt werden. Es ist nun ein völlig neues Mess- und Justierkonzept notwendig, das sowohl die gewachsenen Genauigkeitsanforderungen erfüllt, als auch unter Berücksichtigung aller durch den Betrieb gegebenen Rahmenbedingungen praktisch anwendbar ist. Dieses Konzept soll entworfen, theoretisch wie praktisch abgesichert und zu einem für den Betrieb der neuen Anlage einsatzfähigen Ansatz fortentwickelt werden. Der nachfolgende Beitrag schildert die bisherigen Überlegungen und beschreibt den Problemkreis aus messtechnischer Sicht. Neben der Vorstellung des auf einem photogrammetrischen Ansatz basierenden Grundkonzeptes werden die bisherigen Untersuchungen im Rahmen eines Forschungsprojektes dargestellt.

A stereo system with adaptive pattern projection for the determination of object geometries

2005

W., L.I.,
Boochs, F.,
F., M.A.R.Z.A.N.I.,
Böhler, W.,
Y., V.O.I.S.I.N.

PDF / BibTex

International Conference On Imaging
This paper presents a practical projector-camera based 3D object modelling system developed in our laboratories. The hardware consists of a computer, a video projector and at least two digital cameras. The 3D modelling of a real object is realized automatically by applying an adaptive spot projection technique. For each spot in the first image, an algorithm is applied to find its correspondence in the second one, thus a cloud of 3D points is finally generated by triangulation, which is necessary for the calculation of the geometry of the object. In the case that the surface of the object is irregular, an iterative optimization process is lanced to improve the 3D reconstruction speed and the precision of the reconstructed model.

Objektvermessung auf der Basis von projizierten Punktwolken und Photogrammetrie (CloudPro)

2005

Boochs, F.

PDF / BibTex

Control - Internationale Fachmesse für Qualitätssicherung
CloudPro steht für Cloud Projection und benennt ein Verfahrenskonzept, das der Bestimmung der räumlichen Geometrie von Oberflächen dient. Die zu vermessende Oberfläche wird mit einer optischen Projektion signalisiert und mit Kameras erfasst. Die erzeugten Bilder werden verschiedenen radiometrischen und geometrischen Rechenoperationen unterzogen, an deren Ende in jedem Bild eine Vielzahl erkannter Punktsignale vorliegt. Diese werden in einer simultanen Triangulation weiterverarbeitet, womit eine präzise und ausgewogene Bestimmung der Raumpositionen der Punktsignale möglich ist. Aus dieser Wolke diskreter Punkte kann abschließend die darin repräsentierte Oberfläche bestimmt werden.

Improvement of the automatic detection of spatial objects using spectral reflectance information

2005

A., M.A.N.S.O.U.R.I.,
M., T.W.A.R.D.O.C.H.L.I.B.,
Boochs, F.,
F., M.A.R.Z.A.N.I.,
P., G.O.U.T.O.N.

PDF / BibTex

n.A.
In this paper we investigate the problem of automatic detection of specific spatial objects using colorimetric attributes. We present a new solution based on the use of a multispectral camera instead of an RGB classical one. Using such a multispectral camera combined with a flexible protocol of calibration and a supervised algorithm of spectral reflectance reconstruction avoids metamerism encountered with the classical RGB camera. In each pixel of an imaged scene, we reconstruct a spectral reflectance. Afterwards this spectral reflectance is projected on color space using a standard illuminant. Doing this, the algorithm of color attribute detection works better since we retrieve the colors for which such algorithm was designed. The results are satisfying and demonstrate the reliability of such a solution.

GIS-Funktionen und WebMapping im Historischen GIS Germany

2005

Zipf, A.,
Dietze, L.,
Wachtendorf, C.,
Boochs, F.,
MĂĽller, H.

PDF / BibTex

Schriftenreihe Informations und Messtechnik
Im Projekt HGIS Germany wird die Entwicklung der deutschen Staatenwelt mit ihren zahlreichen Sonderfällen wie Kondominaten, Exklaven etc. recherchiert und digital in einem Geoinformationssystem und Datenbanken abgelegt. Hierdurch bestehen zahlreiche Möglichkeiten zur weiteren Analyse und Visualisierung der gewonnen Daten durch das GIS. Diese werden exemplarisch aufgezeigt und die technologischen Aspekte des zusätzlich entwickelten kartenbasierten Informationssystems im Internet dargestellt.

3D Reconstruction based on Semantic Information for Architectural Applications

2005

Cruz, C.,
Boochs, F.,
Nicolle, C.

PDF / BibTex

Schriftenreihe Informations und Messtechnik

This paper presents the results of a feasibility study concerning the use of semantic information for the simplification of 3D reconstruction for architectural objects using data from in- and outside of a digitised building. The paper gives an overview to actual techniques for the spatial digitisation of buildings and their 3D reconstruction and shows a way to use semantic information for improvements. The approach of this paper is new, because it uses a semantic characteristics for the geometrical correction of spatial models derived from scanned or photogrammetric data.


Entwicklungen auf dem Gebiet der Informations- und Messtechnik, Festschrift zur Verabschiedung von Prof. Dr. Wolfgang Böhler

2005

Boochs, F.,
MĂĽller, H.

BibTex

Schriftenreihe Informations und Messtechnik

Neue Anwendungen der Informations- und Messtechnik - Digitale Bildverarbeitung, Fernerkundung, Raumbezogene Informationssysteme, Visualisierung, Aus- und Weiterbildung

2003

Boochs, F.,
MĂĽller, H.

PDF / BibTex

n.A.

Die mögliche Dynamik von Veränderungsprozessen in unserer, von der Informationstechnik geprägten Gesellschaft mussten wir in der jüngeren Vergangenheit sehr schmerzlich erfahren. Das Potenzial der Informationstechnologie und die zu erwartenden Veränderungen für Arbeitsabläufe, die Kommunikation und das alltägliche Leben in unserer Gesellschaft ist nicht einmal komplett erkannt, und schon hat die Ende der 90er Jahre entstandene Euphorie mit dem weitgehenden Zusammenbruch des Neuen Marktes ein jähes Ende gefunden und ist einer gewissen Frustration und Enttäuschung gewichen. So wie das Pendel durch übersteigerte Erwartungen an den revolutionierenden Charakter der Informationstechnik auf der einen Seite zu weit ausschlug, so sind nun Negativreaktionen und Pessimismus aufgekommen, die man für ebenso überzogen und unberechtigt halten darf. Wir stehen nach wie vor mitten in einem gravierenden Wandel vieler Mechanismen unserer Gesellschaft und es bedarf jetzt einer sachlicheren Betrachtung von Chancen und Risiken der Informationstechnologie, damit die Entwicklung sich in Ruhe weiter vollziehen und zu einem für uns alle positiven Ergebnis kommen kann.


TARGET - a flexible installation for inspection of industrial objects

2003

Boochs, F.,
Freisberg, M.,
Twardochlib, M.

PDF / BibTex

n.A.

A solution for industrial inspection purposes will be shown. The conception is based on digital colour images taken from numerous perspectives around the object to be controlled. The process of image orientation is simplified and improved by the use of spatial reference objects. In contrast to conventional planar targets they are visible from all views and allow a better concatenation of the images. In addition, they can introduce a scale information what simplifies preparatory actions to be done within object space and can contribute with their spatial shape. For the inspection the object will be marked by a laser projection system with point or line
patterns. The main aspects of the solution will be shown together with first test results.


Einsatz des Open Source CAD Paketes "Open CASCADE" fĂĽr die stereoskopische Objekterfassung aus digitalen Messbildern

2003

Boochs, F.,
Eckhardt, S.,
Fischer, B.

PDF / BibTex

n.A.

Der Beitrag stellt ein Konzept zur Integration eines Open Source CAD-Paketes in eine PC-gestĂĽtzte Stereomessstation vor. Ziel dieser Kombination ist die weitestgehende Nutzung von vorhandenen CADWerkzeugen und deren Nutzbarmachung fĂĽr photogrammetrische Messzwecke. Dabei sollen die Vorteile der objektorientierten Beschreibung und Verwaltung von Geometrien erhalten bleiben. FĂĽr die Integration sind Schnittstellen zwischen der punktbezogenen photogrammetrischen Messung und der objektbezogenen
Datenstruktur der CAD-Welt zu schaffen und es muss ein Weg fĂĽr die Ăśberlagerung der Stereobilder mit den CAD-Objekten gefunden werden. Der eingeschlagene Weg wird vorgestellt und die unter Nutzung von Open Source Komponenten notwendigen Entwicklungen werden aufgezeigt.


DISCA und DISTA - ein stereophotogrammetrisches Aufnahme- und Auswertesystem fĂĽr einfache Messaufgaben

2003

Boochs, F.

PDF / BibTex

n.A.

Ein einfaches digitales Mess- und Aufnahmesystem für die Gewinnung der dreidimensionalen Geometrie von Objekten wird vorgestellt. Es beruht auf der Nutzung herkömmlicher Digitalkameras, die zu einem stereofähigen Aufbau verbunden werden und die Gewinnung direkt nutzbarer stereoskopischer Bildpaare erlauben. Die Auswertung der Stereobilder erfolgt an einem herkömmlichen, mit einer Stereographikkarte ausgerüstetem PC und gestattet die Erfassung von Objektgeometrien, die anschließend im DXF-Format abgespeichert werden.


Detection of spatial orientation objects for automatic orientation of arbitrary arranged metric images

2003

Boochs, F.

PDF / BibTex

n.A.

The paper presents a new solution for the automatic orientation of metric images using spatial tie objects. The
use of tie objects avoids problems being inevitable, when planar tie points are projected under oblique views into an
image or when the view angles are differing strongly for different images. Spatial tie objects however, are visible
from any viewing direction and allow a sure identification. Algorithms have been developed allowing
to detect and localise such spatial tie objects automatically and will be presented here. The principal functionality
will be shown and practical examples demonstrate the correctness of the conception.


A PC-based stereo system for the collection of 3D-data for as-built documentation

2002

Boochs, F.,
Eckhardt, S.,
Fischer, B.

PDF / BibTex

VII. International Congress of Earth Sciences

A precise and true geometrical description of built objects is a fundamental base of most applications and is a must in the field of CAD. Such a geometry is in general expressed by a large number of individual points placed on the geo-object in consideration. The total quantity of these object points is called digital object model and is generated by a data collection process. Several different techniques are known for the collection of points and a very common one is the use of metric stereo images. Then special equipment like stereo plotters have to be used. The technology of such instruments has been developed permanently and has led to very productive and flexible computer assisted plotting systems. Recently, the big technological step to pure digital systems has been undertaken. However, the need of having the image information digitally available is a very demanding constraint for digital plotting systems. In many geo-applications images with a size of 23 by 23 cm2 have to be used, what results in very huge data sets. Therefore most digital plotting systems have special hard- and software components for the handling and display of such large images.


PC-gestĂĽtzte 3D-Messung in virtuellen Modellen realer Objekte

2002

Boochs, F.

BibTex

Publikationen zur Vortragsreihe im Futurepark, CeBIT 2002

DISTA - a portable software solution for 3D-compilation of photogrametric image blocks

2001

Boochs, F.,
MĂĽller, H.,
Neifer, M.

PDF / BibTex

n.A.

A photogrammetric evaluation system used for the precise determination of 3D-coordinates from blocks of large metric images will be presented. First, the motivation for the development is shown, which is placed in the field of processing tools for photogrammetric evaluation tasks. As the use and availability of metric images of digital type rapidly increases corresponding equipment for the measuring process is needed. Systems which have been developed up to now are either very special ones, founded on high end graphics workstations with an according pricing or simple ones with restricted measuring functionality. A new conception will be shown, avoiding special high end graphics hardware but providing a complete processing chain for all elementary photogrammetric tasks ranging from preparatory steps over the formation of image blocks up to the automatic and interactive 3D-evaluation within digital stereo models. The presented system is based on PC-hardware equipped with off the shelf graphics boards and uses an object oriented design. The specific needs of a flexible measuring system and the corresponding requirements which have to be met by the system are shown. Important aspects as modularity and hardware independence and their value for the solution are shown. The design of the software will be presented and first results with a prototype realised on a powerful PC-hardware configuration will be featured.


Neue Anwendungen der Informations- und Messtechnik - Digitale Bildverarbeitung, Fernerkundung, Raumbezogene Informationssysteme, Visualisierung, Aus- und Weiterbildung

2001

Boochs, F.,
MĂĽller, H.

PDF / BibTex

n.A.

Das Informationszeitalter charakterisiert sich einerseits durch den allgegenwärtigen Einsatz von Computern und ihre damit einhergehende Integration in viele Prozesse und Anwendungen und andererseits durch die Kürze der Innovationszyklen. Das hohe Maß an Integration hat zur Folge, dass in allen Bereichen des gesellschaftlichen und beruflichen Lebens Daten erfasst und vom Computer weitergeleitet, manipuliert, gespeichert, analysiert werden, Steuerungsmechanismen vom Computer kontrolliert und automatische Abläufe überwacht werden. Denkt man an die Komplexität der in unserer hoch entwickelten Zivilisation ablaufenden Prozesse, so ist unschwer vorstellbar vor welchen Herausforderungen die Datenverarbeitungstechnik in der Zukunft noch stehen wird.


Ein Verfahren zur automatischen Detektion von kubischen VerknĂĽpfungsobjekten in digitalen Farbmessbildern.

2001

Boochs, F.

PDF / BibTex

n.A.

Der Beitrag stellt ein Verfahren vor, mit dessen Hilfe kubische Verknüpfungsobjekte in terrestrischen Messbildern erkannt und für die Orientierung der Messbilder eingesetzt werden können. Mit dem Verfahren wird das Ziel verfolgt, Einschränkungen hinsichtlich der Verknüpfung von Messbildern aufzuheben, die durch Sichtbarkeits- und Abbildungsprobleme bei den heute üblicherweise eingesetzten ebenen Signalen entstehen können. Dazu ist eine Lösung entwickelt worden, die in Farbbildern räumliche Signale erkennt und die Koordinaten der Targets für die Zuordnung und Bildorientierung bereitstellt. Im Beitrag wird das Vorgehen im Zusammenhang mit der Bildanalyse beschrieben und an Bildbeispielen
dokumentiert.


A new solution for the automatic orientation of arbitrary arranged images.

2001

Boochs, F.

PDF / BibTex

n.A.

The paper presents a new solution allowing to substitute tie points by tie objects.
The use of tie objects avoids problems being inevitable, when planar tie points are projected under oblique views into an image or when the view angles are differing strongly for different images. Spatial tie objects however, are visible from any viewing direction and allow a sure identification. Algorithms for an automatic detection and localisation of such spatial tie objects have been developed and will be presented here. The principal functionality will be shown and practical examples demonstrate the correctness of the conception.


A new Approach to Edge-preserving Smoothing for Edge Extraction and Image Segmentation

2000

Garnica, C.,
Boochs, F.,
Twardochlib, M.

PDF / BibTex

ISPRS Symposium, Amsterdam, The Netherlands, International Archives of Photogrammetry and Remote Sensing

This paper introduces a new approach to edge-preserving smoothing of digital images. It is designed for an effective elimination of the image noise within digital images what is an essential step in applications like edge detection or image segmentation.
The approach presented here tries to overcome some of the disadvantages of existing smoothing filters and is conceived as an extension of the edge-preserving Maximum Homogeneity Neighbour Filter. The algorithm cleans up the image noise in the homogeneous areas, but preserves all image structures like edges or corners. It is shown that the new filter algorithm combines the advantageous features of different types of filters. The algorithm is not only applicable to grayscale images, but can be extended to multi-channel data, like color images too. The performance of the algorithm is achieved by a more complex and differentiating treatment of the image data compared to conventional concepts.


An OpenGL based stereo system for 3D-measurements.

2000

Boochs, F.,
Gehrhoff, A.,
Neifer, M.

PDF / BibTex

n.A.

A stereo system designed and used for the measurement of 3D-coordinates within metric stereo image pairs will be
presented. First, the motivation for the development is shown, allowing to evaluate stereo images. As the use and availability of metric images of digital type rapidly increases corresponding equipment for the measuring process is needed. Systems which have been developed up to now are either very special ones, founded on high end graphics workstations with an according pricing or simple ones with restricted measuring functionality. A new conception will be shown, avoiding special high end graphics hardware but providing the measuring functionality required. The presented stereo system is based on PC-hardware equipped with a graphic board and uses an object oriented programming technique. The specific needs of a measuring system are shown and the corresponding requirements which have to be met by the system. The key role of
OpenGL is described, which supplies some elementary graphic functions, being directly supported by graphic boards and thus provides the performance needed. Further important aspects as modularity and hardware independence and their value for the solution are shown. Finally some sample functions concerned with image display and handling are presented in more detail.


An object-oriented stereo system for 3D-measurements

2000

Boochs, F.,
Gehrhoff, A.,
Neifer, M.

PDF / BibTex

ISPRS Symposium, Amsterdam, The Netherlands, International Archives of Photogrammetry and Remote Sensing

A stereo system designed and used for the measurement of 3D-coordinates within metric stereo image pairs will be
presented. First, the motivation for the development allowing to evaluate stereo images is shown. As the use and availability of digital metric images rapidly increases corresponding equipment for the evaluation and measuring process is needed. Systems which have been developed up to now are either very special ones, founded on high end graphics workstations with an according pricing or simple ones with restricted measuring functionality. A new conception will be shown, avoiding special high end graphics hardware but providing the measuring functionality required. The presented stereo system is based on PC-hardware equipped with a graphic board, uses an object-oriented programming technique and allows a connection to CAD packages like AutoCAD®. The specific conception of the system are shown. The key role of OpenGLTM is described, which supplies some elementary graphic functions, being directly supported by graphic boards and thus provides the performance needed. Further important aspects as modularity and hardware independence and their value for the solution are shown. Finally some sample functions concerned with image display and handling are presented in more detail.


Bestimmung eines detaillierten Objektmodelles eines fossilen Brandungskliffs und seine interaktive, realistische Visualisierung

2000

Boochs, F.,
Emmermann, K.H.,
MĂĽller, H.

PDF / BibTex

Beiträge zum AGIT-Symposium Salzburg 2000

Im Zuge der fortschreitenden Leistungssteigerungen von Computerhard- und Software finden sich auch auf dem Gebiet der Geowissenschaften in wachsendem Maße Anwendungen, in denen die Dokumentation und Analyse von Geoobjekten nicht mehr allein in-situ am Objekt vorgenommen wird, sondern durch virtuelle Modelle und deren Inspektion am Rechner ergänzt oder sogar ersetzt wird. Die hier präsentierte Arbeit zeigt, wie auf Basis von rein digitalen Daten und weitestgehend automatisiert detaillierte digitale Objektmodelle erzeugt und für die realistische interaktive Visualisierung im Computer aufbereitet werden können. Die Verfahrensweise wird am konkreten Beispiel eines entwicklungsgeschichtlich bedeutsamen Geotops dokumentiert.


Ein Verfahren zur subpixelgenauen gegenseitigen geometrischen Anpassung von Multispektralszenen.

2000

Boochs, F.

PDF / BibTex

n.A.

In the following article a solution will be presented which is designed for the mutual geometric restitution of multispectral satellite images with subpixel accuracy. The chosen technique is found on an area based matching procedure using a local description of geometric distortions between the images. The process generates a grid of corresponding points covering the common area of the images. By means of this grid the content of the image to be referenced is transformed into the other one.
The procedure is applicable to data sets coming from multiple sensors or multiple dates. Motivation for the development, the structure of the algorithm and some results of practical examples are shown in the article.


Precise Target Location Using Image Matching Technique.

1999

Boochs, F.,
Heinz, G.

PDF / BibTex

n.A.
An algorithmic concept is presented using an image matching technique to solve a task in the field of industrial metrology. Aim of the procedure is to automatically locate targets in metric images under difficult practical conditions. The algorithm has to substitute human knowledge, which is normally used in the process of manual measurements and is necessary to establish an
accurate and reliable procedure. In the case presented here some things are known in advance allowing to control the image processing in a way, that no knowledge based technique has to be used. The conception is presented together with practical results documenting the equivalence of the algorithm and the human operator in terms of reliability and precision.

Determination and Interactive Visualisation of 3D-Objects.

1998

Boochs, F.,
Garnica, C.,
Wolter, F.

BibTex

ISPRS Commission V, Symposium, Hakodate, Japan, 1998. International Archives of Photogrammetry and Remote Sensing, Vol. XXXII, Part 5, pp. 316-322.

The paper describes a procedure designed for the determination and visualization of surfaces from objects having full 3D-extent. The procedure is based on digital images captured from all sides around the object. The images will be triangulated and evaluated by means of image matching techniques, resulting in the generation of a large number of individual surface points densely scattered over the object surface. From this point field, the surface will be derived by triangulating all points into a TIN data structure. When the data structure is established, attribute information is incorporated, describing aspects being of interest for further usage of the data. Finally, the object surface will be visualized interactively, allowing for a user controlled inspection of the object. The visualization software is based on graphic standards and allows to display the object in 3D-perspectives which are generated from the object geometry, the visual information of the digital images and the coded presentation of the attribute values.


3D-Vermessung geschlossener Körper.

1998

Boochs, F.,
Garnica, C.

BibTex

Bericht zum Projekt mit der FKZ 1702596 der Arbeitsgemeinschaft industrieller Forschungsvereinigungen.

Die Aufgabe des Projektes bestand in der Entwicklung eines Verfahrens, mit dessen Hilfe Techniken zur Bestimmung digitaler Objektmodelle dahingehend erweitert werden sollten, daß eine präzise geometrische Erfassung von Körpern mit im Raum geschlossenen Oberflächen erreicht wird. Neben der Schaffung der grundsätzlichen Möglichkeiten zur Bestimmung der Oberfläche selbst sollte auch die visuelle Darstellung des Objektes hinsichtlich seiner räumlichen Gestalt, seiner Oberflächenbeschaffenheit und anderer für den Anwender nützlicher Merkmale realisiert werden.


Optisch-mechanische Messungen beim Bau groĂźer Satellitenantennen

1997

Boochs, F.,
Reiser, R.

BibTex

DVW-Seminar Ingenieurvermessung

Vollautomatische Orientierung digitaler Messbilder in einem terrestrischen Anwendungsfall

1997

Boochs, F.,
Heinz, G.

BibTex

n.A.

Vermessung und Visualisierung der Oberfläche einer römischen Büste mit Methoden der Geoinformatik.

1997

Boochs, F.,
Garnica, C.,
Heinz, G.

BibTex

FH Mainz Forum 1/97, S. 19-23.

Die präzise und vollständige geometrische Erfassung von Objekten jeglicher Art wie auch deren Visualisierung und metrisch korrekte Abbildung ist eine der wesentlichen Aufgaben des Vermessungswesen (bzw. Geodäsie: Wissenschaft von der Ausmessung und Abbildung der Erdoberfläche). Üblicherweise hat man es dabei mit dem Objekt Erde (Geo-) und den damit fest verbundenen Teilen zu tun. Die Arbeitstechniken lassen sich allerdings auch auf andere Objekte anwenden, deren Oberfläche metrisch exakt beschrieben werden muß. Dies gilt besonders, wenn zur Vermessung digitale Datensätze gewonnen und rechnergestützte Verfahrenstechniken eingesetzt werden können.
Das vorliegende Beispiel dokumentiert einen Anwendungsfall, der die Einsatzmöglichkeiten von Vermessungsmethoden auf dem Gebiet der Archäologie beschreibt. Insbesondere stehen neue Techniken im Mittelpunkt, die hinsichtlich der Datenerfassung mit digitalen Bilddatensätzen und bezüglich der Objektpräsentation mit digitalen Vektor- und Rasterdatensätzen arbeiten. Die vollständige metrische und inhaltliche Beschreibung des Objektes erfolgt unter Verwendung eines digitalen Objektmodelles, das eine numerische Codierung der Oberfläche bedeutet. Zur Codierung wird eine große Menge einzelner, in der Oberfläche liegender Objektpunkte verwendet, deren Koordinaten vermessen und zusammen mit topologischer und Sachinformation in einer geeigneten Datenstruktur abgelegt werden.
Durch den so gewählten Lösungsweg wird die Anwendung auch zum typischen Beispiel für den Einsatz von Methoden der Geoinformatik, die benötigt werden, um Objekte in geeigneter Weise numerisch codieren zu können. Neben den zentralen Fragen der Datenstrukturen, der Verwaltung und des Umgangs mit objektbezogenen Daten spielen dabei natürlich auch die Vermessungstechniken eine wichtige Rolle, mit deren Hilfe die Objektbeschreibung gewonnen wird.
Der Aufsatz soll einen Einblick in diese Thematik geben und am konkreten Beispiel die verschiedenen Verfahrensschritte beschreiben.


Digital Landscape Model for Europe (DLME).

1997

Blau, E.,
Boochs, F.,
Schulz, B.S.

BibTex

n.A.

Generation and Use of Digital Surface Models for Volume Objects.

1996

Boochs, F.,
Heinz, G.

BibTex

International Archives of Photogrammetry and Remote Sensing, Volume XXXI, Part B3, Commission III. Published by the Committee of the XVIII International Congress for Photogrammetry and Remote Sensing, pp. 70-76.

The paper shows the conception and the achieved results for an archaelogical project aiming at the description and reproduction of a 3D surface body by means of digital photogrammetric techniques. Therein it is of main interest, to make full use of the 3D characteristic of the object surface. That means the collection, storage, organization and extraction of all discrete surface points as individual 3D elements within a unique 3D coordinate frame. The paper shows the actual stage of development, allowing for the complete description of the body surface and the use of the data for visualization purposes.

The data collection will be done by application of an image matching process onto each stereo model, resulting in a local Z=Z(X,Y) description. Due to the known geometric relation to the object bounded coordinate frame the local surface description can be transformed into a S=S(X,Y,Z) representation, taking some qualtity measures and geometrical parameters as additional attributes. Finally all transformed data sets will be merged into a unique object description, taking into account the supression or aggregation of individual point data within the overlapping areas.

As actual use of the surface data some graphical reproductions will be shown, using a selection process collecting all individual points which have to be considered, followed by the necessary geometric and radiometric transformations to achieve the desired surface representation.
 


Towards a Knowledge Model to Document and Select Algorithms and Processes in Cultural Heritage.

0

Boochs, F.,
Reich, T.,
Trémeau, A.,
Karmacharya, A.,
Heinz, G.,
Kato, Z.,
Tamas, L.,
Karaszewski, M.,
Gerke, M.,
Murphy, O.

BibTex

Traitement et Analyse de l’Information Méthodes et Applications, TAIMA, Hammamed, Tunisia, 11-16 May 2015

Studentische Projekte

Florin Aubele,
Andreas Salden

LINK

Die hier vorgestellte Projektarbeit ist im Wintersemester 2012/2013 im Studiengang Geoinformatik und Vermessung M.Sc. an der Fachhochschule Mainz entstanden. Im Rahmen dieser Arbeit…


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