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检索条件"任意字段=Conference on 3D Virtual Reconstruction and Visualization of Complex Architectures"

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3d POINT CLOUd MOdEL COLORIZATION BY dENSE REGISTRATION OF dIGITAL IMAGES 6

3D POINT CLOUD MODEL COLORIZATION BY DENSE REGISTRATION OF D...

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conference on 3d-Arch 2015 - 3d virtual reconstruction and visualization of complex architectures

作者： Crombez, N. Caron, G. Mouaddib, E. Univ Picardie MIS Lab F-80039 Amiens 1 France

ISBN: (纸本)9781629935201

Architectural heritage is a historic and artistic property which has to be protected, preserved, restored and must be shown to the public. Modern tools like 3d laser scanners are more and more used in heritage documentation. Most of the time, the 3d laser scanner is completed by a digital camera which is used to enrich the accurate geometric informations with the scanned objects colors. However, the photometric quality of the acquired point clouds is generally rather low because of several problems presented below. We propose an accurate method for registering digital images acquired from any viewpoints on point clouds which is a crucial step for a good colorization by colors projection. We express this image-to-geometry registration as a pose estimation problem. The camera pose is computed using the entire images intensities under a photometric visual and virtual servoing (VVS) framework. The camera extrinsic and intrinsic parameters are automatically estimated. Because we estimates the intrinsic parameters we do not need any informations about the camera which took the used digital image. Finally, when the point cloud model and the digital image are correctly registered, we project the 3d model in the digital image frame and assign new colors to the visible points. The performance of the approach is proven in simulation and real experiments on indoor and outdoor datasets of the cathedral of Amiens, which highlight the success of our method, leading to point clouds with better photometric quality and resolution.

关键词： Point clouds virtual and Visual Servoing Images Registration Colorization

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IMAGE ACQUISITION ANd MOdEL SELECTION FOR MULTI-VIEW STEREO

IMAGE ACQUISITION AND MODEL SELECTION FOR MULTI-VIEW STEREO

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conference on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Wenzel, K. Rothermel, M. Fritsch, d. Haala, N. Univ Stuttgart Inst Photogrammetry D-70174 Stuttgart Germany

ISBN: (纸本)9781629935201

dense image matching methods enable efficient 3d data acquisition. digital cameras are available at high resolution, high geometric and radiometric quality and high image repetition rate. They can be used to acquire imagery for photogrammetric purposes in short time. Photogrammetric image processing methods deliver 3d information. For example, Structure from Motion reconstruction methods can be used to derive orientations and sparse surface information. In order to retrieve complete surfaces with high precision, dense image matching methods can be applied. However, a key challenge is the selection of images, since the image network geometry directly impacts the accuracy, as well as the completeness of the point cloud. Thus, the image stations and the image scale have to be selected according carefully to the accuracy requirements. Furthermore, most dense image matching solutions are based on multi-view stereo algorithms, where the matching is performed between selected pairs of images. Thus, stereo models have to be selected from the available dataset in respect to geometric conditions, which influence completeness, precision and processing time. Within the paper, the selection of images and the selection of optimal stereo models are discussed according to to photogrammetric surface acquisition using dense image matching. For this purpose, impacts of the acquisition geometry are evaluated for several datasets. Based on the results, a guideline for the acquisition of imagery for photogrammetric surface acquisition is presented. The simple and efficient capturing approach with "One panorama each step" ensures complete coverage and sufficiently redundant observations for a surface reconstruction with high precision and reliability.

关键词： Photogrammetry Surface reconstruction Multi-View Stereo dense Image Matching Structure from Motion

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PROBABILISTIC reconstruction OF ORTHOdOX CHURCHES FROM PRECISION POINT CLOUdS USING BAYESIAN NETWORKS ANd CELLULAR AUTOMATA

PROBABILISTIC RECONSTRUCTION OF ORTHODOX CHURCHES FROM PRECI...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Chizhova, M. Korovin, d. Gurianov, A. Brodovskii, M. Brunn, A. Stilla, U. Luhmann, T. Univ Appl Sci Wurzburg Schweinfurt Rontgenring 8 D-97070 Wurzburg Germany Ivanovo State Univ Power Engn Rabfakovskaya Str 34 Ivanovo 153003 Russia Ivanovo State Univ Ermak Str 39 Ivanovo 153025 Russia Ivanovo State Univ Power Engn Rabfakovskaya Str 34 Ivanovo 153003 Russia Tech Univ Munich Arcisstr 21 D-80333 Munich Germany Jade Univ Appl Sci Wilhelmshaven Oldenburg Elsfle Ofener Str 16 D-26121 Oldenburg Germany

The point cloud interpretation and reconstruction of 3d-buildings from point clouds has already been treated for a few decades. There are many articles which consider the different methods and workows of the automatic detection and reconstruction of geometrical objects from point clouds. Each method is suitable for the special geometry type of object or sensor. General approaches are rare. In our work we present an algorithm which develops the optimal process sequence of the automatic search, detection and reconstruction of buildings and building components from a point cloud. It can be used for the detection of the set of geometric objects to be reconstructed, independent of its destruction. In a simulated example we reconstruct a complete Russian-orthodox church starting from the set of detected structural components and reconstruct missing components with high probability.

关键词： reconstruction from point cloud cellular automaton Bayesian network orthodox churches

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STUdY OF dIFFERENT APPROACHES TO PHOTOREALISTIC MOdELLING ANd RENdERING OF complex SURFACES 9

STUDY OF DIFFERENT APPROACHES TO PHOTOREALISTIC MODELLING AN...

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9th International Workshop on 3d-ARCH 3d virtual reconstruction and visualization of complex architectures

作者： dellarovere, T. Koehl, M. Rodrigues, J. Univ Strasbourg CNRS UMR 7357 INSA StrasbourgICube LabPhotogrammetry & Geomat F-67000 Strasbourg France

Schwarzenburg Castle is one of the few Alsatian castles that can be dated with precision. The Schwarzenbourg family, taking advantage of a favourable historical and political context, built the castle in 1261 on the municipal boundary of the town of Munster. Initially intended for residential use, the castle passed through the centuries from family to family, and shortly becoming a ruin. The first major renovation was realized in the 15th century, but for military purposes rather than for housing. This was the only one, as the castle was quickly abandoned at the end of the same century. It was only during the First World War that the castle was used by the German army, which built a bunker in the upper courtyard. Schwarzenbourg castle is, therefore, an original in Alsace, both in terms of its history and its characteristics, which have no regional equal. The objective of this modelling project is twofold. On the one hand, to model the current state of the castle, i.e., an advanced state of ruin for certain elements, and, on the other hand, to model the reconstruction of the castle as it was when it was built in 1261. This double objective comes up against several problems, mainly technical. Indeed, how to move from a point cloud of a certain density and quality to a surface model allowing a realistic rendering? How to limit the influence of the noise on the quality of the surface model? How to remain faithful to the cloud while simplifying the geometric primitives to make the rendering more efficient? Or what technique should be used to reconstitute the castle as it was when it was built? The objective here was to realize the transformation from a consolidated and geo-referenced point cloud to a surface model allowing for a photo-realistic rendering.

关键词： Heritage Castle 3d modelling Historical constraints Extraction Realistic rendering

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SEEING AMONG FOLIAGE WITH LIdAR ANd MACHINE LEARNING: TOWARdS A TRANSFERABLE ARCHAEOLOGICAL PIPELINE 9

SEEING AMONG FOLIAGE WITH LIDAR AND MACHINE LEARNING: TOWARD...

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9th International Workshop on 3d-ARCH 3d virtual reconstruction and visualization of complex architectures

作者： Mazzacca, G. Grilli, E. Cirigliano, G. P. Remondino, F. Campana, S. Bruno Kessler Fdn FBK 3D Opt Metrol 3DOM unit Trento Italy Univ Siena Ctr Geotechnol Siena Italy Univ Siena Dept Hist & Cultural Heritage Siena Italy

Airborne LidAR technology has become an essential tool in archaeology during the last two decades since it allows archaeologists to measure and map items or structures that would otherwise be hidden under vegetation. In order to detect and characterise the archaeological evidence, it is a common practice to extract accurate digital terrain models (dTM) by filtering out the vegetation from Airborne Laser Scanning (ALS) datasets. Although previous approaches have performed well in ALS filtration, they are still subject to several variables (flight height, forest cover, type of sensors utilised, etc.) and are frequently integrated into expensive commercial software or customised for specific locations. This study presents a workflow for treating ALS archaeological datasets using machine learning algorithms for both filtering the vegetation and detecting hidden structures. The workflow is applied to two different archaeological environments (in terms of structures, vegetation, landscape, point density), and results demonstrate that the pipeline is rapid and accurate, and the prediction model is transferable.

关键词： point cloud classification machine learning remote sensing landscape archaeology

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virtual HERITAGE FOR THE dISSEMINATION OF THE BARATTI IN 3d PROJECT 8

VIRTUAL HERITAGE FOR THE DISSEMINATION OF THE BARATTI IN 3D ...

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8th International Workshop on 3d virtual reconstruction and visualization of complex architectures (3d-ARCH)

作者： Nicastro, G. Puma, P. Univ Florence Dept Architecture I-50121 Florence Italy

The paper describes the final step of the Baratti in 3d project, aimed at the dissemination of the important archaeological heritage of the Etruscan city of Populonia (Tuscany, Italy). The chain of "data metrical surveying - 2d and 3d representation communication" has been applied on the "Princes's tombs" of the monumental necropolis of San Cerbone and its finds to provide a detailed description of their context, workmanship, morphological characteristics and materials to realize the virtual recreation. The preservation of the finds from the excavations in two different museums far from the archaeological area (the Museo Archeologico Nazionale di Firenze and the Museo Archeologico del Territorio di Populonia, in Piombino) makes the understanding of the original context very difficult for visitors. Thus the "Baratti in 3d Project" has been conceived in order to document the tombs, their finds and produce the "virtual match" showing in its entirety the environmental and architectural provenance and material ritual context and in order to display in innovative visual approach this archaeological heritage. To complement the interactive platform, as a physical fallout of this project has been realized "A museum in every sense", a permanent exhibition in the Museo Archeologico del Territorio di Populonia.

关键词： virtual archaeology archaeological survey digital representation Populonia's monumental necropolis

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TECHNIQUES FOR REVEALING 3d HIddEN ARCHEOLOGICAL FEATURES: MORPHOLOGICAL RESIdUAL MOdELS AS virtual-POLYNOMIAL TEXTURE MAPS 6

TECHNIQUES FOR REVEALING 3D HIDDEN ARCHEOLOGICAL FEATURES: M...

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conference on 3d-Arch 2015 - 3d virtual reconstruction and visualization of complex architectures

作者： Pires, Hugo Martinez Rubio, Jose Elorza Arana, Artzai Univ Porto CICGE Res Ctr Geospace Sci P-4100 Oporto Portugal Univ Valladolid LFA DAVAP E-47002 Valladolid Spain Univ Salamanca E-37008 Salamanca Spain

ISBN: (纸本)9781629935201

The recent developments in 3d scanning technologies are not been accompanied by visualization interfaces. We are still using the same types of visual codes as when maps and drawings were made by hand. The available information in 3d scanning data sets is not being fully exploited by current visualization techniques. In this paper we present recent developments regarding the use of 3d scanning data sets for revealing invisible information from archaeological sites. These sites are affected by a common problem, decay processes, such as erosion, that never ceases its action and endangers the persistence of last vestiges of some peoples and cultures. Rock art engravings, or epigraphical inscriptions, are among the most affected by these processes because they are, due to their one nature, carved at the surface of rocks often exposed to climatic agents. The study and interpretation of these motifs and texts is strongly conditioned by the degree of conservation of the imprints left by our ancestors. Every single detail in the remaining carvings can make a huge difference in the conclusions taken by specialists. We have selected two case-studies severely affected by erosion to present the results of the on-going work dedicated to explore in new ways the information contained in 3d scanning data sets. A new method for depicting subtle morphological features in the surface of objects or sites has been developed. It allows to contrast human patterns still present at the surface but invisible to naked eye or by any other archaeological inspection technique. It was called Morphological Residual Model (MRM) because of its ability to contrast the shallowest morphological details, to which we refer as residuals, contained in the wider forms of the backdrop. Afterwards, we have simulated the process of building Polynomial Texture Maps - a widespread technique that as been contributing to archaeological studies for some years - in a 3d virtual environment using the results of MRM ca

关键词： Morphological Residual Model Archaeology Engravings 3d Polynomial Texture Mapping

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Structural Simulations and Conservation Analysis - Historic Building Information Model (HBIM) 6

Structural Simulations and Conservation Analysis - Historic ...

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conference on 3d-Arch 2015 - 3d virtual reconstruction and visualization of complex architectures

作者： dore, C. Murphy, M. McCarthy, S. Brechin, F. Casidy, C. dirix, E. Dublin Inst Technol Sch Surveying & Construct Management Dublin Ireland KU Leuven Univ Leuven Raymond Lemaire Int Ctr Conservat Fac Engn Leuven Belgium

ISBN: (纸本)9781629935201

In this paper the current findings to date of the Historic Building Information Model (HBIM) of the Four Courts in dublin are presented. The Historic Building Information Model (HBIM) forms the basis for both structural and conservation analysis to measure the impact of war damage which still impacts on the building. The laser scan survey was carried out in the summer of 2014 of the internal and external structure. After registration and processing of the laser scan survey, the HBIM was created of the damaged section of the building and is presented as two separate workflows in this paper. The first is the model created from historic data, the second a procedural and segmented model developed from laser scan survey of the war damaged drum and dome. From both models structural damage and decay simulations will be developed for documentation and conservation analysis.

关键词： Historic Building Information Modelling HBIM Surveying Historic Structures Building Conservation Architectural Conservation Laser Scanning virtual Cultural Heritage

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COMPARISON OF COMMERCIAL STRUCTURE-FROM-MOTION PHOTOGRAMMETY SOFTWARE USEd FOR UNdERWATER THREE-dIMENSIONAL MOdELING OF CORAL REEF ENVIRONMENTS

COMPARISON OF COMMERCIAL STRUCTURE-FROM-MOTION PHOTOGRAMMETY...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Burns, J. H. R. delparte, d. Univ Hawaii Manoa Hawaii Inst Marine Biol POB 1346 Kaneohe HI 96722 USA Idaho State Univ Dept Geosci 921 S 8th AveSTOP 8072 Pocatello ID 83209 USA

Structural complexity in ecosystems creates an assortment of microhabitat types and has been shown to support greater diversity and abundance of associated organisms. The 3d structure of an environment also directly affects important ecological parameters such as habitat provisioning and light availability and can therefore strongly influence ecosystem function. Coral reefs are architecturally complex 3d habitats, whose structure is intrinsically linked to the ecosystem biodiversity, productivity, and function. The field of coral ecology has, however, been primarily limited to using 2- dimensional (2d) planar survey techniques for studying the physical structure of reefs. This conventional approach fails to capture or quantify the intricate structural complexity of corals that influences habitat facilitation and biodiversity. A 3-dimensional (3d) approach can obtain accurate measurements of architectural complexity, topography, rugosity, volume, and other structural characteristics that affect biodiversity and abundance of reef organisms. Structure-from-Motion (SfM) photogrammetry is an emerging computer vision technology that provides a simple and cost-effective method for 3d reconstruction of natural environments. SfM has been used in several studies to investigate the relationship between habitat complexity and ecological processes in coral reef ecosystems. This study compared two commercial SfM software packages, Agisoft Photoscan Pro and Pix4dmapper Pro 3.1, in order to assess the cpaability and spatial accuracy of these programs for conducting 3d modeling of coral reef habitats at three spatial scales.

关键词： Coral Reefs Coral Ecology Habitat Photogrammetry Structure-from-Motion Structural complexity 3d topographic reconstruction 3d underwater modeling Agisoft Photoscan Pix4d

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RECOVERING OLd STEREOSCOPIC NEGATIVES ANd PROdUCING dIGITAL 3d MOdELS OF FORMER APPEARANCES OF HISTORIC BUILdINGS

RECOVERING OLD STEREOSCOPIC NEGATIVES AND PRODUCING DIGITAL ...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Miranda, A. Rodriguez Melon, J. M. Valle Univ Basque Country UPV EHU Lab Geometr Documentat Heritage Vitoria Spain

Three-dimensional models with photographic textures have become a usual product for the study and dissemination of elements of heritage. The interest for cultural heritage also includes evolution along time;therefore, apart from the 3d models of the current state, it is interesting to be able to generate models representing how they were in the past. To that end, it is necessary to resort to archive information corresponding to the moments that we want to visualize. This text analyses the possibilities of generating 3d models of surfaces with photographic textures from old collections of analog negatives coming from works of terrestrial stereoscopic photogrammetry of historic buildings. The case studies presented refer to the geometric documentation of a small hermitage (done in 1996) and two sections of a wall (year 2000). The procedure starts with the digitization of the film negatives and the processing of the images generated, after which a combination of different methods for 3d reconstruction and texture wrapping are applied: techniques working simultaneously with several images (such as the algorithms of Structure from Motion - SfM) and single image techniques (such as the reconstruction based on vanishing points). Then, the features of the obtained models are described according to the geometric accuracy, completeness and aesthetic quality. In this way, it is possible to establish the real applicability of the models in order to be useful for the aforementioned historical studies and dissemination purposes. The text also wants to draw attention to the importance of preserving the documentary heritage available in the collections of negatives in archival custody and to the increasing difficulty of using them due to: (1) problems of access and physical conservation, (2) obsolescence of the equipment for scanning and stereoplotting and (3) the fact that the software for processing digitized photographs is discontinued.

关键词： 3d modelling Old photographs Film negatives Structure from Motion (SfM) Perspective geometry Monoscopic methods in photogrammetry

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