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4th ISPRS International Workshop 3d-ARCH - 3d virtual reconstruction and visualization of complex architectures

作者： Wilson, L. Rawlinson, A. Mitchell, d. S. Pritchard, d. K. McGregor, H. C. Hist Scotland Edinburgh EH9 1SH Midlothian Scotland Glasgow Sch Art Digital Design Studio Glasgow G51 1EA Lanark Scotland

The Scottish Ten project seeks to digitally document World Heritage Sites in Scotland and culturally significant international heritage sites, using technologies such as terrestrial laser scanning, aerial LidAR, high resolution photography, digital photogrammetry, high-accuracy GPS and digital total stations. The project has numerous aims, centering around conservation, cultural heritage management, promoting Scotland's technical and scientific expertise and Scottish cultural connections. This paper focuses on the recent 3d survey work in the Heart of Neolithic Orkney World Heritage Site in Scotland. Two principal sites, Skara Brae and Maeshowe, are described, the methodologies undertaken and the results so far. Aside from generating accurate survey records, data will be utilised for analysis and interpretation, monitoring, visualisation and numerous other purposes. Although the data is still at the early stages of processing, the paper highlights the significant potential of 3d survey for understanding and managing the Heart of Neolithic Orkney and the benefits of 3d survey for cultural heritage applications in general.

关键词： Scottish Ten cultural heritage terrestrial laser scanning georeferencing recording analysis monitoring visualisation

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FROM REAL TO ..." REAL". A REVIEW OF GEOMATIC ANd RAPId PROTOTYPING TECHNIQUES FOR SOLId MOdELLING IN CULTURAL HERITAGE FIELd 4

FROM REAL TO ..." REAL". A REVIEW OF GEOMATIC AND RAPID PROT...

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4th ISPRS International Workshop 3d-ARCH - 3d virtual reconstruction and visualization of complex architectures

作者： Tucci, G. Bonora, V. Univ Florence GECO Lab Geomat & Commun DiCR I-50121 Florence Italy

The documentation and 3d modelling of Cultural Heritage are now mainly based on digital techniques to produce complete, detailed and photorealistic three-dimensional surveys. The integration of various technologies and sensors is the best solution to obtain results with these characteristics. According to the reproduction scale, you need to change the characteristics of the instruments used during acquisition. Reduced or real scale solid models are an effective support for projects involving communication and divulgation: they can be understood without the intermediation of data processing systems, therefore increasing the potential users. Additive Manufacturing (AM) is an expression indicative of technologies used to fabricate physical objects directly from CAd data sources;they are also called three-dimensional printing, solid freeform fabrication or layered manufacturing. The paper analyzes only factors related to the processing that involves the superficial aspect of the solid model;some important aspects useful in other applications, e g. mechanical behaviour of the used material or the method to realize the internal structure or possible supports of the model, are neglected.

关键词： Rapid prototyping Additive Manufacturing Architectural Model Solid Model 3d scanner

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reconstruction and visualization of 3d models of colonic surface

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE 1997年第3期44卷 1297-1302页

作者： Hong, LC Liang, ZG Viswambharan, A Kaufman, A Wax, M SUNY STONY BROOK CTR VISUAL COMP DEPT RADIOL STONY BROOK NY 11794 USA

This paper presents an innovative technology called 3d virtual colonoscopy, which incorporates several advanced visualization techniques to enable the physician to virtually examine the inner surface of the entire colon for identifying and inspecting colonic polyps. We first describe our unique process of acquiring and reconstructing a patient's colon model, followed by the novel visualization algorithms that we have developed to provide automatic planned navigations as well as interactive guided navigations inside the colon. Finally, we present our experimental results on a simulated pipe phantom, the Visible Human data set, and patient data.

关键词： Three dimensions Otolaryngologists visualization Computed Tomographic Colonography dataset Colonic Polyps inner surface Colon

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Semantic Scene reconstruction using the denseCRF Model 7

Semantic Scene Reconstruction using the DenseCRF Model

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7th International conference on virtual Reality and visualization (ICVRV)

作者： Ma, Zhixin Cao, Chong Shen, Xukun Beihang Univ State Key Lab Virtual Real Technol & Syst Beijing Peoples R China

ISBN: (纸本)9781538626368

With the rapid growth of virtual reality industry, fast and accurate algorithms for scene reconstruction and understanding became the research focus in related fields. Traditional methods always consider the 3d model and scene understanding as two problems and work them out separately. In this paper, we propose a new method to reconstruct semantic 3d models from multi-view images. This method not only contains information of points in 3d space, but also builds up their relationship with pixels from images. We commit experiments on four real challenging datasets to test the effectiveness of our proposed method. The reconstruction can be directly applied to virtual reality applications, such as roaming in 3d scenes.

关键词： virtual reality semantic reconstruction image segmentation dense 3d modeling

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IMAGE-BASEd ANd RANGE-BASEd 3d MOdELLING OF ARCHAEOLOGICAL CULTURAL HERITAGE: THE TELAMON OF THE TEMPLE OF OLYMPIAN ZEUS IN AGRIGENTO (ITALY) 4

IMAGE-BASED AND RANGE-BASED 3D MODELLING OF ARCHAEOLOGICAL C...

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4th ISPRS International Workshop 3d-ARCH - 3d virtual reconstruction and visualization of complex architectures

作者： Lo Brutto, M. Spera, M. G. Univ Palermo Dept Civil Environm & Aerosp Engn I-90128 Palermo Italy

The Temple of Olympian Zeus in Agrigento (Italy) was one of the largest temple and at the same time one of the most original of all the Greek architecture. We don't know exactly how it was because the temple is now almost completely destroyed but it is very well-known for the presence of the Telamons. The Telamons were giant statues (about 8 meters high) probably located outside the temple to fill the interval between the columns. In accordance with the theory most accredited by archaeologists the Telamons were a decorative element and also a support for the structure. However, this hypothesis has never been scientifically proven. One Telamon has been reassembled and is shown at the Archaeological Museum of Agrigento. In 2009 a group of researchers at the University of Palermo has begun a study to test the hypothesis that the Telamons support the weight of the upper part of the temple. The study consists of a 3d survey of the Telamon, to reconstruct a detailed 3d digital model, and of a structural analysis with the Finite Element Method (FEM) to test the possibility that the Telamon could to support the weight of the upper portion of the temple. In this work the authors describe the 3d survey of Telamon carry out with Range-Based Modelling (RBM) and Image-Based Modeling (IBM). The RBM was performed with a TOF laser scanner while the IBM with the ZScan system of Menci Software and Image Master of Topcon. Several tests were conducted to analyze the accuracy of the different 3d models and to evaluate the difference between laser scanning and photogrammetric data. Moreover, an appropriate data reduction to generate a 3d model suitable for FEM analysis was tested.

关键词： Cultural Heritage 3d Modelling Image Matching Laser scanning Close Range

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3d Modeling for Rock Art documentation using Lightweight Multispectral Camera 8

3D Modeling for Rock Art Documentation using Lightweight Mul...

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

作者： Zainuddin, K. Majid, Z. Ariff, M. F. M. Idris, K. M. Abbas, M. A. darwin, N. Univ Teknol MARA Ctr Study Surveying Sci & Geomat Fac Architecture Planning & Surveying Shah Alam Malaysia Univ Teknol Malaysia Geospatial Imaging & Informat Res Grp Johor Baharu Malaysia

This paper discusses the use of the lightweight multispectral camera to acquire three-dimensional data for rock art documentation application. The camera consists of five discrete bands, used for taking the motifs of the rock art paintings on a big structure of a cave based on the close-range photogrammetry technique. The captured images then processed using commercial structure-from-motion photogrammetry software, which automatically extracts the tie point. The extracted tie points were then used as input to generate a dense point cloud based on the multi-view stereo (MVS) and produced the multispectral 3d model, and orthophotos in a different wavelength. For comparison, the paintings and the wall surface also observed by using terrestrial laser scanner which capable of recording thousands of points in a short period of time with high accuracy. The cloud-to-cloud comparison between multispectral and TLS 3d point cloud show a sub-cm discrepancy, considering the used of the natural features as control target during 3d construction. Nevertheless, the processing also provides photorealistic orthophoto, indicates the advantages of the multispectral camera in generating dense 3d point cloud as TLS, photorealistic 3d model as RGB optic camera, and also with the multiwavelength output.

关键词： Rock Art Geometric Recording Multispectral Camera TLS SfM

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POINT CLOUd dERIVEd FROM VIdEO FRAMES: ACCURACY ASSESSMENT IN RELATION TO TERRESTRIAL LASER SCANNING ANd dIGITAL CAMERA dATA

POINT CLOUD DERIVED FROM VIDEO FRAMES: ACCURACY ASSESSMENT I...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： delis, P. Zacharek, M. Wierzbicki, d. Grochala, A. Mil Univ Technol Fac Civil Engn & Geodesy Dept Remote Sensing Photogrammetry & Imagery Inte Geodesy Inst Warsaw Poland

The use of image sequences in the form of video frames recorded on data storage is very useful in especially when working with large and complex structures. Two cameras were used in this study: Sony NEX-5N (for the test object) and Sony NEX-VG10 E (for the historic building). In both cases, a Sony alpha f = 16 mm fixed focus wide-angle lens was used. Single frames with sufficient overlap were selected from the video sequence using an equation for automatic frame selection. In order to improve the quality of the generated point clouds, each video frame underwent histogram equalization and image sharpening. Point clouds were generated from the video frames using the SGM-like image matching algorithm. The accuracy assessment was based on two reference point clouds: the first from terrestrial laser scanning and the second generated based on images acquired using a high resolution camera, the NIKON d800. The performed research has shown, that highest accuracies are obtained for point clouds generated from video frames, for which a high pass filtration and histogram equalization had been performed. Studies have shown that to obtain a point cloud density comparable to TLS, an overlap between subsequent video frames must be 85% or more. Based on the point cloud generated from video data, a parametric 3d model can be generated. This type of the 3d model can be used in HBIM construction.

关键词： dense image matching 3d modelling data integration image sequence HBIM video frames selection

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MOdELLING ANd ACCURACY IN A BIM ENVIRONMENT FOR PLANNEd CONSERVATION: THE APARTMENT OF TROIA OF GIULIO ROMANO

MODELLING AND ACCURACY IN A BIM ENVIRONMENT FOR PLANNED CONS...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Adami, A. Scala, B. Spezzoni, A. Politecn Milan Polo Mantova Dept ABC Piazza Arco 4 Mantua Italy

Modeling of Cultural Heritage in a BIM environment, and in general of existing buildings, requires special attention because there are two diametrically opposed possibilities. On the one hand the attempt is to realize a very complex and accurate model, in order to provide the most comprehensive representation of the architecture as possible. The opposite position leads to build a very schematic and symbolic model of as-built architecture. It is not easy to determine which is the right balance between these two attitudes because each architecture requires a personalized approach and not standards. It's, however, necessary to find rules to figure out which items are represented, what is the minimum level of detail to consider adequate and how to deal with alterations from simple and linear geometries. These two facing possibilities deal with different goals and tools. In the field of restoration or planned conservation, that is the most common approach for existing buildings, the attention focuses on the exceptions and particularities of each architecture: the important aspect is to understand and describe exactly each part as a singularity (as it is). In this context it is very difficult to find a standard or a common solution. The first possibility of modelling seems to be very close to this approach, but it clashes with two important aspects. A first problem concerns the modelling software. Usually commercial BIM modelling software doesn't allow to realize very complex and high detailed solutions. They prefer working with predefined families and try to categorize each element in standard solution. The possibility to build new families is expected, but it often requires a lot of time. The second difficulty is the real efficiency of such an accurate model. In fact, it could be very difficult to link external elements to the model or use it in many traditional BIM applications. In this paper, we suggest another possible approach that represents the first result of a r

关键词： BIM accuracy 3d modelling HBIM planned conservation restoration

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FOVEON VS BAYER: COMPARISON OF 3d reconstruction PERFORMANCES 8

FOVEON VS BAYER: COMPARISON OF 3D RECONSTRUCTION PERFORMANCE...

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

作者： Vlachos, M. Skarlatos, d. Bodin, P. Cyprus Univ Technol Dept Civil Engn & Geomat POB 50329 CY-3603 Limassol Cyprus Natl Sch Geog Sci ENSG Champs Sur Marne France

The main idea of this particular study was to validate if the new FOVEON technology implemented by sigma cameras can provide better overall results and outperform the traditional Bayer pattern sensor cameras regarding the radiometric information that records as well as the photogrammetric point cloud quality that can provide. Based on that, the scope of this paper is separated into two evaluations. First task is to evaluate the quality of information reconstructed during de-mosaicking step for Bayer pattern cameras by detecting potential additional colour distortion added during the de-mosaicking step, and second task is the geometric comparisons of point clouds generated by the photos by Bayer and FOVEON sensors against a reference point cloud. The first phase of the study is done using various de-mosaicking algorithms to process various artificial Bayern pattern images and then compare them with reference FOVEON images. The second phase of the study is carried on by reconstructing 3d point clouds of the same objects captured by a Bayer and a FOVEON sensor respectively and then comparing the various point clouds with a reference one, generated by a structured light hand-held scanner. The comparison is separated into two parts, where initially we evaluate five separate point clouds (RGB, Gray, Red, Green, Blue) for each camera sensor per site and then a second comparison is evaluated on colour classified RGB point cloud segments.

关键词： Photogrammetry Bayer pattern accuracy de-mosaicking point cloud structure light scanner

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A RANGE BASEd METHOd FOR complex FACAdE MOdELLING 4

A RANGE BASED METHOD FOR COMPLEX FACADE MODELLING

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4th ISPRS International Workshop 3d-ARCH - 3d virtual reconstruction and visualization of complex architectures

作者： Adami, A. Fregonese, L. Taffurelli, L. Univ Iuav Venice Photogrammetry Lab Lab Syst Venice Italy Politecn Milan BEST Grp Larifo Milan Italy

3d modelling of Architectural Heritage does not follow a very well-defined way, but it goes through different algorithms and digital form according to the shape complexity of the object, to the main goal of the representation and to the starting data. Even if the process starts from the same data, such as a pointcloud acquired by laser scanner, there are different possibilities to realize a digital model. In particular we can choose between two different attitudes: the mesh and the solid model. In the first case the complexity of architecture is represented by a dense net of triangular surfaces which approximates the real surface of the object. In the other -opposite- case the 3d digital model can be realized by the use of simple geometrical shapes, by the use of sweeping algorithm and the Boolean operations. Obviously these two models are not the same and each one is characterized by some peculiarities concerning the way of modelling (the choice of a particular triangulation algorithm or the quasi-automatic modelling by known shapes) and the final results (a more detailed and complex mesh versus an approximate and more simple solid model). Usually the expected final representation and the possibility of publishing lead to one way or the other. In this paper we want to suggest a semiautomatic process to build 3d digital models of the facades of complex architecture to be used for example in city models or in other large scale representations. This way of modelling guarantees also to obtain small files to be published on the web or to be transmitted. The modelling procedure starts from laser scanner data which can be processed in the well known way. Usually more than one scan is necessary to describe a complex architecture and to avoid some shadows on the facades. These have to be registered in a single reference system by the use of targets which are surveyed by topography and then to be filtered in order to obtain a well controlled and homogeneous point cloud of th

关键词： range map height map displacement map 3d modelling

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