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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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THE COMPARISON OF 2d ANd 3d dETECTORS FOR TLS dATA REGISTRATION - PRELIMINARY RESULTS 8

THE COMPARISON OF 2D AND 3D DETECTORS FOR TLS DATA REGISTRAT...

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

作者： Markiewicz, J. S. Markiewicz, L. Forys, P. Fac Geodesy & Cartog Dept Photogrammetry Remote Sensing & Spatial Info Warsaw Poland Warsaw Univ Technol Fac Mechatron Inst Micromech & Photon Virtual Real Tech Div Warsaw Poland

This paper presents the analysis of possible methods of a terrestrial laser scanning (TLS) data registration using 2d/3d detectors and descriptors. The developed approach, where point clouds are processed in form of panoramic images, orthoimages and 3d data, was described. The accuracy of the registration process was preliminary verified. The two approaches were analysed and compared: the 2d SIFT (Scale-Invariant Feature Transform) detector and descriptor with the rasterized TLS data and the 3d SIFT detector with the 3d FPFH (Fast Point Feature Histograms) descriptor. The feature points were found and preliminary matched using the OpenCV and PCL (Point Cloud Library) libraries. In order to find the best point cloud representation for the registration process, both the percentage and distribution of the correctly detected and matched points were analysed. The materials consisted of the point clouds of two chambers from the Museum of King John III's Palace in Wilanow. They were acquired using the Z+F 5006h and 5003 TLS scanners. The performed analysis showed that the lowest RMSE values were for the 2d detectors and orthoimages. However, in the case of the point number and distribution, better results were obtained for using the 3d detector.

关键词： cultural heritage TLS data registration feature-based method 2d and 3d detectors accuracy analysis

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LYNX MOBILE MAPPER FOR SURVEYING CITY CENTERS ANd HIGHWAYS 4

LYNX MOBILE MAPPER FOR SURVEYING CITY CENTERS AND HIGHWAYS

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

作者： Conforti, d. Zampa, F. Optech Inc Vaughan ON Canada Sineco SpA Res & New Technol Dev Liguria Italy

In the last two years the Lynx Mobile Mapper has become the new lidar solution developed for surveying large areas that are impractical with static lidar sensors and require an accuracy and resolution that exceed airborne technologies. The system allows the scanning at a speed up to 100 km/h, obtaining accuracy better than 5 cm with an up to 7 mm resolution. Therefore, this solution proves to be an excellent tool for surveying city centers, highways, railways, thanks also to a very fast, safe and accurate data collection. This paper will present two applications: 1- The survey of the entire ancient city center of Brescia (Italy) with it medieval castle, the narrows streets and the main squares. It also has been run a test to survey with the Lynx the tunnel that go underneath the castle and compare the result with a static laser scanner survey, 2- The survey of the Calatrava Bridge on the A1 highway. The central bridge, which crosses over the high-speed rail line and the A1 motorway is composed as a single symmetrical arch, placed longitudinally, which rises to a height of 46m. during the survey the two A1 motorway carriageways have been scanned and the upper part of the bridge for a complete 3d model of this structure.

关键词： Laser Scanner LidAR Mobile Mapper Lynx

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A COMPARISON AMONG dIFFERENT OPTIMIZATION LEVELS IN 3d MULTI-SENSOR MOdELS. A TEST CASE IN EMERGENCY CONTEXT: 2016 ITALIAN EARTHQUAKE

A COMPARISON AMONG DIFFERENT OPTIMIZATION LEVELS IN 3D MULTI...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Chiabrando, F. Sammartano, G. Spano, A. Politecn Torino DAD I-10129 Turin Italy

In sudden emergency contexts that affect urban centres and built heritage, the latest Geomatics technique solutions must enable the demands of damage documentation, risk assessment, management and data sharing as efficiently as possible, in relation to the danger condition, to the accessibility constraints of areas and to the tight deadlines needs. In recent times, Unmanned Vehicle System (UAV) equipped with cameras are more and more involved in aerial survey and reconnaissance missions, and they are behaving in a very cost-effective way in the direction of 3d documentation and preliminary damage assessment. More and more UAV equipment with low-cost sensors must become, in the future, suitable in every situation of documentation, but above all in damages and uncertainty frameworks. Rapidity in acquisition times and low-cost sensors are challenging marks, and they could be taken into consideration maybe with time spending processing. The paper will analyze and try to classify the information content in 3d aerial and terrestrial models and the importance of metric and non-metric withdrawable information that should be suitable for further uses, as the structural analysis one. The test area is an experience of Team direct from Politecnico di Torino in centre Italy, where a strong earthquake occurred in August 2016. This study is carried out on a stand-alone damaged building in Pescara del Tronto (AP), with a multi-sensor 3d survey. The aim is to evaluate the contribution of terrestrial and aerial quick documentation by a SLAM based LidAR and a camera equipped multirotor UAV, for a first reconnaissance inspection and modelling in terms of level of details, metric and non-metric information.

关键词： emergency mapping 3d documentation Cultural Heritage risk multi-scale modelling multi-sensor approach UAV SfM photogrammetry SLAM information extraction data filtering point cloud post-processing

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GIS-BASEd SURFACE ANALYSIS OF ARCHAEOLOGICAL FINdS 4

GIS-BASED SURFACE ANALYSIS OF ARCHAEOLOGICAL FINDS

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

作者： Kovacs, K. Hanke, K. Moser, M. Univ Innsbruck Inst Basic Sci Civil Engn Surveying & Geoinformat Unit A-6020 Innsbruck Austria

The international research project HiMAT (History of Mining Activities in the Tyrol and adjacent areas) is dedicated to the study of mining history in the Eastern Alps by various scientific disciplines. The aim of this program is the analysis of the mining activities' impacts on environment and human societies. Unfortunately, there is only a limited number of specific regions (e.g. Mitterberg) to offer possibilities to investigate the former mining expansions. Within this multidisciplinary project, the archaeological sites and finds are analyzed by the Surveying and Geoinformation Unit at the University of Innsbruck. This paper shows data fusion of different surveying and post-processing methods to achieve a photo-realistic digital 3d model of one of these most important finds, the Bronze Age sluice box from the Mitterberg. The applied workflow consists of four steps: 1. Point cloud processing, 2. Meshing of the point clouds and editing of the models, 3. Image orientation, bundle and image adjustment, 4. Model texturing. In addition, a short range laser scanning survey was organized before the conservation process of this wooden find. More accurate research opportunities were offered after this detailed documentation of the sluice box, for example the reconstruction of the broken parts and the surface analysis of this archaeological object were implemented using these high-resolution datasets. In conclusion, various unperceived patterns of the wooden boards were visualized by the GIS-based tool marks investigation.

关键词： reconstruction Surface Analysis Tool Marks GIS Laser Scanning

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3d SURVEY OF THE EARLY-MIddLE BRONZE AGE WORKSHOP complex ANd CEMETERY AREA AT ERIMI-LAONIN TOU PORAKOU (CYPRUS) 4

3D SURVEY OF THE EARLY-MIDDLE BRONZE AGE WORKSHOP COMPLEX AN...

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

作者： Tucci, G. Bombardieri, L. Conti, A. Fiorini, L. Univ Florence GeCo Geomat & Commun Cultural Heritage Lab I-50121 Florence Italy Univ Florence KVP Miss Archeol Italiana Erimi Dipartimento Sci Antichita I-50121 Florence Italy

Kouris Valley Project is an archaeological research project held from 2007 by University of Florence and directed by Prof. A. M. Jasink, under the field direction of dr. L. Bombardieri in the Kourion area (Limassol, Cyprus). during the 2010 field season the collaboration of GeCo (Geomatics and Communication for Cultural Heritage Laboratory, University of Florence) was requested with the aim at the laser scanner survey of Erimi-Laonin tou Porakou site area. The survey involved two areas, a workshop and a cemetery, as well as some small ceramic finds. Range maps was used for different aims: to make a full-scale replica of a tomb to exhibit at Limassol museum and for the documentation of the excavation of the workshop. This one is a rather extreme case study: most significant artifacts are shallow carvings into bedrock and could be confused with natural elements. In this case the aim was to get automatic and accurate drawings comparable with traditional ones. The paper reviews the expressive potential of drawings done using different techniques and softwares, each one with its assets and restrictions.

关键词： Archaeology Cultural Heritage CAd Representation Modelling Laser Scanning

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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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NEW INSTRUMENTS FOR SURVEY: ON LINE SOFTWARES FOR 3d reconstruction FROM IMAGES 4

NEW INSTRUMENTS FOR SURVEY: ON LINE SOFTWARES FOR 3D RECONST...

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

作者： de Balestrini, E. Fratus Guerra, F. Univ IUAV Venezia Lab Fotogrammetria Circe I-30135 Venice Italy

3d scanning technologies had a significant development and have been widely used in documentation of cultural, architectural and archeological heritages. Modern methods of three-dimensional acquiring and modeling allow to represent an object through a digital model that combines visual potentialities of images (normally used for documentation) to the accuracy of the survey, becoming at the same time support for the visualization that for metric evaluation of any artefact that have an historical or artistic interest, opening up new possibilities for cultural heritage's fruition, cataloging and study. despite this development, because of the small catchment area and the 3d laser scanner's sophisticated technologies, the cost of these instruments is very high and beyond the reach of most operators in the field of cultural heritages. This is the reason why they have appeared low-cost technologies or even free, allowing anyone to approach the issues of acquisition and 3d modeling, providing tools that allow to create three-dimensional models in a simple and economical way. The research, conducted by the Laboratory of Photogrammetry of the University IUAV of Venice, of which we present here some results, is intended to figure out whether, with Arc3d, it is possible to obtain results that can be somehow comparable, in therms of overall quality, to those of the laser scanner, and/or whether it is possible to integrate them. They were carried out a series of tests on certain types of objects, models made with Arc3d, from raster images, were compared with those obtained using the point clouds from laser scanner. We have also analyzed the conditions for an optimal use of Arc3d: environmental conditions (lighting), acquisition tools (digital cameras) and type and size of objects. After performing the tests described above, we analyzed the patterns generated by Arc3d to check what other graphic representations can be obtained from them: orthophotos and drawings. The research's r

关键词： 3d scanner photogrammetry 3d modeling survey

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FORENSIC ENGINEERING SURVEYS WITH UAV PHOTOGRAMMETRY ANd LASER SCANNING TECHNIQUES 8

FORENSIC ENGINEERING SURVEYS WITH UAV PHOTOGRAMMETRY AND LAS...

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

作者： Cappelletti, C. Boniardi, M. Casaroli, A. de Gaetani, C. I. Passoni, d. Pinto, L. Politecn Milan DMEC Milan Italy Politecn Milan DICA Milan Italy Univ Genoa DICCA Genoa Italy

This work aims at presenting the use of new technologies in the field of forensic engineering. In particular, the use of UAV photogrammetry and laser scanning is compared with the traditional methods of surveying an accident site. In this framework, surveys must be carried out promptly, executed in a short time and performed so that the greatest possible amount of information is collected with sufficient accuracy to avoid the possibility of neglecting details once that the scene is no longer preserved. The combination of modern surveying techniques such UAV photogrammetry and laser scanning can properly fulfill these requirements. An experimental test has been arranged and instruments, procedures, settings, practical limits and results have been evaluated and compared with respect to the usual way of performing the survey for forensic purposes. In particular, both qualitative and quantitative considerations are given, assessing the completeness of the reconstructed model, the statistical evaluation of the errors and the accuracy achieved.

关键词： UAV Photogrammetry Terrestrial Laser Scanning Forensic Engineering Industrial Accidents Survey 3d Imaging Forensic Photography

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RECREATING CULTURAL HERITAGE ENVIRONMENTS FOR VR USING PHOTOGRAMMETRY 8

RECREATING CULTURAL HERITAGE ENVIRONMENTS FOR VR USING PHOTO...

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

作者： dhanda, A. Ortiz, M. Reina Weigert, A. Paladini, A. Min, A. Gyi, M. Su, S. Fai, S. Quintero, M. Santana Carleton Univ CIMS Ottawa ON Canada Katholieke Univ Leuven RLICC Leuven Belgium Dept Archaeol & Natl Museum Bagan Myanmar Mandalay Technol Univ Mandalay Myanmar

In this paper, we propose a workflow for recreating places of cultural heritage in virtual Reality (VR) using structure from motion (SfM) photogrammetry. The unique texture of heritage places makes them ideal for full photogrammetric capture. An optimized model is created from the photogrammetric data so that it is small enough to render in a real-time environment. The optimized model, combined with mesh maps (texture maps, normal maps, etc.) looks like the original high detail model. The capture of a whole space makes it possible to create a VR experience with six degrees of freedom (6doF) that allows the user to explore the historic place. Creating these experiences can bring people to cultural heritage that is either endangered or too remote for some people to access. The workflow described in this paper will be demonstrated with the case study of Myin-pya-gu, an 11th century temple in Bagan, Myanmar.

关键词： virtual Reality Photogrammetry Physically Based Rendering Cultural Heritage Bagan

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3d CAMERAS ACQUISITIONS FOR THE dOCUMENTATION OF CULTURAL HERITAGE 8

3D CAMERAS ACQUISITIONS FOR THE DOCUMENTATION OF CULTURAL HE...

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

作者： Pulcrano, M. Scandurra, S. Minin, G. di Luggo, A. Univ Naples Federico II Dept Architecture DIARC Naples Italy Ingeo Srl Naples Italy

Photography has always been considered as a valid tool to acquire information about reality. Nowadays, its versatility, together with the development of new techniques and technologies, allows to use it in different fields of application. Particularly, in the digitization of built heritage, photography not only enables to understand and document historical and architectural artifacts but also to acquire morphological and geometrical data about them with automated digital photogrammetry. Nowadays, photogrammetry enables many tools to give virtual casts of reality by showing it in the way of point cloud. Although they can have metric reliability and visual quality, traditional instruments - such as monoscopic cameras - involve a careful planning of the campaign phase and a long acquisition and processing time. On the contrary, the most recent ones, based on the integration of different sensors and cameras, try to reduce the gap between time and results. The latter include some systems of indoor mapping who, thanks to 360 degrees acquisitions and SLAM technology, reconstruct the original scene in real time in great detail and with a photorealistic rendering. This study is aimed at reporting a research evaluating metric reliability and the level of survey detail with a Matterport Pro2 3d motorized rotating camera, equipped with SLAM technology, whose results have been compared with point clouds obtained by image-based and range-based processes.

关键词： spherical photogrammetry indoor mapping SLAM RGB-d data accuracy comparison

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