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检索条件"任意字段=Conference on 3D-Arch 2015 - 3D Virtual Reconstruction and Visualization of Complex Architectures"

共 154 条记录，以下是131-140 订阅

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3d RECORdING ANd MOdELLING OF MINING HERITAGE: THE MONSERRAT MINE, SIERRA MINERA OF CARTAGENA-LA UNION, SOUTHEAST OF SPAIN

3D RECORDING AND MODELLING OF MINING HERITAGE: THE MONSERRAT...

引用

conference on 3d virtual reconstruction and visualization of complex architectures

作者： Garcia-Leon, J. Garcia Martin, A. Torres Picazo, M. Fernandez, J. Tech Univ Cartagena Dept Architecture & Bldg Technol Cartagena Spain Tech Univ Cartagena Dept Min Geol & Cartog Engn Cartagena Spain

Mining heritage is essential to understand the history, landscape and cultural manifestations linked to mining industry. The Mountain Range of Cartagena-La Unin is one of the most relevant old Mediterranean mining areas, with mining sites that were already exploited before the Carthaginian domination. It was declared a Site of Cultural Interest in 2009. Our aim is to document and to enhance its premises, which are currently in a bad state of preservation and have been plundered. The methodology that we suggest combines various techniques, such as laser scanning, LIdAR and digital photogrammetry, in order to obtain the best results based on the characteristics of the objects to be inventoried. For this study, we have chosen an area in which a digital model has been created by means of terrestrial laser scanning and airborne LIdAR, then we have textured it with the images taken. With this model, it is possible to measure the deterioration and displacement suffered by its elements, in particular, the chimney and the boiler room.

关键词： Industrial Heritage documentation laser-scanning modelling mining premises risk of collapse

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THE INFLUENCE OF FLIGHT PLANNING ANd CAMERA ORIENTATION IN UAVs PHOTOGRAMMETRY. A TEST IN THE AREA OF ROCCA SAN SILVESTRO (LI), TUSCANY

THE INFLUENCE OF FLIGHT PLANNING AND CAMERA ORIENTATION IN U...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Chiabrando, F. Lingua, A. Maschio, P. Lose, L. Teppati Politecn Torino Dept Architecture & Design DAD 10125 Viale Pier Andrea Mattioli Turin Italy Politecn Torino Dept Environm Land & Infrastructure Engn DIATI 10129 Corso Duca Abruzzi Turin Italy

The purpose of this paper is to discuss how much the phases of flight planning and the setting of the camera orientation can affect a UAVs photogrammetric survey. The test site chosen for these evaluations was the Rocca of San Silvestro, a medieval monumental castle near Livorno, Tuscany (Italy). during the fieldwork, different sets of data have been acquired using different parameters for the camera orientation and for the set up of flight plans. Acquisition with both nadiral and oblique orientation of the camera have been performed, as well as flights with different direction of the flight lines (related with the shape of the object of the survey). The different datasets were then processed in several blocks using Pix4d software and the results of the processing were analysed and compared. Our aim was to evaluate how much the parameters described above can affect the generation of the final products of the survey, in particular the product chosen for this evaluation was the point cloud.

关键词： UAVs Photogrammetry Flight Planning Camera Orientation 3d documentation

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3d Surveying and modeling of underground passages in wwi fortifications 6

3D Surveying and modeling of underground passages in wwi for...

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6th International Workshop on 3d virtual reconstruction and visualization of complex architectures, 3d-arch 2015

作者： Rodríguez-Gonzálvez, P. Nocerino, E. Menna, F. Minto, S. Remondino, F. Department of Cartographic and Land Engineering High School of Ávila University of Salamanca Ávila Spain Trento Italy

ISBN: (纸本)9781629935201

The virtual reconstruction of subterranean structures is a suitable scenario for the integration of different geomatics techniques although narrow passages, lack of light and irregular surface can arise various problems in the data acquisition as well as processing procedures. Generally the final product is a dense and detailed 3d model, whose number of triangles increases quickly according to the complexity of the object. This complexity reduces the efficient use and dissemination of the produced information therefore innovative solutions are sought. The article presents the 3d surveying and modelling of underground passages of World War I (WWI) fortifications. After the acquisition of dense point clouds by means of terrestrial scanning (TLS), a simplification and optimization workflow is performed with the aim of generating a lightweight product that keeps the maximum amount of significant information. A continuous scene representation with a 87% triangle reduction is generated, while the final precision is preserved according to a tolerance predefined by the final user. Such 3d product can be employed as basis for reconstruction, consolidation, preservation and valorisation of the WWI tunnels.

关键词： data acquisition

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FISHEYE PHOTOGRAMMETRY: TESTS ANd METHOdOLOGIES FOR THE SURVEY OF NARROW SPACES

FISHEYE PHOTOGRAMMETRY: TESTS AND METHODOLOGIES FOR THE SURV...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Perfetti, Luca Polari, Carlo Fassi, Francesco Politecn Milan Grp 3DSurvey Architecture Built Environm & Construct Engn ABC Milan Italy

The research illustrated in this article aimed at identifying a good standard methodology to survey very narrow spaces during 3d investigation of Cultural Heritage. It is an important topic in today's era of BIM modelling applied to Cultural Heritage. Spaces like staircases, corridors and passages are very common in the architectural or archaeological fields, and obtaining a 3d-oriented survey of those areas can be a very complex task when completeness of the model and high precision are requested. Photogrammetry appears to be the most promising solution in terms of versatility and manoeuvrability also considering the quality of the required data. Fisheye lenses were studied and tested in depth because of their significant advantage in the field of view if compared with rectilinear lenses. This advantage alone can be crucial to reduce the total amount of photos and, as a consequence, to obtain manageable data, to simplify the survey phase and to significantly reduce the elaboration time. In order to overcome the main issue that arise when using fisheye lenses, which is the lack of rules that can be employed to design the survey, a general mathematical formulation to precisely estimate the GSd (Ground Sampling distance) for every optical projection is presented here. A complete survey of a real complex case study was performed in order to test and stress the proposed methodology, and to handle a fisheye-based survey from beginning to end: the photogrammetric survey of the Minguzzi Staircase. It is a complex service spiralstaircase located in the duomo di Milano with a total height of 25 meters and characterized by a narrow walkable space about 70 centimetres wide.

关键词： Fisheye Photogrammetry Survey Cultural heritage Narrow spaces lenses Projection

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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...

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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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3-dIMENSIONAL GEOMETRIC SURVEY ANd STRUCTURAL MOdELLING OF THE dOME OF PISA CATHEdRAL

3-DIMENSIONAL GEOMETRIC SURVEY AND STRUCTURAL MODELLING OF T...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Aita, d. Barsotti, R. Bennati, S. Caroti, G. Piemonte, A. Univ Pisa Dipartimento Ingn Civile & Ind Sez Strutture Largo Lucio Lazzarino 1 I-56122 Pisa Italy Univ Pisa Dipartimento Ingn Civile & Ind Sez Vie Trasporti & Geomat Largo Lucio Lazzarino 1 I-56122 Pisa Italy

This paper aims to illustrate the preliminary results of a research project on the dome of Pisa Cathedral (Italy). The final objective of the present research is to achieve a deep understanding of the structural behaviour of the dome, through a detailed knowledge of its geometry and constituent materials, and by taking into account historical and architectural aspects as well. A reliable survey of the dome is the essential starting point for any further investigation and adequate structural modelling. Examination of the status quo on the surveys of the Cathedral dome shows that a detailed survey suitable for structural analysis is in fact lacking. For this reason, high-density and high-precision surveys have been planned, by considering that a different survey output is needed, according both to the type of structural model chosen and purposes to be achieved. Thus, both range-based (laser scanning) and image-based (3d Photogrammetry) survey methodologies have been used. This contribution introduces the first results concerning the shape of the dome derived from surveys. Furthermore, a comparison is made between such survey outputs and those available in the literature.

关键词： Structural analysis Laser scanning Photogrammetry Cultural Heritage dome

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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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PHOTOGRAMMETRIC ANALYSIS OF HISTORICAL IMAGE REPOSITORIES FOR virtual reconstruction IN THE FIELd OF dIGITAL HUMANITIES

PHOTOGRAMMETRIC ANALYSIS OF HISTORICAL IMAGE REPOSITORIES FO...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Maiwald, F. Vietze, T. Schneider, d. Henze, F. Muenster, S. Niebling, F. Tech Univ Dresden Inst Photogrammetry & Remote Sensing Dresden Germany Brandenburg Tech Univ Cottbus Informat Verarbeitung Bauwesen Vermessungskunde Cottbus Germany Tech Univ Dresden Media Ctr Dresden Germany Julius Maximilians Univ Wurzburg Human Comp Interact Wurzburg Germany

Historical photographs contain high density of information and are of great importance as sources in humanities research. In addition to the semantic indexing of historical images based on metadata, it is also possible to reconstruct geometric information about the depicted objects or the camera position at the time of the recording by employing photogrammetric methods. The approach presented here is intended to investigate (semi-) automated photogrammetric reconstruction methods for heterogeneous collections of historical (city) photographs and photographic documentation for the use in the humanities, urban research and history sciences. From a photogrammetric point of view, these images are mostly digitized photographs. For a photogrammetric evaluation, therefore, the characteristics of scanned analog images with mostly unknown camera geometry, missing or minimal object information and low radiometric and geometric resolution have to be considered. In addition, these photographs have not been created specifically for documentation purposes and so the focus of these images is often not on the object to be evaluated. The image repositories must therefore be subjected to a preprocessing analysis of their photogrammetric usability. Investigations are carried out on the basis of a repository containing historical images of the Kronentor ('crown gate') of the dresden Zwinger. The initial step was to assess the quality and condition of available images determining their appropriateness for generating three-dimensional point clouds from historical photos using a structure-from-motion evaluation (SfM). Then, the generated point clouds were assessed by comparing them with current measurement data of the same object.

关键词： Historical images structure-from-motion image configuration point cloud virtual 3d reconstruction

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EXTENdING THE LIFE OF virtual HERITAGE: REUSE OF TLS POINT CLOUdS IN SYNTHETIC STEREOSCOPIC SPHERICAL IMAGES

EXTENDING THE LIFE OF VIRTUAL HERITAGE: REUSE OF TLS POINT C...

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conference on 3d virtual reconstruction and visualization of complex architectures

作者： Fernandez, J. Garcia Tammi, K. Joutsiniemi, A. Tampere Univ Technol Sch Architecture Rakennustalo Bldg Tampere 33720 Finland Tampere Univ Appl Sci Sch Construct & Environm Engn TAMK Kuntokatu 3 Tampere 33520 Finland

Recent advances in Terrestrial Laser Scanner (TLS), in terms of cost and flexibility, have consolidated this technology as an essential tool for the documentation and digitalization of Cultural Heritage. However, once the TLS data is used, it basically remains stored and left to waste. How can highly accurate and dense point clouds (of the built heritage) be processed for its reuse, especially to engage a broader audience? This paper aims to answer this question by a channel that minimizes the need for expert knowledge, while enhancing the interactivity with the as-built digital data: virtual Heritage dissemination through the production of VR content. driven by the ProdigiOUs project's guidelines on data dissemination (EU funded), this paper advances in a production path to transform the point cloud into virtual stereoscopic spherical images, taking into account the different visual features that produce depth perception, and especially those prompting visual fatigue while experiencing the VR content. Finally, we present the results of the Hiedanranta's scans transformed into stereoscopic spherical animations.

关键词： Point Cloud Terrestrial Laser Scanner Reuse VR Stereoscopic Spherical Images

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Photo-realistic terrain modeling and visualization for Mars Exploration Rover Science Operations

Photo-realistic terrain modeling and visualization for Mars ...

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IEEE International conference on Systems, Man and Cybernetics

作者： Edwards, L Sims, M Kunz, C Lees, d Bowman, J NASA Ames Res Ctr Moffett Field CA 94035 USA

ISBN: (纸本)0780392981

Modern NASA planetary exploration missions employ complex systems of hardware and software managed by large teams of engineers and scientists in order to study remote environments. The most complex and successful of these recent projects is the Mars Exploration Rover mission. The Computational Sciences division at NASA Ames Research Center delivered a 3d visualization program, Viz, to the AHR mission that provides an immersive, interactive environment for science analysis of the remote planetary surface. In addition, Ames provided the Athena Science Team with high-quality terrain reconstructions generated with the Ames Stereo-pipeline. The on-site support team for these software systems responded to unanticipated opportunities to generate 3d terrain models during the primary AHR mission. This paper describes Viz, the Stereo-pipeline, and the experiences of the on-site team supporting the scientists at JPL during the primary AHR mission.

关键词： visualization virtual reality software architectures simulation stereo correlation computer vision surface reconstruction

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