检索结果-内蒙古大学图书馆

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

作者： Alsadik, Bashar Remondino, Fabio Menna, Fabio Gerke, Markus Vosselman, George Univ Twente ITC Fac EOS Dept NL-7500 AE Enschede Netherlands Bruno Kessler Fdn FBK Opt Metrol Unit 3D Trento Italy Univ Baghdad Coll Engn Surveying Dept Baghdad Iraq

ISBN: (纸本)9781629935201

Image-based modeling techniques are an important tool for producing 3d models in a practical and cost effective manner. Accurate image-based models can be created as long as one can retrieve precise image calibration and orientation information which is nowadays performed automatically in computer vision and photogrammetry. The first step for orientation is to have sufficient correspondences across the captured images. Keypoint descriptors like SIFT or SURF are a successful approach for finding these correspondences. The extraction of precise image correspondences is crucial for the subsequent image orientation and image matching steps. Indeed there are still many challenges especially with wide-baseline image configuration. After the extraction of a sufficient and reliable set of image correspondences, a bundle adjustment is used to retrieve the image orientation parameters. In this paper, a brief description of our previous work on automatic camera network design is initially reported. This semi-automatic procedure results in wide-baseline high resolution images covering an object of interest, and including approximations of image orientations, a rough 3d object geometry and a matching matrix indicating for each image its matching mates. The main part of this paper will describe the subsequent image matching where the pre-knowledge on the image orientations and the pre-created rough 3d model of the study object is exploited. Ultimately the matching information retrieved during that step will be used for a precise bundle block adjustment. Since we defined the initial image orientation in the design of the network, we can compute the matching matrix prior to image matching of high resolution images. For each image involved in several pairs that is defined in the matching matrix, we detect the corners or keypoints and then transform them into the matching images by using the designed orientation and initial 3d model. Moreover, a window is defined for each corner and

关键词： IBM Bundle adjustment SIFT 3d image spanning tree

来源：评论

学校读者我要写书评

暂无评论

3d MOdELING OF GIRIFALCO FORTRESS 8

3D MODELING OF GIRIFALCO FORTRESS

引用

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

作者： Masiero, A. Chiabrando, F. Lingua, A. M. Marino, B. G. Fissore, F. Guarnieri, A. Vettore, A. Univ Padua Interdept Res Ctr Geomat CIRGEO Viale Univ 16 I-35020 Legnaro PD Italy Politecn Torino Dept Architecture & Design Viale Mattioli 39 I-10125 Turin Italy Politecn Torino Dept Environm Land & Infrastructure Engn Cso Duca Abruzzi 24 I-10129 Turin Italy Univ Federico II DiARC Dept Architecture Naples Italy

despite photogrammetry has been longly used for 3d model production, the recent development of structure from motion based reconstructions and the spread of unmanned aerial vehicles (UAV) are increasing its usage even further. Actually, the combined use of nadir and oblique UAV photogrammetry allows to cross the bridge between close range and aerial photogrammetry, enabling the quick acquisition of images for detailed 3d model production. This paper assesses the accuracy of UAV photogrammetry in the reconstruction of a cultural heritage building, namely the Girifalco fortress (Cortona, Italy), and it evaluates advantages and issues of this kind of 3d model generation. Furthermore, this work aims also at investigating the possible use of the generated model in order to extract geometric information about the building. First, elementary geometric shapes are extracted from the photogrammetric point cloud: the results of this step can be exploited for enabling the automatic generation of compact models of the building, which can be useful for instance in 3d city modeling applications. Then, a proper analysis of the geometric information included in the extracted shapes can be used in order to extract semantic information (e.g. to classify windows and doors) and to detect damaged areas on the building walls.

关键词： Photogrammetry UAV Laser Scanning Cultural Heritage Buildings Point cloud segmentation

来源：评论

学校读者我要写书评

暂无评论

REPRESENTATION OF SYNTHETIC SHAdOWS ON 3d dIGITAL MOdELS FOR THE VOLUMETRIC INTERPRETATION ON CONCAVE-CONVEX ARCHAEOLOGICAL ARTIFACTS 8

REPRESENTATION OF SYNTHETIC SHADOWS ON 3D DIGITAL MODELS FOR...

引用

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

作者： Garcia-Fernandez, J. Medeiros, L. Pernao, J. Univ Lisbon Fac Arquitetura Lisbon Portugal Univ Nova Lisboa Fac Ciencias Sociais & Humanas Lisbon Portugal

The representation of archaeological artefacts aims for the graphic description of relevant information from the object, to allow for the proper interpretation of evidences from the past. Concavities and convexities are elements often difficult to represent through classical (analogical) representation techniques, especially when these geometrical characteristics are neither continue nor parameterizable. digital techniques have advanced on the accurate reconstruction of 3d shapes, while attaching real colour to the geometry. However, the perception of concave/convex shapes from photorealistic true-orthoimages continues to be limited, especially when rich and homogeneous textures camouflage slight slope changes or volumetric deformations. In this paper we first critically review the current practice on the representation of solid-of-revolution artefacts with concave-convex predominance, and alternative photorealistic representations aiming at a better understanding of volume and colour. Given the limitation targeted, we then propose a workflow for the creation of true-orthometric maps enhanced by customized shadows. The work-flow integrates considerations on: (i) The orientation of archaeological artefact;(ii) the creation of accurate orthometric images based on digital photogrammetry techniques;and (iii) the application of synthetic attached and cast shadows according the shape (information) to be represented. The workflow is demonstrated with a sample of plates retrieved from the Rua-das-Madres archaeological site, in Portugal.

关键词： Representation Interpretation Archaeology Shadows 3d modelling

来源：评论

学校读者我要写书评

暂无评论

A Large-scale Scene display System Based on WebGL 8

A Large-scale Scene Display System Based on WebGL

引用

8th International conference on virtual Reality and visualization (ICVRV)

作者： Jiang, Wencong Li, Yao Qi, Yue Beihang Univ State Key Lab Virtual Real Technol & Syst Unit PLA 91439 Beijing Peoples R China Beihang Univ State Key Lab Virtual Real Technol & Syst Qingdao Res Inst Beijing Peoples R China

ISBN: (纸本)9781538684979

In recent decades, computer vision has been a hot area of computer research while 3d reconstruction is one of the hot topics. With the improvement of 3d reconstruction theory and the rapid development of computer hardware technology, the reconstructed 3d models are enlarging in scale and increasing in complexity. Combining the aerial image of UAV with the 3d reconstruction of sequence images, it is of great value to carry out relevant research on the problem of 3d reconstruction of outdoor scenes. The fast rendering of these large-scale scene models is a challenge. At the same time, with the advancement of the HMTL5 specification, browsers have become more and more powerful, and WebGL has gradually gained support from more and more devices. The 3d rendering of the BS architecture will be the future direction of the rendering engine. The browser does not need to install the client program, which is convenient for users to access and process in any environment. Therefore, the large-scale scene display system based on web architecture is more convenient. In this paper, we designed a real-time display system for large-scale scenes, and studied WebGL based rendering frame techniques.

关键词： 3d reconstruction Large-scale scene Rendering System LOd WebGL

来源：评论

学校读者我要写书评

暂无评论

reconstruction and visualization of 3d models of colonic surface

引用

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

来源：评论

学校读者我要写书评

暂无评论

Sv3dvision: 3d reconstruction and visualization from a single view

Sv3dvision: 3d reconstruction and visualization from a singl...

引用

2005 virtual reconstruction and visualization of complex architectures, 3d-ARCH 2005

作者： Aguilera, d.G. Gómez Lahoz, J. Finat Codes, J. High Polytechnic School Ávila Univ. of Salamanca Spain MoBiVA Group Univ. of Valladolid Lab.2.2 Building I+D Spain

Nowadays, there is a huge proliferation of software based on traditional image-based 3d reconstruction methods which use multiple images to extract 3d models. However, sometimes it is not possible to obtain such images, mainly when damaged or destroyed buildings need to be documented and only single photographs or paintings exist or even when working with multiple images, parts of the scene appear in only one image due to occlusions or lack of features to match between images. This paper presents the sv3dVision software, a tool developed for the 3d reconstruction and visualization from a single view which integrates approaches of Photogrammetry, Computer Vision and Computer Graphics. © 2005 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： visualization

来源：评论

学校读者我要写书评

暂无评论

SCAN-TO-BIM vs 3d IdEAL MOdEL HBIM: PARAMETRIC TOOLS TO STUdY dOMES GEOMETRY 8

SCAN-TO-BIM vs 3D IDEAL MODEL HBIM: PARAMETRIC TOOLS TO STUD...

引用

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

作者： Capone, M. Lanzara, E. Univ Naples Federico II UNINA Naples Italy

The contribution is part of an interdisciplinary research that aims to address the problems of knowledge, interpretation and documentation of vulnerable structures such as the brick Renaissance domes in Campania (XV-XVI century). The goal is to analyze the relationship between Survey, Historic Building Information Modelling (HBIM) and 3d parametric models based on geometric rules from Treaties to study and to manage Cultural Heritage. HBIM is generally based on scan-to-BIM process that allows to generate 3d model from point cloud. The reverse modeling process, from a point cloud to parametric geometric model, poses a series of issues at the center of cultural debate that currently takes place around HBIM. The experimentation underway is part of this research field with the aim of using the parametric approach as a tool able to introduce an additional methodology for big data interpretation. Currently we can identify two different approaches for the construction of a HBIM system: building a simplified model by identifying the shape grammar or building the geometric components from survey without using pre-compiled objects libraries, following the scan to BIM logic. In our research we are going to identify an "hybrid" methodology. Generally the process is based on the knowledge and critical abilities of individual scholars, the idea is to increase the efficiency of the system through collaborative workflow forms that allow to optimize the processes through effective knowledge management actions. We are going to use procedural modeling techniques to generate HBIM domes library.

关键词： Procedural Modeling HBIM domes Parametric tools

来源：评论

学校读者我要写书评

暂无评论

The immersive time-machine: A virtual exploration of the history of Livorno 3

The immersive time-machine: A virtual exploration of the his...

引用

3rd ISPRS International Workshop on 3d virtual reconstruction and visualization of complex architectures, 3d-ARCH 2009

作者： Carrozzino, M. Evangelista, C. Bergamasco, M. PERCRO Scuola Superiore Sant'Anna Pisa Italy IMT Institute of Advanced Studies Lucca Italy

In this paper we present the results of a multimedia project dealing with the virtual reconstruction and the immersive visualization of the urban development of the town of Livorno, in the Italian region of Tuscany, on the 400th anniversary of its promotion to the rank of City. The project involved the realization of a 3d model of the town in ages, aiming to show its evolution and development in time. The results have been demonstrated in the context of a dedicated exhibition, making use of an immersive stereoscopic installation conceived for large audiences, hosted in the premises of Museo Fattori in Livorno.

关键词： Stereo image processing

来源：评论

学校读者我要写书评

暂无评论

3d RECORdING FOR 2d dELIVERING - THE EMPLOYMENT OF 3d MOdELS FOR STUdIES ANd ANALYSES 4

3D RECORDING FOR 2D DELIVERING - THE EMPLOYMENT OF 3D MODELS...

引用

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

作者： Rizzi, A. Baratti, G. Jimenez, B. Girardi, S. Remondino, F. Bruno Kessler Fdn FBK Opt Metrol Unit 3D Trento Italy Univ Milan I-20122 Milan Italy

In the last years, thanks to the advances of surveying sensors and techniques, many heritage sites could be accurately replicated in digital form with very detailed and impressive results. The actual limits are mainly related to hardware capabilities, computation time and low performance of personal computer. Often, the produced models are not visible on a normal computer and the only solution to easily visualized them is offline using rendered videos. This kind of 3d representations is useful for digital conservation, divulgation purposes or virtual tourism where people can visit places otherwise closed for preservation or security reasons. But many more potentialities and possible applications are available using a 3d model. The problem is the ability to handle 3d data as without adequate knowledge this information is reduced to standard 2d data. This article presents some surveying and 3d modeling experiences within the APSAT project ("Ambiente e Paesaggi dei Siti d'Altura Trentini", i.e. Environment and Landscapes of Upland Sites in Trentino). APSAT is a multidisciplinary project funded by the Autonomous Province of Trento (Italy) with the aim documenting, surveying, studying, analysing and preserving mountainous and hill-top heritage sites located in the region. The project focuses on theoretical, methodological and technological aspects of the archaeological investigation of mountain landscape, considered as the product of sequences of settlements, parcelling-outs, communication networks, resources, and symbolic places. The mountain environment preserves better than others the traces of hunting and gathering, breeding, agricultural, metallurgical, symbolic activities characterised by different lengths and environmental impacts, from Prehistory to the Modern Period. Therefore the correct surveying and documentation of this heritage sites and material is very important. Within the project, the 3dOM unit of FBK is delivering all the surveying and 3d material to t

关键词： Cultural Heritage Laser scanning Photogrammetry 3d modeling

来源：评论

学校读者我要写书评

暂无评论

ACCURACY EVALUATION OF A MOBILE MAPPING SYSTEM WITH AdVANCEd STATISTICAL METHOdS 6

ACCURACY EVALUATION OF A MOBILE MAPPING SYSTEM WITH ADVANCED...

引用

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

作者： Toschi, I. Rodriguez-Gonzalvez, P. Remondino, F. Minto, S. Orlandini, S. Fuller, A. Bruno Kessler Fdn FBK Opt Metrol Unit 3D 3DOM Trento Italy Univ Salamanca High Sch Avila Dept Cartog & Land Engn Avila Spain Microgeo Florence Italy RIEGL Vienna Austria

ISBN: (纸本)9781629935201

This paper discusses a methodology to evaluate the precision and the accuracy of a commercial Mobile Mapping System (MMS) with advanced statistical methods. So far, the metric potentialities of this emerging mapping technology have been studied in few papers, where generally the assumption that errors follow a normal distribution is made. In fact, this hypothesis should be carefully verified in advance, in order to test how well the Gaussian classic statistics can adapt to datasets that are usually affected by asymmetrical gross errors. The workflow adopted in this study relies on a Gaussian assessment, followed by an outlier filtering process. Finally, non-parametric statistical models are applied, in order to achieve a robust estimation of the error dispersion. Among the different MMSs available on the market, the latest solution provided by RIEGL is here tested, i.e. the VMX-450 Mobile Laser Scanning System. The test-area is the historic city centre of Trento (Italy), selected in order to assess the system performance in dealing with a challenging and historic urban scenario. Reference measures are derived from photogrammetric and Terrestrial Laser Scanning (TLS) surveys. All datasets show a large lack of symmetry that leads to the conclusion that the standard normal parameters are not adequate to assess this type of data. The use of non-normal statistics gives thus a more appropriate description of the data and yields results that meet the quoted a-priori errors.

关键词： Mobile Accuracy Precision Statistic Terrestrial Photogrammetry Laser scanning

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：