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Proceedings. Computer Graphics International (Cat. No.98EX149)最新文献

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Integration techniques for 3D surface reconstruction 三维曲面重建的集成技术
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694314
H. Thiele, R. Klette
{"title":"Integration techniques for 3D surface reconstruction","authors":"H. Thiele, R. Klette","doi":"10.1109/CGI.1998.694314","DOIUrl":"https://doi.org/10.1109/CGI.1998.694314","url":null,"abstract":"This paper describes on-going research about integration techniques for 3D surface reconstruction. Our goal is to establish simple and robust 3D models for the growing needs of visual communication. Introducing and analyzing some typical techniques, we propose a new method for generating complete 3D models of complex objects-combining \"shape from occluding contours\" and photometric stereo techniques.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127310605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Hierarchical decomposition of datasets on irregular surface meshes 不规则曲面网格上数据集的分层分解
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694250
Georges-Pierre Bonneau, A. Gerussi
{"title":"Hierarchical decomposition of datasets on irregular surface meshes","authors":"Georges-Pierre Bonneau, A. Gerussi","doi":"10.1109/CGI.1998.694250","DOIUrl":"https://doi.org/10.1109/CGI.1998.694250","url":null,"abstract":"We introduce multiresolution analysis (MRA) algorithms intended to be used in scientific visualization, and based on a non-nested set of approximating spaces. The need for non-nested spaces arises from the fact that the required scaling functions do not fulfil any refinement equation. Therefore we introduce in the first part the concept of the approximated refinement equation, that allows to generalize the filter bank and exact reconstruction algorithms. The second part shows how this concept enables to define an MRA scheme for piecewise constant data defined on an arbitrary planar or spherical triangular mesh. The ability to deal with arbitrary triangular meshes, without subdivision connectivity, can be achieved only through the use of non-nested approximating spaces, as introduced in the first part.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127422717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
3D visualization and evaluation of remote sensing data 遥感数据的三维可视化与评价
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694299
P. Schulze, S. Growe, R. Tönjes
{"title":"3D visualization and evaluation of remote sensing data","authors":"P. Schulze, S. Growe, R. Tönjes","doi":"10.1109/CGI.1998.694299","DOIUrl":"https://doi.org/10.1109/CGI.1998.694299","url":null,"abstract":"The parallel evaluation of remote sensing data from multiple sensors is complicated by different image scales and orientations. Thus, simultaneous visualization of the multi-sensor data is envisaged. For a spatial impression of the observed area the images are co-registered, projected onto a 3D terrain model and displayed stereoscopically. The presented 3D evaluation system allows real-time navigation in the virtual landscape. The user is able to manipulate the 3D model by blending the images ad forming a mosaic from different sensors. Online access to a geoinformation system (GIS) offers the possibility to display GIS data.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129410169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Virtual Worlds-a virtual environment architecture 虚拟世界——一种虚拟环境架构
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694280
M. Fradinho, J. Pereira
{"title":"Virtual Worlds-a virtual environment architecture","authors":"M. Fradinho, J. Pereira","doi":"10.1109/CGI.1998.694280","DOIUrl":"https://doi.org/10.1109/CGI.1998.694280","url":null,"abstract":"The authors present Virtual Worlds as an open architecture for large-scale virtual environments with multi-users. It is based on the integration of VRML, Java and the Internet bringing forth a cross-platform solution. Virtual Worlds is furnished with a set of tools and APIs that allow one to create, extend and customise one's own virtual environment.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129615429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The analysis and reconstruction of repetitive textures 重复纹理的分析与重建
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694278
C. Handley
{"title":"The analysis and reconstruction of repetitive textures","authors":"C. Handley","doi":"10.1109/CGI.1998.694278","DOIUrl":"https://doi.org/10.1109/CGI.1998.694278","url":null,"abstract":"Many interesting textures, whether natural, such as reptile skin, or synthetic, such as knitting, are made up of repeating elements. For these textures it can be shown that a suitably painted parallelogram tile can recreate the original image. This tile can be characterised by the vectors that define adjacent sides. Several methods have been proposed to extract these vectors. The paper examines and extends these and introduces new ones. These methods have been applied to a wide variety of images, and interesting and novel ways of modifying the synthesis process to introduce local deformations are explored.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124226030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Uncertainty coding and controlled data reduction using fuzzy-B-splines 不确定性编码与模糊b样条控制数据约简
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694307
G. Gallo, M. Spagnuolo
{"title":"Uncertainty coding and controlled data reduction using fuzzy-B-splines","authors":"G. Gallo, M. Spagnuolo","doi":"10.1109/CGI.1998.694307","DOIUrl":"https://doi.org/10.1109/CGI.1998.694307","url":null,"abstract":"In this paper, a method is described for the representation and reconstruction of single-valued surfaces given as sets of measured data, which may be uncertain as well as crisp. In the case of imprecise data, the fuzzy B-spline representation is able to keep track of uncertainty and provide tools for interrogating the model at prescribed presumption levels. In both cases, a very high degree of compression can be achieved through a procedure which defines, among spatially-clustered points, the most significant representative of the local neighbourhood. Experimental results are shown to prove the effectiveness of the proposed approach.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128147345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Implicit surface reconstruction from 2D CT scan sections 二维CT扫描切片的隐式表面重建
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694316
Serge Pontier, B. Shariat, D. Vandorpe
{"title":"Implicit surface reconstruction from 2D CT scan sections","authors":"Serge Pontier, B. Shariat, D. Vandorpe","doi":"10.1109/CGI.1998.694316","DOIUrl":"https://doi.org/10.1109/CGI.1998.694316","url":null,"abstract":"In this paper a new method, using the skeleton-based implicit model, is introduced for shape reconstruction of objects from a set of data points organized in planar sections. To reduce complexity and computation time, the objects are described by a uniform field function and a \"3D weighted skeleton\". The 3D skeleton is composed of planar elements and is deduced from the 2D Voronoi skeleton of each section. The weights are distances creating a non uniform offset of the skeleton.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127930755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Illumination analysis for synthetic/natural hybrid image sequence generation 合成/自然混合图像序列生成的光照分析
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694303
J. Stauder
{"title":"Illumination analysis for synthetic/natural hybrid image sequence generation","authors":"J. Stauder","doi":"10.1109/CGI.1998.694303","DOIUrl":"https://doi.org/10.1109/CGI.1998.694303","url":null,"abstract":"For virtual studio TV production, multi-site videoconference applications using a virtual meeting room and for synthetic/natural hybrid coding according to the forthcoming ISO/MPEG-4 standard, a synthetic and a natural scene are mixed to generate a synthetic/natural hybrid image sequence. For realism, the illumination in both scenes should be identical. The illumination of the natural scene is estimated automatically and applied to the synthetic scene. For illumination estimation, moving real objects are segmented in the natural image sequence and 3D modeled. The 3D shape, 3D motion and the displaced frame difference between two succeeding images are evaluated to estimate three illumination parameters. The parameters describe a distant point light source and ambient light. Using the estimated illumination parameters, the synthetic scene is rendered and mixed to the natural image sequence. Experimental results with a moving virtual ball mixed automatically into a real video telephone sequence show that virtual objects appear naturally having the same shading and shadows as the real person.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117336321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Semi-automatic modelling of urban buildings from high resolution aerial imagery 基于高分辨率航空图像的城市建筑半自动建模
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694317
D. Frère, J. Vandekerckhove, T. Moons, L. Gool
{"title":"Semi-automatic modelling of urban buildings from high resolution aerial imagery","authors":"D. Frère, J. Vandekerckhove, T. Moons, L. Gool","doi":"10.1109/CGI.1998.694317","DOIUrl":"https://doi.org/10.1109/CGI.1998.694317","url":null,"abstract":"A method is presented to (semi-)automatically generate 3D models of urban buildings from aerial images. The process starts by selecting (with a mouse click) one or more roofs in the image(s). The program then automatically delineates the roof structures in the images and extracts straight line segments which are matched across different views and reconstructed in 3D. These 3D line segments are then grouped into coplanar sets and combined into polygonal shapes. Each polygon hypothesis is verified with respect to the 3D reconstruction and the original image data; and, if necessary, corrected accordingly. Subsequently, the polygons are combined into a polyhedral roof model. The emphasis here is on extracting the correct topology of the roof structure. Metric accuracy is obtained by back-projecting the model into the images and minimizing the total reprojection error. Finally, the building model is completed by adding vertical walls to the reconstructed roof. The approach is tested on a state-of-the-art dataset of aerial images of residential areas in Brussels.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129562150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Ridges and ravines on implicit surfaces 隐式表面上的山脊和沟壑
Proceedings. Computer Graphics International (Cat. No.98EX149) Pub Date : 1998-06-22 DOI: 10.1109/CGI.1998.694306
A. Belyaev, A. Pasko, T. Kunii
{"title":"Ridges and ravines on implicit surfaces","authors":"A. Belyaev, A. Pasko, T. Kunii","doi":"10.1109/CGI.1998.694306","DOIUrl":"https://doi.org/10.1109/CGI.1998.694306","url":null,"abstract":"Surface creases provide us with important information about the shapes of objects and can be intuitively defined as curves on a surface along which the surface bends sharply. Our mathematical description of such surface creases is based on a study of extrema of the principal curvatures along their curvature lines. On a smooth generic surface we define ridges to be the local positive maxima of the maximal principal curvature along its associated curvature line and ravines to be the local negative minima of the minimal principal curvature along its associated curvature line. The ridges and ravines are important for shape analysis and possess remarkable mathematical properties. For example, they correspond to the end points of shape skeletons. In this paper we derive formulas to detect the ridges and ravines on a surface given in implicit form. We also propose an algorithm for obtaining piecewise linear approximation of ridges and ravines as intersection curves of two implicit surfaces.","PeriodicalId":434370,"journal":{"name":"Proceedings. Computer Graphics International (Cat. No.98EX149)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127365620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 55
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