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检索条件"任意字段=International Symposium on 3D Data Processing Visualization and Transmission"

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Edge-constrained marching triangles

Edge-constrained marching triangles

引用

international symposium on 3d data processing visualization and transmission

作者： N.H. McCormick R.B. Fisher Division of Informatics University of Edinburgh UK

Marching triangles is a method for producing a polygon mesh surface approximation composed of triangular facets which are approximately equilateral. This paper improves the marching triangles algorithm where the inputs are multiple range images of scenes. C/sup 1/ discontinuities (fold edges) are detected and used to constrain the final triangulation, thus increasing the accuracy of the mesh at sharp edges and corners and decreasing the number of triangles with a poor aspect ratio.

关键词： Image edge detection Informatics Face detection Layout Rendering (computer graphics) Computer graphics Terrain mapping Spatial resolution Sampling methods data processing

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3d volume extraction and mesh generation using energy minimization techniques

3D volume extraction and mesh generation using energy minimi...

引用

international symposium on 3d data processing visualization and transmission

作者： A. doi S. Fujiwara K. Matsuda M. Kameda Faculty of Software and Information Science Iwate Prefectural University Japan

In order to automatically extract an arbitrary 3d region from 3d image data (volume data), we have developed a physics-based approach using a 3d deformable grid model, which we called "3d Active Grid". 3d Active Grid is an extension of 3d deformable surface models, such as "balloon", and "3d Active Net". Unlike 3d deformable surface models, the proposed method enables stable extraction of a 3d region by using both boundary and interior information. Moreover, since the generated geometry data can be input directly into the FEM (finite element method), the 3d Active Grid has many potential applications including virtual simulation of surgery, shape modeling, computer vision, and so on.

关键词： Mesh generation data mining deformable models Solid modeling Computational geometry Finite element methods Application software Computational modeling Computer simulation Surgery

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IBR-based compression for remote visualization

IBR-based compression for remote visualization

引用

international symposium on 3d data processing visualization and transmission

作者： R. Bernardini G.M. Cortelazzo G. Tormen Dipartimento Elettronica ed Informatica Università di Padova Padova Italy

The standard way of remotely visualizing virtual worlds is downloading the virtual world to the user's computer, then rendering it. This approach is plagued by many problems which can be overcome by moving the rendering at server's side and by essentially turning interactive visualization into an image transmission problem. How to effectively compress the rendered views which need to be transmitted to the client is a fundamental issue within this remote visualization scenario. This work presents an original compression scheme for remote visualization based on image based rendering. A remote visualization system incorporating this compression method was implemented and its experimental performance is discussed.

关键词： Image coding Rendering (computer graphics) Transform coding Image communication Navigation Size control Network servers data visualization Turning Internet

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A gesture recognition system using 3d data

A gesture recognition system using 3D data

引用

international symposium on 3d data processing visualization and transmission

作者： S. Malassiotis N. Aifanti M.G. Strintzis Informatics and Telematics Institute Thessaloniki Greece

In this paper a gesture recognition system using 3d data is described The system relies on a novel 3d sensor that generates a dense range image of the scene. The main novelty of the proposed system, with respect to other 3d gesture recognition techniques, is the capability for robust recognition of complex hand postures such as those encountered in sign language alphabets. This is achieved by explicitly employing 3d hand features. Moreover the proposed approach does not rely on colour information, and guarantees robust segmentation of the hand under various illumination conditions, and content of the scene. Several novel 3d image analysis algorithms are presented covering the complete processing chain: 3d image acquisition, arm segmentation, hand-forearm segmentation, hand pose estimation, 3d feature extraction, and gesture classification. The proposed system is tested in an application scenario involving the recognition of sign-language postures.

关键词： Image segmentation Layout Robustness Image recognition Image sensors Sensor phenomena and characterization Sensor systems Handicapped aids Lighting Image color analysis

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Modeling shapes and textures from images: new frontiers

Modeling shapes and textures from images: new frontiers

引用

international symposium on 3d data processing visualization and transmission

作者： L. Van Gool d. Vandermeulen G. Kalberer T. Tuytelaars A. Zalesny ESAT/PSI/Visics Katholieke Universiteit Leuven Belgium D-ITET/BIWI ETH Zurich Switzerland ESAT/PSI/MIC Katholieke Universiteit Leuven Belgium

Increasingly, models of the world are directly built from images. The paper discusses a number of recent developments that try to push the envelope of what image-based modeling can achieve. In particular the analysis of 3d surface deformations is discussed for face animation, the extraction of matches under wide baseline conditions for 3d scene reconstruction, and the synthesis of viewpoint dependent textures for realistic object rendering.

关键词： Shape Facial animation Surface texture Speech synthesis Anatomy Image reconstruction deformable models data mining Speech analysis Mouth

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How can we exploit typical architectural structures to improve model recovery?

How can we exploit typical architectural structures to impro...

引用

international symposium on 3d data processing visualization and transmission

作者： P. Faber B. Fisher Division of Informatics University of Edinburgh Edinburgh UK

In this work we address the question of how to exploit typical architectural structures to improve recovery for CAd modeling of built environments from 3d data. In doing so we have examined the applicability of the GENOCOP III algorithm to the model fitting. The algorithm uses explicit domain knowledge, specifically geometric constraints in the form of parameterized surface models and a Euclidean fitting of geometric primitives that describe the parameterized surface models. Beside some results fitting parameterized surface models to real 3d datasets, example times for convergence and comparison with known ground truth are given.

关键词： Surface fitting Solid modeling Shape Convergence Buildings Feature extraction data mining Evolutionary computation Image segmentation Informatics

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Optical 3d-Sensing and CAd/CAM for medicine and art conservation

Optical 3D-Sensing and CAD/CAM for medicine and art conserva...

引用

7th international symposium on Laser Metrology Applied to Science, Industry and Everyday Life

作者： Häusler, G Benz, M Ettl, P Karbacher, S Laboureux, X Lampalzer, R Veit, K Nkenke, E Univ Erlangen Nurnberg Chair Opt D-91058 Erlangen Germany

ISBN: (纸本)0819446866

The combination of optical 3d-sensing, CAd/CAM and reverse engineering offers new opportunities for medical diagnosis and therapy, as well as for art conservation. We report our activities on the fields of dental CAd/CAM, face surgery, restoration, and others. We will discuss essential problems and solutions, specifically addressing the physical and technological limits for these applications. One example is that speckle noise limits the dynamical range of optical sensors to about 5000:1, but a good visualization needs a dynamical range of 100000:1. A technical (and commercial) limitation of rapid prototyping is the high cost that prevents mass production. As a consequence, for those "real" applications mentioned above, we do not need only optical 3d-sensors that work at the limits given by physics, we need as well perfect surface reconstruction techniques to automatically smooth the sensor data, without destruction of edges. We have to register many views, automatically, and to visualize the data. The processing chain is only complete with effective technology for rapid prototyping, such as fused deposition modeling or laser sintering.

关键词： Optical Metrology three-dimensional sensing mesh reconstruction CAd/CAM reverse engineering rapid prototyping dental CAd/CAM

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3d effect generation from monocular view

3D effect generation from monocular view

引用

international symposium on 3d data processing visualization and transmission

作者： S. Curti d. Sirtori F. Vella STMicroelectronics AST Catania Laboratory Italy

describes the technique used to generate stereo pair images starting from a single image source (single view-point) and its related depth map. The conjunction between source image and depth map allows reconstruction artificially of the binocular view producing a 3d effect depending on screen dimension and image resolution. The system does not reconstruct the real 3d-coordinates of any object inside the scene, but simply assigns the most comfortable shift to the source points to give a 3d-entertainment to the viewer. A simple smoothing filtering technique adaptively resolves the occlusions generated by shifting of the source points without introducing visible and/or annoying artifacts.

关键词： Image reconstruction Cameras Layout Image converters Microelectronics Image resolution Three dimensional displays Image generation Smoothing methods Adaptive filters

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Comparison of 3d measurement techniques in cultural heritage application: user point of view

Comparison of 3D measurement techniques in cultural heritage...

引用

international symposium on 3d data processing visualization and transmission

作者： F. Pozzi University of Udine Udine Italy

This paper summarizes the results from a Phd thesis concerned with the comparison between traditional and new three-dimensional (3d) surveying techniques from a user point of view. Three types of 3d surveying methods were tested. The three methods are manual survey combined with photographic texturing, 3d touch probe and 3d laser scanner. A heritage-related object was picked according to a given method For a user point of view, e.g. an architect or a 3d photographer, the knowledge of these different methods is fundamental in order to match a given object to be surveyed with the optimal survey procedure that will take full advantage of the data that the survey supplies to that user. Obviously the knowledge of the different methods is essential but so is the purpose of the project itself and the planning phase.

关键词： Measurement techniques Cultural differences Shape measurement Testing Probes Manuals Costs Metalworking machines Tiles Buildings

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Optimal and near-optimal solutions for 3d structure comparisons

Optimal and near-optimal solutions for 3D structure comparis...

引用

international symposium on 3d data processing visualization and transmission

作者： A. Caprara G. Lancia DEIS University of Bologna Bologna Italy DEI University of Padova Padova Italy

In this paper we describe exact and heuristic algorithms for the comparison of 3d structures via their contact maps. Given two contact maps, we consider the problem of finding the optimal sequence-order dependent and sequenced order independent alignments. We describe an integer programming formulation of the problems along with a Lagrangian relaxation yielding stronger bounds than previous approaches. This relaxation is used to drive both a greedy heuristic capable of finding near-optimal solutions and an exact branch-and-bound algorithm. We report computational results for an application of our model to the problem of aligning 3d structures of folded proteins from the Protein data Bank.

关键词： Proteins Lagrangian functions Linear programming Computer vision Artificial intelligence Heuristic algorithms Biology computing Application software Biological system modeling Context modeling

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