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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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Octree-based fusion of shape from silhouette and shape from structured light

Octree-based fusion of shape from silhouette and shape from ...

引用

international symposium on 3d data processing visualization and transmission

作者： M. Kampel S. Tosovic R. Sablatnig Institute of Computer Aided Automation University of Technology Vienna Vienna Austria

An algorithm for the automatic construction of a 3d model of archaeological vessels using two different 3d algorithms is presented. In archeology the determination of the exact volume of arbitrary vessels is of importance since this provides information about the manufacturer and the usage of the vessel. To acquire the 3d shape of objects with handles is complicated, since occlusions of the object's surface are introduced by the handle and can only be resolved by taking multiple views. Therefore, the 3d reconstruction is based on a sequence of images of the object taken from different viewpoints with different algorithms; shape from silhouette and shape from structured light. The output of both algorithms are then used to construct a single 3d model. Results of the algorithm developed are presented for both synthetic and real input images.

关键词： Shape Image reconstruction Cameras Automation Pattern recognition Image processing Manufacturing Ceramics Iterative algorithms

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Network protocol for interaction and scalable distributed visualization

Network protocol for interaction and scalable distributed vi...

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international symposium on 3d data processing visualization and transmission

作者： J.-M. Frahm J.-F. Evers-Senne R. Koch Institute for Computer Science and Applied Mathematics Christian-Albrechts University Germany

In the last decade the visualization of virtual environments and interaction within was possible only with specialized hardware. This hardware was very expensive, had a lack of scalability and used specific protocols, buses, networks for communication and specialized graphics hardware for visualization. We present a simple protocol for synchronized distributed scalable visualization and interaction processing in distributed environments. The goal of our protocol is that it can run with standard network protocols like TCP/IP and UdP and standard hardware. It is easy to integrate our protocol into every OpenGL based visualization but the approach is not restricted to OpenGL. These design issues can be used to integrate every standard acceleration for visualization like distributed rendering. We focus on synchronized multiview visualization.

关键词： Hardware Graphics Computer architecture Rendering (computer graphics) Virtual environment Scalability data visualization Multicast protocols Computer science Mathematics

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direct and robust voxelization and polygonization of free-form CSG solids

Direct and robust voxelization and polygonization of free-fo...

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international symposium on 3d data processing visualization and transmission

作者： J. Ruiz de Miras F.R. Feito Departamento de Informática University of Jaén Jaen Spain

We present two robust and direct algorithms for both voxelization and polygonization of solids constructed as Boolean combinations of free-form solids (free-form CSG solids). These algorithms are based on the extended simplicial chain (ESC) model; they are robust as they are fully based on a point in solid test (derived from the ESC model) that does not need either solving of equation systems or dealing with complex special cases. Final results are directly obtained from CSG expression, without evaluating Boolean operations. Both algorithms have been developed by looking for an agreement between the result precision and the computation cost.

关键词： Robustness Solid modeling Equations Government System testing Computational efficiency Merging data processing data visualization

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Visualizing I/O predictability

Visualizing I/O predictability

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international symposium on 3d data processing visualization and transmission

作者： A. Luo A. Amer S. Speidel d.d.E. Long A. Pang Jack Baskin School of Engineering University of California Santa Cruz USA

We propose a novel method to study storage system predictability based on the visualization of file successor entropy, a form of conditional entropy drawn from a file access trace. First-order conditional entropy can be used as a measure of predictability It is superior to the more common measures such as independent likelihood of data access. For file access data, we developed a visualization tool that produces 3d graphical views of the variation in predictability of successive access events on a per-file basis. Our visualization tool provides interactive observation of the variations in predictability according to some arbitrary criterion, e.g. time of day, program identifier, user groups, or any other classification of files. Four entropy data sets were extracted from various file system traces. These four data sets are representative of the variability in file access patterns for different machine use: server personal workstation, large number of interactive users, and heavy write activity. visualization results show that there is strong predictability among files and optimizations would be profitable.

关键词： data visualization Entropy File systems Lifting equipment data mining File servers Workstations Bandwidth Prefetching data processing

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3d reality modelling: photo-realistic 3d models of real world scenes

3D reality modelling: photo-realistic 3D models of real worl...

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international symposium on 3d data processing visualization and transmission

作者： V. Sequeira J.G.M. Goncalves Joint Research Centre European Commission Ispra Varese Italy

This paper presents a 3d reality modelling system, applying lasers and digital photography to create super-accurate photo-realistic three-dimensional worlds. A key feature of the 3d reality system is its flexibility. It can be used with all common long-range scanners and digital or video cameras, without the need of any pre-calibration or static arrangement between the different sensors. The system can be used for a wide range of applications in industry and science, as well as for environmental modelling and virtual reality presentations. The 3d models are sufficiently lifelike to be used in sectors such as real estate, cultural heritage and construction. Results can be exported to all major 3d software and CAd packages or viewed via a Web browser.

关键词： Layout Laser modes digital photography digital cameras Application software Construction industry Virtual reality Cultural differences Software packages Packaging

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3d shape estimation based on density driven model fitting

3D shape estimation based on density driven model fitting

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international symposium on 3d data processing visualization and transmission

作者： E. Borovikov L. davis Department of Computer Science University of Maryland College Park MD USA

We introduce a generic and efficient method for 2d and 3d shape estimation via density fields. Our method models shape as a density map and uses the notion of density to fit a model to a rapidly computed occupancy map of the foreground object. We show how to utilize hierarchical (pyramid-like) object segmentation data to regularize a hierarchical model fitting. With primary focus on estimating 3d shapes of nonrigid articulated objects such as human bodies, we illustrate our approach with examples of efficient model fitting to 3d occupancy maps of human figures. We also discuss a number of extensions of our method to applications involving nonrigid object tracking and movement analysis.

关键词： Shape Humans Biological system modeling Piecewise linear approximation Surface reconstruction Skeleton Solid modeling Topology Surface emitting lasers Computer science

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description of simple method in 3d reconstruction in medical imaging

Description of simple method in 3D reconstruction in medical...

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international symposium on 3d data processing visualization and transmission

作者： C. Marchessoux N. Richard C. Fernandez IRCOM SIC Laboratory Chasseneuil France

The aim of this study is to present research made in a 3d scanner conception of a human foot. The first step of foot reconstruction is treated. The cloud number points is increased thanks to a combination of several methods. The first method for the first points extraction is explained. The relative length, height and width of the object are obtained in order to construct the parallelepiped including the foot. All parallelepiped points are virtually assigned to foot points. Each image is projected in the volume in the different planes of the views in order to eliminate the exterior points. From the volume of all these points only the points of the surface are retained. The points of the cloud should be located on or outside the surface of the foot. This reconstruction must be ameliorated by an active triangulation. We use the tools of matching points of stereovision in the image profiles.

关键词： Image reconstruction Biomedical imaging Foot Clouds Cameras Humans Orthopedic surgery Laboratories Footwear industry data visualization

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Advances in mesh signal processing and geometry compression

Advances in mesh signal processing and geometry compression

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international symposium on 3d data processing visualization and transmission

作者： G. Taubin IBM Thomas J. Watson Research Center USA

Summary form only given. Several closely related methods have been proposed in recent years to smooth, denoise, edit, compress, transmit, and animate very large polygon meshes, based on topological and combinatorial methods, signal processing techniques, constrained energy minimization, and the solution of diffusion differential equations. In particular, polygon models, which are used in most graphics applications, require considerable amounts of storage, even when they only approximate precise shapes with limited accuracy. To support the Internet access to 3d models of complex virtual environments or assemblies for electronic shopping, collaborative CAd, multi-player video games, scientific visualization, representations of 3d shapes must be compressed by several orders of magnitude. The author provides a quick overview of the mesh signal processing approach. Then he describes in more detail some recent results and applications: linear anisotropic mesh filtering, bi-level isosurface compression, and space-optimized texture maps.

关键词： Signal processing Geometry Shape Animation Minimization methods differential equations Graphics Internet Virtual environment Assembly

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Coding with ASCII: compact, yet text-based 3d content

Coding with ASCII: compact, yet text-based 3D content

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international symposium on 3d data processing visualization and transmission

作者： M. Isenburg J. Snoeyink I.N.R.I.A. Sophia Antipolis France University of North Carolina at Chapel Hill and INRIA Sophia-Antipolis USA University of North Carolina at Chapel Hill and INRIA Sophia-Antipolis

Because of the convenience of a text-based format 3d content is often published in the form of a gzipped file that contains an ASCII description of the scene graph. While compressed image, audio, and video data is kept in separate binary files, polygon meshes and interpolators are usually included uncompressed into the ASCII description, as there is no widely-accepted standard for such data. We show how to use compressed polygon meshes and compressed interpolators within a purely text-based format. Our scheme codes these data-heavy nodes as ASCII strings that compress well with standard gzip compression. Specifically we demonstrate the efficiency of this technique on a sparse scene composed of many small polygon meshes. While typical for 3d content on the Web, such scenes tend to be more difficult to compress.

关键词： Layout Image coding Video compression Transform coding Lifting equipment Code standards Virtual reality visualization Humans Software packages

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Concentric strips: algorithms and architecture for the compression/decompression of triangle meshes

Concentric strips: algorithms and architecture for the compr...

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international symposium on 3d data processing visualization and transmission

作者： P.N. Mallon M. Boo M. Amor J.d. Bruguera Department of Electronic and Computer Engineering University of Santiago de Compostela Spain Department of Electronic and Systems University of A Coruna Spain

The complexity of triangle meshes is growing rapidly due to the need for higher accuracy. As a consequence, the network transmission delay of 3d graphics data is the major bottleneck in computer graphics. An interesting solution to this limited bandwidth is the compression technique. This solution implies the necessity of specific hardware to reconstruct the mesh at the entrance of the graphics pipeline. In this work we present a new compression connectivity algorithm for triangle meshes. This is a simple algorithm which improves the compression ratio (nearly 1.5 bits/triangle) by previously reported schemes. due to its simplicity, it is very suitable for hardware implementation. This implementation has a simple and efficient structure, low storage requirements and a reconstruction rate of one triangle per cycle.

关键词： Strips Hardware Pipelines Computer graphics Contracts Tree graphs Computer architecture Bandwidth Surface reconstruction data processing

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