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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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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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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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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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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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A practical approach for 3d model indexing by combining local and global invariants

A practical approach for 3D model indexing by combining loca...

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international symposium on 3d data processing visualization and transmission

作者： J.-P. Vandeborre V. Couillet M. daoudi ENIC Telecom Lille I Villeneuve d'Ascq France

In this paper we present a three-dimensional model retrieval system. In our approach, a three-dimensional model is described by three invariant descriptors: a curvature index which consists of a histogram of the principal curvatures of each face of the mesh, a histogram of distances between the faces, and a histogram of the volumes based on each face. This work focuses on extracting these invariant descriptors from the three-dimensional models, and on combining these descriptors in order to improve retrieval performance. An experimental evaluation demonstrates the satisfactory performance of our approach on a fifty three-dimensional model database.

关键词： Indexing Noise robustness Histograms Noise shaping Image databases Graphics Acceleration Hardware Shape measurement Telecommunications

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Archiving 3d cultural objects with surface point-wise database information

Archiving 3D cultural objects with surface point-wise databa...

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international symposium on 3d data processing visualization and transmission

作者： N. Tsirliganis G. Pavlidis A. Koutsoudis d. Papadopoulou A. Tsompanopoulos K. Stavroglou Z. Loukou C. Chamzas Cultural and Educational Technology Institute Xanthi Greece

Recent developments in 3d technologies and measurement instrumentation combined with multimedia databases offer today new possibilities for the integrated and complete description of cultural heritage objects. A first attempt is made to develop a database for archaeological ceramic and glass artifacts where in addition to the digitized 2d and 3d images, description, typological characteristics and historical information for each artifact will also include point-wise surface data. In a pilot implementation, physicochemical data mapped on the surface of the 3d digital image of the object will be included. Thus, the researcher will have the entire information regarding the specific artifact at his disposal. This information will contribute significantly to the comparative study of artifacts, provenance studies, determination of weathering, authentication and detection of forgery, inspection of past restorations etc.

关键词： Cultural differences Instruments Multimedia databases Image databases Ceramics Glass digital images Authentication Forgery Inspection

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Long-range high-performance time-of-flight-based 3d imaging sensors

Long-range high-performance time-of-flight-based 3D imaging ...

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international symposium on 3d data processing visualization and transmission

作者： A. Ullrich N. Studnicka J. Riegl S. Orlandini RIEGL Laser Measurement Systems Horn Austria Nikon Instruments S.p.A. Sesto Italy

A family of high-performance 3d imaging laser sensors are presented providing rapid acquisition of 3d data of naturally reflecting objects within a wide field-of-view and with ranges up to 1000 meters. Beside the basic 3d-information the sensors also supply, pixel for pixel, true color information gained by an additional passive channel. This color information allows an instantaneous automatic texturing of 3d models. The sensors are of a rugged and compact design and can thus be used even under adverse environmental conditions. Potential applications include scene acquisition for virtual reality modeling, 3d-imaging of large buildings in the field of architecture, topographic mapping and dimensional measurements of vessels, furnaces, tanks, etc. The sensor makes use of high-speed laser ranging based on the time-of-flight method using a pulsed laser source in combination with precise mechanical scanning of the measuring beam. data are provided at a standard parallel interface allowing easy integration with any standard PC based system for data visualization and data processing. These data are provided with an average data rate up to 18000 measurements per second. Examples of data acquired with the sensors are presented, accuracy and ranging capability are discussed.

关键词： Image sensors Mechanical sensors Laser modes Pulse measurements Layout Virtual reality Buildings Architecture Furnaces Optical pulses

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Surface reconstruction from multiple views using rational B-splines and knot insertion

Surface reconstruction from multiple views using rational B-...

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international symposium on 3d data processing visualization and transmission

作者： M. Siddiqui S. Sclaroff Cogency Technology Inc. Natick MA USA Computer Science Department Boston University Boston MA USA

A method for reconstructing 3d rational B-spline surfaces from multiple views is proposed. Given corresponding features in multiple views, though not necessarily visible in all views, the surface is reconstructed. First 2d B-spline patches are fitted to each view. The 3d B-spline and projection matrices can then be extracted from the 2d B-splines using factorization methods. The surface fit is then further refined via an iterative procedure. Finally, a hierarchal fitting scheme is proposed to allow modeling of complex surfaces by means of knot insertion. Experiments with real imagery demonstrate the efficacy of the approach.

关键词： Surface reconstruction Spline Surface fitting Layout Image reconstruction Surface treatment Cameras Computer science transmission line matrix methods Iterative algorithms

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