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检索条件"任意字段=Conference on Computer Graphics, Imaging and Visualisation"

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Distributing stereoscopic scientific visualisation across the grid

Distributing stereoscopic scientific visualisation across th...

引用

Proceedings of the Seventh IASTED International conference on computer graphics and imaging

作者： Charters, Stuart M. Holliman, Nicolas S. Munro, Malcolm Visualisation Research Group e-Science Research Institute University of Durham South Road Durham DH1 3LE United Kingdom

An architecture that allows stereoscopic scientific visualisation to be distributed across the grid is presented. As the quantity of data generated by scientists increases so does the need for tools to analyse and interpret that data: visualisation is one such tool. The architecture presented allows resources distributed across the grid to be brought together and allows scientists to build effective stereoscopic visualisations that can provide insight and help in the understanding of the data being analysed.

关键词： Special effects

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visualisation within a multisensorial surgical planner

Visualisation within a multisensorial surgical planner

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2nd International conference on computer graphics, imaging and Vision (CGVIS 2005)

作者： Clapworthy, GJ Krokos, M Mayoral, R Liang, R Podgorelec, D Univ Luton Dept Comp & Informat Syst Luton LU1 3JU Beds England

ISBN: (纸本)0769523927

This paper describes the visualisation components associated with a new environment,for the pre-operative planning of total hip replacement. The system has a multisensorial immersive interface (stereoscopic display, several six-degrees-of-freedom tracking technologies, speech recognition and control, and haptic feedback) and includes advanced software visualisation and evaluation modules for both planning the operation and evaluating the likely outcomes.

关键词： virtual reality pre-operative planner total hip replacement multi modal/multisensorial interface

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Visualization of astrophysical simulations using IDL object graphics

Visualization of astrophysical simulations using IDL object ...

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conference on computer graphics, imaging and visualisation

作者： Pomarede, D. Audit, E. Brun, A. S. Gautard, V. Masset, F. Teyssier, R. Thooris, B. CEA/DSM/DAPNIA SEDI/LILAS and SAp

ISBN: (纸本)9780769529288

The ability to interactively visualize the complex products of three-dimensional simulations is a key aspect in the validation and verification process of numerical algorithms and frameworks. Computational astrophysics, which benefits from the rapidly increasing computing resources offered by the use of massively parallel mainframes, is a challenging playground to scientific visualization. In this paper, we describe a graphical package developed in the framework of IDL Object graphics. The requirements governing its design are defined in the context of the COAST software project which aims at providing an ensemble of enabling tools and techniques for the development and the validation of major simulation codes. This covers a wide range of applications, including cosmological formation of large-scale structures, turbulences in the interstellar medium, stellar magnetohydrodynamics, and formation of proto-planetary systems. The use of IDL Object graphics provides an interactive and immersive visualization of complex scenes where various fields of different nature are entangled. Three-dimensional scalar and vector fields distributed over regular mesh grids or more complex structures such as Adaptive Mesh Refinement data, as well as N-body systems, can be visualized in a number of different, complementary ways.

关键词： scientific visualization data visualization visualization frameworks and infrastructures visualization tools and applications

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An algorithm for JPEG compressing with chaotic encrypting

An algorithm for JPEG compressing with chaotic encrypting

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Huang, Yuanshi Xu, Rongcong Lin, Weiqiang College of Mathematics and Computer Science Fuzhou University Fujian 350002 China

ISBN: (纸本)0769526063

In the paper, we bring forward an image encryption algorithm during the process of JPEG compression. According to the chaotic theory of dynamic systems and modern cryptography, we solved the following technique, First, how to generate chaotic sequence having good randomness according to the characteristic that Logistic chaotic systems are extremely sensitive to the initial condition? Secondly, how to create a series of one-way hash being as block key from the chaotic sequences? Thirdly, during the process of JPEG compression coding, how to implement the image compression and encryption by using the block cipher? In the analysis of the algorithm, we discuss the randomness of the chaotic sequence in detail. We also analyze the security and anti-collision of the chaotic hash sequence by several variant methods. The results indicate that our algorithm completely satisfied the security requirement in the sense of cryptography.

关键词： Image compression

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3D visualization of hierarchical clustered web search results

3D visualization of hierarchical clustered web search result...

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conference on computer graphics, imaging and visualisation

作者： Akhavi, Mehrnaz Sadat Rahmati, Mohammad Amini, Nerssi Nasiri Amirkabir Univ Technol Dept Comp Engn Tehran Iran Iran Univ Sci & Technol Comp Engn Dept Tehran Iran

ISBN: (纸本)9780769529288

The immaturity of semantic search engines has initiated researchers to apply various novel post-processing techniques on traditional search engine results among which clustering routines are most conspicuous. While many of these routines are focused on hierarchical clustering, little has been done toward an effective visualization of such data. Due to the richness of information observed in 3D in comparison with 2D (because of its abundant visual cues), we have proposed an intuitive 3D metaphor for the visualization of hierarchical clustered results. Our metaphor is based on fractal trees which are usually constructed by linear recursive algorithms traversing node-link hierarchies. The search results of different hierarchical clustering algorithms shall be visualized as either single-tree or forest metaphors which are user's customizable alternatives in our implemented prototype. In the forest depiction, our approach is even applicable to flat clustered results.

关键词： search results visualization tree visualization hierarchical clustering virtual reality human-computer interfaces

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Hairstyle construction from raw surface data

Hairstyle construction from raw surface data

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Sobottka, Gerrit Kusak, Michael Weber, Andreas Institute of Computer Science II University of Bonn Germany

ISBN: (纸本)0769526063

We present a novel approach to the problem of hairstyle construction from raw surface data such as the ones obtained from surface scans. Our approach is based on a shape matching algorithm that fits individual hair fibers into a given volume according to a set of boundary conditions and additional hair density information. Our method employs a mechanical rod model based on the special theory of Cosserat rods. Such models can efficiently be used to simulate the deformation of individual fibers in subsequent manipulation steps. © 2006 IEEE.

关键词： computer graphics

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A shadow buffer technique for simulating snow-covered shapes

A shadow buffer technique for simulating snow-covered shapes

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Tokoi, Kohe Wakayama University

ISBN: (纸本)0769526063

Displaying a natural phenomenon is effective for improving the reality of computer graphics. A display of snow especially plays an important role in expressing a sense of the season. However, since geometric modeling of the various shapes of snow by hand is very troublesome, it is desirable that snow coverage shapes be automatically generated by simulation. This paper proposes a high-speed modeling technique of snow coverage. This technique takes account of the following three conditions: "snowfall blocked by an object," "irregular motion of falling snow," and "drifting snow." It applies the shadow buffer method to detect an object which blocks snowfall, calculates the influence of irregular motion of snow, and then determines the final snow-covered shape by moving the snow to a stable position. © 2006 IEEE.

关键词： computer graphics

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Approaching effective data visualisation in a research setting

Approaching effective data visualisation in a research setti...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Titchener, Mark R. Department of CS University of Auckland Private Bag Auckland New Zealand

ISBN: (纸本)0769526063

A general purpose, easy-to-use graphical visualisation tool has been developed to facilitate the display of experiment data. It supports simultaneous or selective rendering of surfaces, graphs and animated traces in a virtual 3D environment. It can accept as many as 100,000 objects for animated replay, and allows for interactive control of viewing position, lighting and other display parameters. The viewer is thus well suited to scoping experiment results, visually debugging data processing algorithms, and presenting complex data. Its principal application is in the visualisation of surfaces and graphs in the entropy analysis of medical and industrial related time-series.

关键词： Data reduction

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Rate-distortion optimized progressive geometry compression

Rate-distortion optimized progressive geometry compression

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Zhang, WenBo Liu, Bo Zhang, Hongbin Computer Institute Beijing University of Technology Beijing 100022 China

ISBN: (纸本)0769526063

During progressive transmission of 3D geometry models, the transmission order of details at different region has great effects on the quality of reconstructed models at low bit-rate. This work presents a rate-distortion (R-D) optimized progressive geometry compression scheme to improve the quality of reconstructed models by adjusting the transmission order of details. In this scheme, the input mesh is partitioned into parts, then each part is encoded into bit-stream independently, and the encoded bit-streams are truncated into segments while getting the R-D characteristics of every segment, at last all segments are assembled into a codestream based on R-D optimization, which ensure the region with rich detail will be transmitted early and make the reconstructed mesh achieve better quality as soon as possible. Experimental results show that, as compared with the well-known PGC method, the proposed one provides better R-D performance. Moreover, it provides a novel way to realize the region of interest (ROI) coding of 3D meshes. © 2006 IEEE.

关键词： Image compression

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Individual Avatar Skeletal based Animation Feedback for Assisted Motion Control 15

Individual Avatar Skeletal based Animation Feedback for Assi...

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15th International Joint conference on computer Vision, imaging and computer graphics Theory and Applications (VISIGRAPP) / 15th International conference on computer Vision Theory and Applications (VISAPP)

作者： Lehmann, Lars Wiede, Christian Hirtz, Gangolf Chemnitz Univ Digital Signal Proc & Circuit Technol Reichenhainer Str 70 Chemnitz Germany Fraunhofer IMS Finkenstr 61 Duisburg Germany

ISBN: (纸本)9789897584022

In medical training therapy (MTT), the precise execution of the training exercises is of decisive importance for the success of the therapy. Currently, a therapist has to treat up to 15 patients simultaneously on an outpatient basis. Recently an assistance system that can assess both the quantity and the quality of movement was developed. A feedback system models target-oriented recommendations for actions and communicates them directly to the patient. A hardware accelerated visualisation system using OpenGL and GLSL shaders was realised to animate a real-time rendered 3D mesh connected to an extracted motion skeleton. An avatar visualises the error by colouring the body regions with traffic light trenches. The individualisation of the underlying three-dimensional avatar increases the willingness of the patients to participate in the exercises which they perform autonomously without the supervision of therapists.

关键词： visualisation Feedback Control Assisted Motion Control Motion Error Detection 3D Realtime Animation

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