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Proceedings The Fifth Pacific Conference on Computer Graphics and Applications最新文献

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Vortex flow visualization using tetrahedral cell subdivision 使用四面体单元细分的涡流可视化
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626208
A. Doi, Satoshi Suzuki, K. Koyamada, Shinji Sannakanishi
{"title":"Vortex flow visualization using tetrahedral cell subdivision","authors":"A. Doi, Satoshi Suzuki, K. Koyamada, Shinji Sannakanishi","doi":"10.1109/PCCGA.1997.626208","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626208","url":null,"abstract":"Proposes an effective technique for searching for critical points, which are points at which the velocity vector is zero. The previous method, using tetrahedral-cell subdivision, often generates multiple critical points in a hexahedral cell, and this causes several defects in flow visualization. First, we propose a new criterion for differences between interpolation functions, and investigate the reasons for the generation of multiple critical points in a hexahedral cell. Next, to prevent the generation of multiple critical points, we propose an improved method using both tetrahedral-cell subdivision and a trilinear interpolation function. Our method finds critical points by using a linear interpolation function, and, when multiple critical points are found in a hexahedral cell, a numerical integration scheme (Newton's method) is applied and a more precise position is calculated. We apply our approach to several sets of velocity data and evaluate it in several ways.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122960488","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
A visualization environment for electron microscopy 电子显微镜的可视化环境
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626203
Ioana M. Boier-Martin, D. Marinescu
{"title":"A visualization environment for electron microscopy","authors":"Ioana M. Boier-Martin, D. Marinescu","doi":"10.1109/PCCGA.1997.626203","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626203","url":null,"abstract":"Describes an environment for visualization and processing of low-dose, low-contrast electron micrographs of biological specimens. We focus on image selection, the first step in the process of reconstruction of the 3D structure of a specimen from its projections. Noise from a variety of sources makes automatic detection of particle positions a difficult task. New image acquisition devices and modern electron microscopy methods require the processing and rendering of very large images (50-100 million pixels). We describe techniques for processing large images, algorithms for detecting particle positions on compressed images using the crosspoint method, and methods for position refinement. EMMA, an interactive visualization environment for experimenting with particle identification methods is presented.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126872140","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
Incremental view-dependent multiresolution triangulation of terrain 增量视相关地形多分辨率三角测量
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626187
R. Klein, D. Cohen-Or, Tobias Hüttner
{"title":"Incremental view-dependent multiresolution triangulation of terrain","authors":"R. Klein, D. Cohen-Or, Tobias Hüttner","doi":"10.1109/PCCGA.1997.626187","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626187","url":null,"abstract":"A view-dependent multiresolution triangulation algorithm is presented for a real-time flythrough. The triangulation of the terrain is generated incrementally on-the-fly during the rendering time. We show that since the view changes smoothly only a few incremental modifications are required to update the triangulation to a new view. The resulting triangles form a multiresolution Delaunay triangulation which satisfies a predetermined view-dependent error tolerance. The presented method provides a guaranteed quality mesh since it has control over the global geometric approximation error of the multiresolution view-dependent triangulation.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116350962","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: 38
Virtual Stage: a scenario-based karaoke system in a virtual environment 虚拟舞台:基于场景的虚拟环境卡拉ok系统
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626194
K. Lee, C. Sul, Kwang-Yeon Wohn
{"title":"Virtual Stage: a scenario-based karaoke system in a virtual environment","authors":"K. Lee, C. Sul, Kwang-Yeon Wohn","doi":"10.1109/PCCGA.1997.626194","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626194","url":null,"abstract":"We describe our on-going work on Virtual Stage, a karaoke system which incorporates virtual reality technology. A runtime environment and authoring tools for interactive scenarios have been designed and implemented. We adopt a scenario-based representation to unfold a story in the virtual environment. A producer can make Virtual Stage applications which reflect his/her own scenario. While singing-along to the song played by Virtual Stage, the participants use their body to interact with virtual characters which behave intelligently in the virtual environment. The scenario written via authoring tools describes the interaction between the participant and virtual characters. The system analyzes video images of the participant to extract participant-related data, then the video image is composed into the rendered scene of a virtual environment.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113968725","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: 2
Live participant's action recognition for virtual reality interactions 虚拟现实交互中现场参与者的动作识别
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626167
L. Emering, R. Boulic, D. Thalmann
{"title":"Live participant's action recognition for virtual reality interactions","authors":"L. Emering, R. Boulic, D. Thalmann","doi":"10.1109/PCCGA.1997.626167","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626167","url":null,"abstract":"The recognition of daily human activities is a decisive interface component for more intuitive virtual reality (VR) interactions. In this paper, we describe a hierarchical model of body actions based on fine-grained action primitives. The associated recognition algorithm allows on-the-fly identification of simultaneous actions. Measurements highlight robustness to participants' variability and high detection rates when using the full potential of the action model. An example illustrates an interaction with a virtual character driven by the participant's action recognition.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132184529","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: 2
SharedWeb-a shared virtual environment over World Wide Web 共享网络——在万维网上共享的虚拟环境
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626199
Jiung-yao Huang, Chao-Tsong Fang-Tsou, Jia-Lin Chang, A. Lee
{"title":"SharedWeb-a shared virtual environment over World Wide Web","authors":"Jiung-yao Huang, Chao-Tsong Fang-Tsou, Jia-Lin Chang, A. Lee","doi":"10.1109/PCCGA.1997.626199","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626199","url":null,"abstract":"Describes the design implementation and experimental results for a multi-user 3D World Wide Web (WWW) browsing system called SharedWeb, which is based on the request-response method of a WWW server. The key features of this system include: (i) the WWW server's ability to remember all the browsers connected to it in order to transmit those messages required to maintain consistent states among the browsers, (ii) the dead-reckoning technique of distributed interactive simulation (DIS) used by the browsers in order to reduce the number of messages sent out on the network and to satisfy the timing requirement demanded by virtual environments, and (iii) the protocol data unit (PDU), also used in DIS, adapted by the SharedWeb system in order not only to include more information about the browsers but also to integrate SharedWeb with DIS in the near future.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124848514","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: 9
Fast volume rendering using adaptive block subdivision 快速体渲染使用自适应块细分
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626192
C. Lee, Kyu Ho Park
{"title":"Fast volume rendering using adaptive block subdivision","authors":"C. Lee, Kyu Ho Park","doi":"10.1109/PCCGA.1997.626192","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626192","url":null,"abstract":"We propose a fast volume rendering scheme that greatly reduces ray-casting overheads by adaptive block subdivision. We first apply a uniform space subdivision for constructing the adaptively subdivided volume. Then we merge coherent uniform blocks to generate adaptive-sized blocks that are efficient for leaping space. To accomplish this, an efficient block merging algorithm based on a boundary following and scan-filling strategy is proposed. Experimental results show that our fast volume rendering scheme is superior to other schemes in constructing a data structure for fast rendering; due to its simple construction approach, construction speed is more than three times faster than a hierarchical data structure, the octree. A 25% to 70% performance gain in rendering time over the octree is also exhibited. The additional advantages of our scheme are a stable acceleration for animation and an associativity with a compression-based volume rendering.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124072454","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
Multi-functional visualization system for structure analysis 多功能结构分析可视化系统
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626206
Katsumi Tadamura
{"title":"Multi-functional visualization system for structure analysis","authors":"Katsumi Tadamura","doi":"10.1109/PCCGA.1997.626206","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626206","url":null,"abstract":"For displaying structure analysis data on demand, we propose a multi-functional visualization system with a sophisticated graphical user interface (GUI) that reflects the observer's intention interactively and is adapted to further extension. In this system, the analysis results can be expressed in various ways by interactive operations: corresponding to the user's tentative demands, multiple physical quantities are displayed on the same screen simultaneously; for transient phenomena, animation is available; and distributed vectors and multi-layer scalar data can be observed in stereo vision. By employing the proposed system structure, analysts can easily and intuitively grasp inter-object and intra-object relationships, complicated deformations and changes of physical quantities through time in the objects.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132299577","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: 2
Template-based rendering of run-length encoded volumes 基于模板的运行长度编码卷的呈现
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626190
Cheol-Hi Lee, Yun-Mo Koo, Y. Shin
{"title":"Template-based rendering of run-length encoded volumes","authors":"Cheol-Hi Lee, Yun-Mo Koo, Y. Shin","doi":"10.1109/PCCGA.1997.626190","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626190","url":null,"abstract":"Template-based volume rendering is an acceleration technique for volume ray casting. It does not trade-off the image quality for the rendering speed. However, it still falls short of interactive manipulation of volume data, mainly due to the ray-by-ray volume access pattern and the long ray path in the transparent regions. In this paper, we present an object-order template-based volume rendering method that uses run-length encoding to enable the skipping of highly transparent regions. We present three algorithms, one for each principal axis direction. By combining the advantages of object-order volume traversal and run-length encoded volumes, the algorithms achieve high-quality rendering in a much shorter time than the original template-based volume rendering.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116906372","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: 15
"Skeleton climbing": fast isosurfaces with fewer triangles “骨架攀登”:快速等面与较少的三角形
Proceedings The Fifth Pacific Conference on Computer Graphics and Applications Pub Date : 1997-10-13 DOI: 10.1109/PCCGA.1997.626185
T. Poston, H. Nguyen, P. Heng, T. Wong
{"title":"\"Skeleton climbing\": fast isosurfaces with fewer triangles","authors":"T. Poston, H. Nguyen, P. Heng, T. Wong","doi":"10.1109/PCCGA.1997.626185","DOIUrl":"https://doi.org/10.1109/PCCGA.1997.626185","url":null,"abstract":"Skeleton climbing is an algorithm that builds triangulated isosurfaces in 3D grid data, more economically than marching cubes, and without the time penalty of current mesh decimation algorithms. Building the surface from its intersections with grid edges (1-skeleton), then faces (2-skeleton), then cubes (3-skeleton), treats the data in a uniform way; this allows a 25% reduction in the number of triangles produced, while still creating a true separating surface at similar speed.","PeriodicalId":128371,"journal":{"name":"Proceedings The Fifth Pacific Conference on Computer Graphics and Applications","volume":"43 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129714862","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: 15
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