International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments最新文献_第7页

ENVIRON - Visualization of CAD Models In a Virtual Reality Environment 虚拟现实环境中CAD模型的可视化

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/079-082

E. Corseuil, A. Raposo, Romano J. M. da Silva, Marcio H. G. Pinto, G. Wagner, M. Gattass

引用次数: 28

Changes in Navigational Behaviour Produced by a Wide Field of View and a High Fidelity Visual Scene 宽视场和高保真视觉场景对导航行为的影响

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/071-078

S. Lessels, R. Ruddle

{"title":"Changes in Navigational Behaviour Produced by a Wide Field of View and a High Fidelity Visual Scene","authors":"S. Lessels, R. Ruddle","doi":"10.2312/EGVE/EGVE04/071-078","DOIUrl":"https://doi.org/10.2312/EGVE/EGVE04/071-078","url":null,"abstract":"The difficulties people frequently have navigating in virtual environments (VEs) are well known. Usually these difficulties are quantified in terms of performance (e.g., time taken or number of errors made in following a path), with these data used to compare navigation in VEs to equivalent real-world settings. However, an important cause of any performance differences is changes in people's navigational behaviour. This paper reports a study that investigated the effect of visual scene fidelity and field of view (FOV) on participants' behaviour in a navigational search task, to help identify the thresholds of fidelity that are required for efficient VE navigation. With a wide FOV (144 degrees), participants spent significantly larger proportion of their time travelling through the VE, whereas participants who used a normal FOV (48 degrees) spent significantly longer standing in one place planning where to travel. Also, participants who used a wide FOV and a high fidelity scene came significantly closer to conducting the search \"perfectly\" (visiting each place once). In an earlier real-world study, participants completed 93% of their searches perfectly and planned where to travel while they moved. Thus, navigating a high fidelity VE with a wide FOV increased the similarity between VE and real-world navigational behaviour, which has important implications for both VE design and understanding human navigation. \u0000 \u0000Detailed analysis of the errors that participants made during their non-perfect searches highlighted a dramatic difference between the two FOVs. With a narrow FOV participants often travelled right past a target without it appearing on the display, whereas with the wide FOV targets that were displayed towards the sides of participants overall FOV were often not searched, indicating a problem with the demands made by such a wide FOV display on human visual attention.","PeriodicalId":210571,"journal":{"name":"International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131561331","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: 19

A Real-Time System for Full Body Interaction with Virtual Worlds 一个与虚拟世界进行全身交互的实时系统

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/147-156

Jean-Marc Hasenfratz, M. Lapierre, F. Sillion

{"title":"A Real-Time System for Full Body Interaction with Virtual Worlds","authors":"Jean-Marc Hasenfratz, M. Lapierre, F. Sillion","doi":"10.2312/EGVE/EGVE04/147-156","DOIUrl":"https://doi.org/10.2312/EGVE/EGVE04/147-156","url":null,"abstract":"Real-time video acquisition is becoming a reality with the most recent camera technology. Three-dimensional models can be reconstructed from multiple views using visual hull carving techniques. However the combination of these approaches to obtain a moving 3D model from simultaneous video captures remains a technological challenge. In this paper we demonstrate a complete system architecture allowing the real-time (≤ 30 fps) acquisition and full-body reconstruction of one or several actors, which can then be integrated in a virtual environment. A volume of approximately 2m3 is observed with (at least) four video cameras and the video fluxes are processed to obtain a volumetric model of the moving actors. The reconstruction process uses a mixture of pipelined and parallel processing, using N individual PCs for N cameras and a central computer for integration, reconstruction and display. A surface description is obtained using a marching cubes algorithm. We discuss the overall architecture choices, with particular emphasis on the real-time constraint and latency issues, and demonstrate that a software synchronization of the video fluxes is both sufficient and efficient. The ability to reconstruct a full-body model of the actors and any additional props or elements opens the way for very natural interaction techniques using the entire body and real elements manipulated by the user, whose avatar is immersed in a virtual world.","PeriodicalId":210571,"journal":{"name":"International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132162962","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: 63

Using Saccadic Suppression to Hide Graphic Updates 使用跳动抑制隐藏图形更新

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/017-024

J. Schumacher, R. Allison, R. Herpers

{"title":"Using Saccadic Suppression to Hide Graphic Updates","authors":"J. Schumacher, R. Allison, R. Herpers","doi":"10.2312/EGVE/EGVE04/017-024","DOIUrl":"https://doi.org/10.2312/EGVE/EGVE04/017-024","url":null,"abstract":"In interactive graphics it is often necessary to introduce large changes in the image in response to updated information about the state of the system. Updating the local state immediately would lead to a sudden transient change in the image, which could be perceptually disruptive. However, introducing the correction gradually using smoothing operations increases latency and degrades precision. It would be beneficial to be able to introduce graphic updates immediately if they were not perceptible. In the paper the use of saccade-contingent updates is exploited to hide graphic updates during the period of visual suppression that accompanies a rapid, or saccadic, eye movement. \u0000 \u0000Sensitivity to many visual stimuli is known to be reduced during a change in fixation compared to when the eye is still. For example, motion of a small object is harder to detect during a rapid eye movement (saccade) than during a fixation. To evaluate if these findings generalize to large scene changes in a virtual environment, gaze behavior in a 180 degree hemispherical display was recorded and analyzed. This data was used to develop a saccade detection algorithm adapted to virtual environments. The detectability of trans-saccadic scene changes was evaluated using images of high resolution real world scenes. The images were translated by 0.4, 0.8 or 1.2 degrees of visual angle during horizontal saccades. The scene updates were rarely noticeable for saccades with a duration greater than 58 ms. The detection rate for the smallest translation was just 6.25%. Qualitatively, even when trans-saccadic scene changes were detectible, they were much less disturbing than equivalent changes in the absence of a saccade.","PeriodicalId":210571,"journal":{"name":"International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133507127","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: 13

Multi-Finger Haptic Rendering of Deformable Objects 可变形物体的多指触觉渲染

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/105-112

Anderson Maciel, Sofiane Sarni, Olivier Buchwalder, R. Boulic, D. Thalmann

引用次数: 27

An Experimental Comparison of Three Optical Trackers for Model Based Pose Determination in Virtual Reality 三种光学跟踪器在虚拟现实中基于模型姿态确定的实验比较

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/025-034

R. V. Liere, A. V. Rhijn

引用次数: 9

Medical Augmented Reality based on Commercial Image Guided Surgery 基于商业图像引导手术的医学增强现实

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/083-086

J. Fischer, M. Neff, D. Freudenstein, D. Bartz

引用次数: 64

Foveated Stereoscopic Display for the Visualization of Detailed Virtual Environments 聚焦立体显示技术在虚拟环境可视化中的应用

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/007-016

G. Godin, P. Massicotte, L. Borgeat

{"title":"Foveated Stereoscopic Display for the Visualization of Detailed Virtual Environments","authors":"G. Godin, P. Massicotte, L. Borgeat","doi":"10.2312/EGVE/EGVE04/007-016","DOIUrl":"https://doi.org/10.2312/EGVE/EGVE04/007-016","url":null,"abstract":"We present a new method for the stereoscopic display of complex virtual environments using a foveated arrangement of four images. The system runs on four rendering nodes and four projectors, for the fovea and periphery in each eye view. The use of high-resolution insets in a foveated configuration is well known. However, its extension to projector-based stereoscopic displays raises a specific issue: the visible boundary between fovea and periphery present in each eye creates a stereoscopic cue that may conflict with the perceived depth of the underlying scene. A previous solution to this problem displaces the boundary in the images to ensure that it is always positioned over stereoscopically corresponding scene locations. The new method proposed here addresses the same problem, but by relaxing the stereo matching criteria and reformulating the problem as one of spatial partitioning, all computations are performed locally on each node, and require a small and fixed amount of post-rendering processing, independent of scene complexity. We discuss this solution and present an OpenGL implementation; we also discuss acceleration techniques using culling and fragments, and illustrate the use of the method on a complex 3D textured model of a Byzantine crypt built using laser range imaging and digital photography.","PeriodicalId":210571,"journal":{"name":"International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121768201","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

Digital Mock-up database simplification with the help of view and application dependent criteria for industrial Virtual Reality application 工业虚拟现实应用中基于视图和应用相关标准的数字模型数据库简化

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/113-122

Marc Chevaldonné, M. Neveu, F. Mérienne, M. Dureigne, N. Chevassus, F. Guillaume

{"title":"Digital Mock-up database simplification with the help of view and application dependent criteria for industrial Virtual Reality application","authors":"Marc Chevaldonné, M. Neveu, F. Mérienne, M. Dureigne, N. Chevassus, F. Guillaume","doi":"10.2312/EGVE/EGVE04/113-122","DOIUrl":"https://doi.org/10.2312/EGVE/EGVE04/113-122","url":null,"abstract":"Aircraft cockpits are advanced interfaces dedicated to the interaction and exchange of observations and commands between the pilot and the flying system. The design process of cockpits is benefiting from the use of Virtual Reality technologies: early ergonomics and layout analysis through the exploration of numerous alternatives, availability all along the cockpit life cycle of a virtual product ready for experimentation, reduced usage of costly physical mock-ups. \u0000 \u0000Nevertheless, the construction of a virtual cockpit with the adequate performances is very complex. Due to the fact that the CAD based digital mock-up used for setting up the virtual cockpit is very large, one challenge is to achieve interactivity while maintaining the quality of rendering. The reduction of the information contained in the CAD database shall achieve a sufficient frame rate without degradation of the geometrical visual quality of the virtual cockpit which would alleviate the relevance of ergonomics and layout studies. \u0000 \u0000This paper proposes to control the simplification process by using objective criteria based on considerations about the cockpit application and the visual performances of human beings. First, it presents the results of studies on the characteristics of the Human Visual System linked to virtual reality and visualization applications. Illustrated by first results, it establishes how to control simplifications in a rational and automatic way.","PeriodicalId":210571,"journal":{"name":"International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116907920","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: 4

Lateral Head Tracking in Desktop Virtual Reality 桌面虚拟现实中的横向头部跟踪

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments Pub Date : 2004-06-08 DOI: 10.2312/EGVE/EGVE04/045-052

Breght R. Boschker, J. D. Mulder

引用次数: 6