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IEEE Conference on Robotics, Automation and Mechatronics

作者： Zhuo Yu Xiaohui Liang Zhiyu Chen State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University China

Level of detail (LOD) selection method is a key component in complex scene rendering and is widely used in time-critical systems. Many studies focus their efforts on developing the LOD selection method to deal with the problem which the scene contains small objects or objects with a single type. This paper gives a LOD selection method handling the situation that the scene contains multi-type objects while the data amount of these objects change dramatically. The preprocessing step of our work is using the extreme simplification way to simplify the objects with large number of primitives and using the quadric error metrics to simplify the small ones. Then we calculate the span of level changed to each type of object separately. In runtime, we organize all the objects into a max heap by using the importance factor for rendering. We get the top element of the heap and change its level until the total data of objects satisfy the condition of time-critical method. Compared to existing solutions, our method is more suitable to the situation when the scene contains different type of objects.

关键词： Layout Time factors virtual reality computer science Military computing Runtime Data acquisition virtual environment Application software computer applications

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A collaborative virtual assembly system based on mobile devices

A collaborative virtual assembly system based on mobile devi...

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computer Systems Architecture Conference (ACSAC), Australasian

作者： Xiaohui Liang Zhiying He Xiaoxiao Wu State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

Adding mobile devices to virtual environment and using them as interactive tool can enhance mobility and the sense of immersion. This paper researches on how to let multi-users work collaboratively through mobile devices in a virtual environment and develops a PDA-based collaborative virtual assembly system supporting multi-user participant. The system let users directly interact with virtual environment through the manipulation of the objects displayed on the PDAs, which makes interaction more intuitive. In this paper, we introduce the main modules of the system, including the data transmission service module and display/interaction module.

关键词： Personal digital assistants Servers Data communication Mobile handsets virtual environment Three dimensional displays Geometry

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A Multilayer Portal Model for Information Grid

A Multilayer Portal Model for Information Grid

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ChinaGrid Annual Conference (ChinaGrid)

作者： Xiaowu Chen Mingji Chen Xixi Luo State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769533063

Grid portal is the point of access to a grid system, it provides a friendly portal interface for grid users. Most computing grid uses grid portal to facilitate scientists to access computing resources through job submission, job monitoring, file transferring and so on. And information grid portal is to seamlessly get information for grid users, since information grid is a system that utilizes grid technology to implement information sharing, information management and providing information services. University digital museum grid (UDMGrid) is a typical system of information grid, whose portal is to seamlessly access digital specimens by a one-stop information service. With the developments of information grid, semantic Web and portal model, this paper presents a multilayer portal model for information grid. This model is composed of multiple layers, which include grid resource layer, grid service layer, portlet service layer, portlet layer, application service layer and user layer. The application and experiment of this multilayer portal model in UDMGrid demonstrate its usability, maintainability and expansibility.

关键词： Portals Ontologies Information services Nonhomogeneous media Visualization Semantic web Middleware

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A Caching and Prefetching Scheme Based on the Degree of Attention about Object's Attributes (DAOA) in Distributed virtual Environment

A Caching and Prefetching Scheme Based on the Degree of Atte...

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International Symposium on Intelligent Information technology Application, IITA

作者： Ke Xie Xiaohui Liang State Key Laboratory of Virtual Reality Technology and Systems School of computer science and engineering Beihang University Beijing China

For supporting real-time interaction in distributed virtual reality application (DVR), it is common to distribute all geometry data to clients from server before the start of the application. For efficient replication, two schemes are used in general - prioritized transfer of objects and caching and prefetching technique. The existing caching and prefetching approaches are mostly based on the information of avatarpsilas geometric attributes. However, these information failed to determine which types of objects are more important to an individual avatar. To solve this problem, we propose a data management scheme using integrated information, including geometric attributes and non-geometric attributes. Then we give a prefetching and caching scheme according to the integrated information. In the end, the simulation experiment shows that our method can reflect the avatar's degree of attention to those objects in DVR better than other previous methods.

关键词： Prefetching virtual environment Avatars virtual reality Application software Information geometry Information technology computer science Data engineering Real time systems

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A Robust Speaker Recognition Approach Based on Model Compensation

A Robust Speaker Recognition Approach Based on Model Compens...

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9th International Conference on Signal Processing(第九届国际信号处理学术会议)(ICSP'08)

作者： Yun-Xiao Geng Wei Wu State Key Laboratory of Virtual Reality Technology and Systems BeijingChina School of Computer Science Beihang UniversityBeijingChina

Model compensation is an important means to improve the robustness of speaker recognition in noise *** robust speaker recognition approach based on model compensation is proposed in this *** proposed method combines data reliability estimation and feature components effectiveness estimation,so the errors of the second kind due to the estimation error are reduced *** proposed method estimates the reliability of data in time-frequency domain based on the fuzzy reasoning,and estimates the effectiveness of feature components in the current *** according to the result of estimation,the model compensation in the noise environment is determined based on fuzzy reasoning to improve the robustness of speaker *** experiments compared the proposed method to the missing data and feature selection combined *** results showed that the proposed method is more effective in different noise environment.

关键词： Speaker recognition Working environment noise Noise robustness Estimation error Fuzzy reasoning Data processing Speech recognition Time frequency analysis Noise level virtual reality

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基于LOD的地物与地形融合与绘制

基于LOD的地物与地形融合与绘制

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第六届智能CAD与数字娱乐学术会议

作者： Chen Guojun 陈国军 Chen Qinggang 陈庆刚 Cui Baolei 崔保磊 College of Computer and Communication Engineering China University of Petroleum Dongying 257061Ch 中国石油大学计算机与通信工程学院山东东营257061 State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191C 北京航空航天大学虚拟现实技术与系统国家重点实验室北京100191

地表特征物与地形的融合对三维虚拟环境真实感有重要作用。核心问题是特征物模型与地形模型在数据层次的融合。本文针对基于规则网格绘制的地形与地表特征物的融合问题，提出一种通过扩展变化单元格分辨率，用更精细的三角形的描述特征... 详细信息

地表特征物与地形的融合对三维虚拟环境真实感有重要作用。核心问题是特征物模型与地形模型在数据层次的融合。本文针对基于规则网格绘制的地形与地表特征物的融合问题，提出一种通过扩展变化单元格分辨率，用更精细的三角形的描述特征物轮廓，结合视点相关的LOD简化技术建立地形和特征物的多分辨率模型的方法，并增加过渡区域解决由相邻单元格分辨率不一致导致的裂缝问题。实验表明，该方法的融合效果逼真，且对地形实时绘制影响较小。

关键词：数据融合细节层次模型图形绘制虚拟环境

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A Feature Point Matching Based Approach for Video Objects Segmentation

A Feature Point Matching Based Approach for Video Objects Se...

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2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Yan Zhang Zhong Zhou Wei Wu State Key Laboratory of Virtual Reality Technology and Systems Beijing P.R.China School of Computer Science and Engineering Beihang University Beijing P.R.China

In this paper, we propose an approach to segment the multiple objects in video. For a video sequence with stationary background, our approach combines the feature points with the color and contrast information to extract the multiple objects of different sizes. The idea is that the local features of the feature points are more robust than that of the pixels, and more accurate than the global color feature. So we integrate the local cues of the feature points into the basic color model in graph cut. Our method matches the feature points in the known background and the current image, and classifies them in three categories. Then the influences to their neighbor pixels are computed according to the category, and integrated in the pixels' color model. The max-flow algorithm is applied to obtain the last result of the segmentation. Experimental results demonstrate the effectiveness of our approach.

关键词： Image color analysis Pixel Colored noise Noise Image segmentation Computational modeling Object segmentation

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JobGrid: Chinese College Graduates Employment Information Grid System

JobGrid: Chinese College Graduates Employment Information Gr...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Feng Zhao Bin Zhou Xiaoxing Sun Hai Jin Song Wu School of Computer Science and Technology Huazhong University of Science & Technology Wuhan China Cluster and Grid Computing Lab Wuhan China The State Key Laboratory of Virtual Reality Technology and Systems Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769533063

This paper proposes a realistic data grid system named JobGrid to construct information platform for Chinese college graduates employment, which supports centralized transaction processing to ensure consistent, effective operation in data access, control, monitor and analysis, and distributed data management to provide heterogeneous data integration, conversion, exaction and export. JobGrid has implemented global uniform view and massively heterogeneous data access, and provided efficiently data and transactions processing and cooperative control mechanism for distributed resource over grid.

关键词： Databases Educational institutions Distributed databases Servers Monitoring computer architecture Employment

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

No abstract available

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SIVP: a toolkit for integrating visualization into virtual environment

SIVP: a toolkit for integrating visualization into virtual e...

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16th International Conference on Artificial reality and Telexistence - Workshops, ICAT 2006

作者： Liang, Xiaohui Che, Yinghui Wu, Xiaoxiao Key Laboratory of Virtual Reality Technology School of Computer Sciences Beihang University Beijing China

ISBN: (纸本)076952754X

None-visible data modeling and representation is one of the key topics in virtual reality, since it greatly affects the sense of the user. In this paper we present how to visualize none-visible data in the virtual environment and a toolkit called Synthetic Information Visualization Platform (SIVP) is given. This toolkit includes two processes and the main components of SIVP are describes. Finally, we demonstrate some works base on SIVP. © 2006 IEEE.

关键词： virtual reality

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