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检索条件"机构=Key Laboratory of Computer Vision and Virtual Reality Technology"

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A Visualization of Large-scale Terrain Algorithm Based on LOD

A Visualization of Large-scale Terrain Algorithm Based on LO...

引用

2011 4th IEEE International Conference on computer Science and Information technology(ICCSIT 2011)

作者： Yu Ping Chen Guojun Department of Information Science and Technology Zibo Normal College College of Computer and Communication Engineering China University of Petroleum State Key Laboratory of Virtual Reality Technology and Systems Beihang University

ISBN: (纸本)9781612848334

Terrain visualization plays important role in the area of computer graphics. To meet the special requirements in visualization of large-scale terrain, an algorithm based on Level of Detail （LOD） is proposed for large-scale terrain visualization in real time. Triangle bin-tree is used in the algorithm to simplify the procedure of terrain, and a novel nested error metric sphere is proposed to compute errors based on screen and roughness which avoids T-junction and crack. To improve efficiency, presented method takes advantage of frame coherence to make location adjustment between the two required LODs, and uses time delay to reduce the frequency in computing error in each frame simultaneously. Experiments demonstrate that the algorithm reduces the calculation effectively, and represents the large-scale terrain very well in real time.

关键词： LOD error calculation frame coherence

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iHandRehab: An interactive hand exoskeleton for active and passive rehabilitation

iHandRehab: An interactive hand exoskeleton for active and p...

引用

IEEE International Conference on Rehabilitation Robotics (ICORR)

作者： Jiting Li Ruoyin Zheng Yuru Zhang Jianchu Yao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Department of Engineering College of Technology and Computer Science East Carolina University Greenville NC USA

This paper presents an interactive exoskeleton device for hand rehabilitation, iHandRehab, which aims to satisfy the essential requirements for both active and passive rehabilitation motions. iHandRehab is comprised of exoskeletons for the thumb and index finger. These exoskeletons are driven by distant actuation modules through a cable/sheath transmission mechanism. The exoskeleton for each finger has 4 degrees of freedom (DOF), providing independent control for all finger joints. The joint motion is accomplished by a parallelogram mechanism so that the joints of the device and their corresponding finger joints have the same angular displacement when they rotate. Thanks to this design, the joint angles can be measured by sensors real time and high level motion control is therefore made very simple without the need of complicated kinematics. The paper also discusses important issues when the device is used by different patients, including its adjustable joint range of motion (ROM) and adjustable range of phalanx length (ROPL). Experimentally collected data show that the achieved ROM is close to that of a healthy hand and the ROPL covers the size of a typical hand, satisfying the size need of regular hand rehabilitation. In order to evaluate the performance when it works as a haptic device in active mode, the equivalent moment of inertia (MOI) of the device is calculated. The results prove that the device has low inertia which is critical in order to obtain good backdrivability. Experimental analysis shows that the influence of friction accounts for a large portion of the driving torque and warrants future investigation.

关键词： Joints Fingers Exoskeletons Indexes Friction Thumb Electronics packaging

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Analysis on increasing transparency for penalty-based six degree-of-freedom haptic rendering

Analysis on increasing transparency for penalty-based six de...

引用

World Haptics Conference

作者： Zhixiang Wang Dangxiao Wang Yuru Zhang Ming C. Lin State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Department of Computer Science North Carolina State University Chapel Hill USA

virtual coupling is commonly used to maintain stability of penalty-based haptic rendering. However, due to dozens of design parameters involved in the dynamics and force model, to increase transparency while maintaining stability using virtual coupling remains a challenge for 6-Degree-of-Freedom (DOF) haptic rendering. Using an equivalent-angle analysis, we transform 3-DOF rotation into 1-DOF rotation, thereby transforming the 6-DOF dynamics into six 1-DOF dynamics. For each 1-DOF dynamics, a damped vibration model is proposed to analyze the computation of the `graphic tool'. The equilibrium position/angle is defined to analyze the convergence of numerical integration. With this approach, we can improve the transparency of 6-DOF haptic rendering in both free space and constraint space by experimentally determining only two parameters: the integration time step and the number of integrations in each simulation loop. Using this method, we can improve the coupling stiffness to fully exploit the display capability of the haptic device and maintain the stability of the haptic rendering.

关键词： Haptic interfaces Couplings Mathematical model Rendering (computer graphics) Vibrations Dynamics

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一种基于弱标签的三维模型语义自动标注方法

一种基于弱标签的三维模型语义自动标注方法

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第十二届中国虚拟现实大会

作者： TIAN Feng 田枫 SHENXu-kun 沈旭昆 LIU Xian-mei 刘贤梅 ZHOU Kai 周凯 DU Rui-shan 杜睿山 The State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 1001 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 东北石油大学计算机与信息技术学院大庆 163318 The State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 1001 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 School of Computer and Information Technology Northeast Petroleum University Daqing 163318 China 东北石油大学计算机与信息技术学院大庆 163318

随着三维应用的普及,三维模型大量产生并广泛传播。由于三维模型广泛应用于计算机辅助设计、三维游戏、电影特效制作等诸多领域,已经形成了大量的三维模型数据库。三维模型语义标注的目的是给出描述其语义的标注词,是三维模型管理和基... 详细信息

随着三维应用的普及,三维模型大量产生并广泛传播。由于三维模型广泛应用于计算机辅助设计、三维游戏、电影特效制作等诸多领域,已经形成了大量的三维模型数据库。三维模型语义标注的目的是给出描述其语义的标注词,是三维模型管理和基于文本的三维检索的关键技术。针对互联网大量存在的弱标签三维模型现状,提出一种基于弱标签的三维模型语义标注方法LPMLL,首先,采用半监督学习方法进行标签传播,得到标注词置信度,达到提升训练集的目的。然后,采用一种基于最大后验概率准则的方法进行多标签学习,得到最终标注词。实验数据表明了该方法的有效性。

关键词：信息处理三维模型语义标注技术弱标签文本检索

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Interval-valued matrix factorization with applications

Interval-valued matrix factorization with applications

引用

10th IEEE International Conference on Data Mining, ICDM 2010

作者： Shen, Zhiyong Du, Liang Shen, Xukun Shen, Yidong Hewlett Packard Labs China State Key Laboratory of Computer Science China State Key Laboratory of Virtual Reality Technology and system China

ISBN: (纸本)9780769542560

In this paper, we propose the Interval-valued Matrix Factorization (IMF) framework. Matrix Factorization (MF) is a fundamental building block of data mining. MF techniques, such as Nonnegative Matrix Factorization (NMF) and Probabilistic Matrix Factorization (PMF), are widely used in applications of data mining. For example, NMF has shown its advantage in Face Analysis (FA) while PMF has been successfully applied to Collaborative Filtering (CF). In this paper, we analyze the data approximation in FA as well as CF applications and construct interval-valued matrices to capture these approximation phenomenons. We adapt basic NMF and PMF models to the interval-valued matrices and propose Interval-valued NMF (I-NMF) as well as Interval-valued PMF (I-PMF). We conduct extensive experiments to show that proposed I-NMF and I-PMF significantly outperform their single-valued counterparts in FA and CF applications. © 2010 IEEE.

关键词： Matrix factorization

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Using GPU to accelerate a pin-based multi-level cache simulator 10

Using GPU to accelerate a pin-based multi-level cache simula...

引用

Proceedings of the 2010 Spring Simulation Multiconference

作者： Han, Wan Gao, Xiaopeng Long, Xiang Chen, Xianqin State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781450300698

Trace-driven simulation methodology is the most widely used method to evaluate the design of future computer memory architecture. Since this methodology demands large amounts of storage and computer time, there is a growing need for simulation methodologies to determine the memory system requirements of emerging workloads in a reasonable amount of time. Several techniques have been proposed to reduce the space that store memory reference and improve the performance of sequential trace-driven simulation. This paper presents the use of binary instrumentation as the memory reference generator and parallel simulation technique that based on the generic graphics processing unit (GPU). One way to achieve fast parallel simulation is to simulate the independent sets of a cache concurrently on different compute resource, but results show that this method is not efficient because of a high correlation of the activity between different sets. To put parallelism to effective use, we show that a multi-configuration simulation in single pass method gains 2.44x performance improvement compared to traditional sequential algorithm. © 2010 SCS.

关键词： Graphics processing unit

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Accelerate Smoothed Particle Hydrodynamics using GPU

Accelerate Smoothed Particle Hydrodynamics using GPU

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2010 IEEE Youth Conference on Information, Computing and Telecommunications, YC-ICT 2010

作者： Gao, Xiaopeng Wang, Zhiqiang Wan, Han Long, Xiang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University 100191 Beijing China

ISBN: (纸本)9781424488841

Physic-based fluid simulation is used extensively nowadays;however the traditional serial algorithm can't satisfy the realtime requirement due to its complexity and compute-intensive. The development of modern GPU makes this possible. In this paper, a Smoothed Particle Hydrodynamics (SPH) method for incompressible fluid was implemented using CUDA on GPU. Since the algorithm was executed on the GPU entirely, the method can take full advantage of massive computational power of modern graphics hardware. The experiment results show that our GPU based SPH implementation can achieve the rate of 89 frames per second in the simulation of 102K particles and gain nearly 140x speedups compared with the serial algorithm. © 2010 IEEE.

关键词： Graphics processing unit

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Constructing digital museum grid for science popularization exhibition

Constructing digital museum grid for science popularization ...

引用

International Conference on Audio, Language and Image Processing

作者： Liu, Yi-Li Chen, Xiao-Wu Zhou, Bin Luo, Xi-Xi State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424458653

The exhibition of China Science and technology Museum needs to exhibit the specimens of the digital museums and demonstrate the grid technology in a vivid way which meets the requirements from visualization, interaction and multimedia. This paper designs a method of constructing digital museum grid for the purpose of science popularization, based on the existing work of China Education and Research Grid. The method presented here is composed of three steps. Firstly, the human-computer interface and interaction for the science popularization exhibition is designed. Then a way of sharing digital specimen resources is given. Finally, we establish the digital museum grid system for science popularization in the grid environment. The status shows that the exhibition is working very well in China Science and technology Museum, and has received recognition from users. ©2010 IEEE.

关键词： Exhibitions

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Integration of 3D registration methods based on multiple natural features

Integration of 3D registration methods based on multiple nat...

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International Conference on Audio, Language and Image Processing

作者： Chen, Meng-Meng Chen, Xiao-Wu Liu, Yi-Li State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424458653

Current markerless 3D registration methods usually utilize a single specified category of natural features. However, the richness of various natural features is ignored. They cannot meet users' diversified registration requirements. This article proposes an integration strategy of 3D registration methods based on multiple natural features. Utilizing feature detection and tracking and 3D registration algorithms, taking feature points, rectangle features, natural markers and hand features as four typical natural features, we design a description method of multiple natural features state space. With user interaction, the 3D registration is completed through detecting and tracking corresponding natural features. Experiments demonstrate the applicability and accuracy of the proposed integration strategy of 3D registration methods. ©2010 IEEE.

关键词： Integration

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Simplification for texture mapping models with mesh segmentation

Simplification for texture mapping models with mesh segmenta...

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2010 16th International Conference on virtual Systems and Multimedia, VSMM 2010

作者： Wang, Lili Ma, Zhiqiang Xue, Bing Shen, Zhe State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9781424490264

To reduce the loss of visual details in simplification for textured meshes, this paper presents a simplification method based on mesh segmentation. Firstly, the model is partitioned into some sub-meshes according to their properties of appearance, such as texture, normal, etc. Thus, the correlation between sub-meshes can be decreased. Then, we calculate the error metric for the edge collapse in each sub-mesh. Lastly, we merge the simplified sub-meshes and fix the gap among them to regain an integrated mesh. Because the properties of appearance are used to separate the high-frequency details from low-frequency ones, our approach decreases the loss of the detailed. Therefore, we can not only keep the over whole contours of the model, but also maintain better geometric and appearance details. The results of experiments demonstrate our mesh segmentation based method is effective. ©2010 IEEE.

关键词： Mesh generation

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