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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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Displacement residual based DDM matching algorithm

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Science China(Information Sciences) 2012年第9期55卷 2090-2101页

作者： ZHANG Lin 1,2,ZHOU Zhong 1,2,LIU Lin 1,2 & WU Wei 1,2 1 State key laboratory of virtual Reality technology and Systems,Beihang University,Beijing 100191,China 2 School of computer Science and Engineering,Beihang University,Beijing 100191,China 1. State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China2. School of Computer Science and Engineering Beihang University Beijing 100191 China

High level architecture(HLA) is the prevailing standard for modeling and *** data distribution management(DDM) service of HLA is defined for reducing the delivery of irrelevant *** key in DDM implementation is the region overlap computation,*** matching between update and subscription *** algorithms usually make a compromise between region fidelity and network *** paper takes both the matching algorithm efficiency and bandwidth cost into *** main contributions are:1) illustrating the relationship between region changes and overlap changes,as helps reduce the number of region matching and then improves the total matching efficiency;2) classifying region updates into two types of data expression,snapshot and *** network traffic will be reduced by transmitting only residual data instead of full region representations ***,a region matching algorithm called displacement residual-based DDM matching(DRBM) is proposed in the *** analysis,algorithm implementation and experiment evaluation are *** results show that DRBM provides better matching performance and significant network payload reductions especially when there is a large number of changing regions.

关键词： distributed simulation high level architecture data distribution management region snapshot region residual

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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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SEMANTICALLY-GUIDED DISENTANGLED REPRESENTATION FOR ROBUST GAIT RECOGNITION

SEMANTICALLY-GUIDED DISENTANGLED REPRESENTATION FOR ROBUST G...

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2021 IEEE International Conference on Multimedia and Expo, ICME 2021

作者： Chai, Tianrui Mei, Xinyu Li, Annan Wang, Yunhong State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing100191 China

ISBN: (纸本)9781665438643

Gait is an important biometric that can recognize people at a distance. Recently, Disentangled Representation Learning (DRL) has been introduced for distinguishing identity-irrelevant covariate features from identity features for better recognition performance. However, such a simple gait energy image (GEI) pairing operation inevitably brings in over-disentanglement effects that degrade the performance. To address this issue, we proposed a covariate feature control gate module that compensates for the discriminative feature loss by using additional semantic labels. Furthermore, a shared attention module, which allows the identity and covariate part to pay attention to different spatial regions, is also proposed for better spatial disentanglement. Experimental results show that our method outperforms the state-of-the-art and well-explain the mechanism of how the improvement is achieved. The code is available at https://***/ctrasd/GA-ICDNet. © 2021 IEEE

关键词： Semantics

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Beyond pixel: Context defines everything in saliency 15

Beyond pixel: Context defines everything in saliency

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7th International Conference on Internet Multimedia Computing and Service, ICIMCS 2015

作者： Li, Jia State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing100191 China

ISBN: (纸本)9781450335287

This paper will discuss the problem of visual saliency es-timation from the perspective of saliency context. Exist-ing saliency models, which may have remarkable differences in saliency mechanisms and computational frameworks, dif-fer mainly in two aspects: which kinds of saliency contexts are adopted and how to assess saliency based on the select-ed contexts. In other words, context defines everything in saliency. By analyzing recent trends in selecting saliency context, we find that the usage of adaptive context could be a feasible direction toward better saliency models, which we will explore in our feature research efforts. © 2015 ACM.

关键词： Visualization

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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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Pricing Policy for a Dynamic Spectrum Allocation Scheme with Batch Requests and Impatient Packets in Cognitive Radio Networks

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Journal of Systems Science and Systems Engineering 2022年第2期31卷 133-149页

作者： Haixing Wu Shunfu Jin Wuyi Yue School of Information Science and Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Yanshan UniversityQinhuangdao 066004China Department of Intelligence and Informatics Konan UniversityKobe 658-8501Japan

In cognitive radio networks(CRNs),multiple secondary users may send out requests simultaneously and one secondary user may send out multiple requests at one time,i.e.,request arrivals usually show an aggregate ***,a secondary user packet waiting in the buffer may leave the system due to impatience before it is transmitted,and this impatient behavior inevitably has an impact on the system *** to investigate the influence of the aggregate behavior of requests and the likelihood of impatience on a dynamic spectrum allocation scheme in CRNs,in this paper a batch arrival queueing model with possible reneging and potential transmission interruption is *** constructing a Markov chain and presenting a transition rate matrix,the steady-state distribution of the queueing model along with a dynamic spectrum allocation scheme is derived to analyze the stochastic behavior of the ***,some important performance measures such as the loss rate,the balk rate and the average delay of secondary user packets are ***,system experiments are carried out to show the change trends of the performance measures with respect to batch arrival rates of secondary user packets for different impatience parameters,different batch sizes of secondary user packets,and different arrival rates of primary user ***,a pricing policy for secondary users is presented and the dynamic spectrum allocation scheme is socially optimized.

关键词： Cognitive radio networks dynamic spectrum scheme batch arrival impatient packets Markov chain social optimization

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Designing planar cubic B-spline curves with monotonic curvature for curve interpolation

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Computational Visual Media 2020年第3期6卷 349-354页

作者： Aizeng Wang Chuan He Fei Hou Zhanchuan Cai Gang Zhao School of Mechanical Engineering&Automation Beihang UniversityBeijing 100191China State Key Laboratory of Virtual Reality Technology&Systems Beihang UniversityBeijing 100191China State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Faculty of Information Technology Macao University of Science and TechnologyMacao 999078China

Monotonic curvature plays an important role in industrial design and styling of curves with aesthetic shapes,e.g.,in automobile and aircraft design[1].Used in conventional parametric CAD/CAM systems,general B-splines are not adequate for aesthetic *** for the straight line and circle,monotonic curvature distribution,associated with pleasing shape,is very difficult to achieve.

关键词： curvature monotonic curves

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A DCT-domain multi-channel CM-JND model in YCbCr space 2

A DCT-domain multi-channel CM-JND model in YCbCr space

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2nd IEEE International Conference on computer and Communications, ICCC 2016

作者： Gang, Wang Yongfei, Zhang Fan, Rui Zhou, Mingliang Jinhui, Yang Beijing Key Laboratory of Digital Media School of Computer Science and Engineering Beihang University China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467390262

The just noticeable distortion(JND) model has the better feature that can represent the human visual system's characteristics. To improve the accuracy of the JND model in multi-channel space, this paper proposes a DCT-domain multi-channel JND model in the YCbCr space. Firstly, the proposed JND model can directly compute the JND thresholds in the YCbCr space to be applied effectively in the video coding standards using the YCbCr format. Secondly, four effects are jointly considered by the proposed JND thresholds in chroma channels for the first time. Finally, in two chroma channels, we measure the contrast masking effect by psychophysical tests with the 8×8 DCT block size to accurately estimate the HVS thresholds in DCT domain. In tests, we also find out that, as the texture complexity is invariant, the contrast masking effects of the chroma components show a low pass property in frequency, which differs from the luma component that has a bypass property in frequency. Based on this observation, we model a continuous function of DCT frequency, the texture complexity, and the contrast masking effect in Cb and Cr channels, respectively. Experimental results show that the proposed multi-channel JND yields more tolerance for distortions with similar perceptual quality, compared to the Luo's JND model in the YCbCr space. © 2016 IEEE.

关键词： Video signal processing

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Typical curve with G1 constraints for curve completion

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 283-294页

作者： Chuan He Gang Zhao Aizeng Wang Fei Hou Zhanchuan Cai Shaolin Li School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China State Key Laboratory of Computer Science Institute of SoftwareUniversity of Chinese Academy of SciencesBeijing 100049China Faculty of Information Technology Macao University of Science and TechnologyMacao 999078China

This paper presents a novel algorithm for planar G1 interpolation using typical curves with monotonic *** G1 interpolation problem is converted into a system of nonlinear equations and sufficient conditions are provided to check whether there is a *** proposed algorithm was applied to a curve completion *** main advantages of the proposed method are its simple construction,compatibility with NURBS,and monotonic curvature.

关键词： Typical curves Monotonic curvature G1 interpolation Curve completion Euler spiral

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