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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Jianghu Lu Di Huang Yunhong Wang Longteng Kong State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing 100191 China

ISBN: (纸本)9781479999897

This paper proposes a novel approach to athlete tracking in sports videos. It follows the framework of Compressive Tracking (CT), but extends it by two manners, i.e. scale refinement as well as occlusion recovery. For the former, an objectness method, namely Edge Box (EB) is adopted to generate proposals, replacing the fixed sampling box in CT, which better fits the scales of the candidate objects. For the latter, a candidate obstruction based solution is presented, which makes use of additional trackers to detect possible obstructions especially the ones possessing highly similar appearances as the target one, and relocate the target as occlusion ends. Therefore, the proposed method inherits the advantage of CT in robust object modelling and fast processing speed, and embodies the tolerance to occlusion and scaling. We evaluate the proposed method on a collection of videos of beach volleyball games, and the experimental results and the comparison with recent advanced trackers highlight its effectiveness.

关键词： Object tracking Occlusion Scaling Sports Video Analysis

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Verbally Assisting virtual-Environment Tactile Maps: A cross-linguistic and cross-cultural study

Advances in Intelligent Systems and Computing

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Advances in Intelligent systems and Computing 2014年 215卷 821-831页

作者： Lohmann, Kris Yu, Junlei Kerzel, Matthias Wang, Dangxiao Habel, Christopher Department of Informatics University of Hamburg Hamburg Germany State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

The Verbally Assisting virtual-Environment Tactile Maps (VAVETaM) approach proposes to increase the effectiveness of tactile maps by realizing an intelligent multi-modal tactile map system that generates assisting utterances that generates assisting utterances acquiring survey knowledge from virtual tactile maps. Two experiments in German conducted with blindfolded sighted people and with blind and visually impaired people show that both types of participants benefit from verbal assistance. In this paper, we report an experiment testing the adaptation of the German prototype to be useable by Chinese native speakers. This study shows that the VAVETaM system can be adapted to Chinese language with comparable small effort. The Chinese participants' achievement in acquiring survey knowledge is comparable to those of the participants in the German study. This supports the view that human processing of representationally multi-modal information is comparable between different cultures and languages. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Mergers and acquisitions

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A Multi-metric QoS Routing Method for Ad Hoc Network

A Multi-metric QoS Routing Method for Ad Hoc Network

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Jing Cao Wei Wu State Key Lab of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing China

A multimetric QoS routing protocol (MQOLSR) is proposed in this paper, which providing different QoS for different applications flow in an ad hoc network. The protocol, which integrates QoS measurement and packet forwarding, expands the topology discovery and routing computing mechanism of the OLSR protocol. It can provide different routing and forwarding service according to different application flow. The experimental results show that the MQOLSR protocol improves the network performance. Compared to the traditional OLSR protocol, the proposed routing protocol increases network throughput by 31.8% and reduces delay jitter when transmitting IPTV, while its routing overhead and routing discovery time are within an acceptable range.

关键词： Ad hoc networks Bandwidth Routing protocols Jitter Network topology Computer networks virtual reality Computer science Delay effects Access protocols

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VibroArm: Enhancing the Sensation of Forearm Deformation in virtual reality Using Vibrotactile Funneling Illusion

VibroArm: Enhancing the Sensation of Forearm Deformation in ...

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International Symposium on Mixed and Augmented reality (ISMAR)

作者： Yilong Lin Tianze Xie Yingjie Chang Hu Luo Dangxiao Wang Seungwoo Je School of Design Southern University of Science and Technology State Key Lab of Virtual Reality Technology and Systems Beihang university

ISBN: (数字)9798331516475

ISBN: (纸本)9798331516482

When we enter virtual reality (VR) in the first person, the avatar replaces our real body. Within a certain range of mismatches, we tend to identify with our avatar and perceive it as our own body. Previous research has shown that we can even believe that a deformed forearm is our own through haptic and visual feedback. However, the haptic devices used in earlier research were only explored using skin-stretching and weight-shifting. Vibrotactile feedback is the most common technique used to create a haptic VR experience in academia and industry because of its light weight and ease of application. Taking these advantages, we introduce VibroArm, a lightweight wearable haptic system with the vibrotactile funneling illusion that enhances the virtual forearm’s ownership in the forearm deformation illusion. In a perceptual study, we determined that users can make correct direction judgments about vibration on the forearm in different directions. The result shows that all vibration patterns can be sufficiently recognized, with an average recognition rate of $87.17 \%$. Based on our results, we designed 18 vibration patterns and compared their impact on the forearm deformation illusion. Finally, our study shows that using VibroArm in VR applications can significantly improve user realism and enjoyment compared to relying on visual feedback alone.

关键词： Vibrations Industries Visualization Deformation Avatars Haptic interfaces Pattern recognition Trajectory Augmented reality

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Rendering and Modeling of Stratus Cloud Using Weather Forecast Data

Rendering and Modeling of Stratus Cloud Using Weather Foreca...

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International Conference on virtual reality and Visualization (ICVRV)

作者： Xiangxin Xu Chunqiang Yuan Xiaohui Liang Xukun Shen State Key Lab. of Virtual Reality Technol. & Syst. Beihang University Beijing CN State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376747

This paper presents a method for physically plausible modeling and real-time rendering of large scale cloud scene from weather forecast data which includes stratus clouds and cumulus clouds. Our method uses particles as primitives, but differs from existing methods, the particles are generated from the data using a new optical model, and then are splatted onto multi-resolution axis-aligned slices for rendering at interactive frame rates. In the cloud optics model, multiple light sources are used and multiple anisotropic Mie scattering and Rayleigh scattering are employed according to the particle optical depth. After particles are generated from weather forecast data, multi-resolution axis-aligned slices are generated. The rendering process can use these slices and be easily implemented on graphics hardware. The experiment results show that realistic cloud can be modeled and rendered at interactive frame rates.

关键词： Clouds Rendering (computer graphics) Data models Meteorology Predictive models Sun Cloud computing

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Dynamic ocean inverse modeling based on differentiable rendering

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Computational Visual Media 2024年第2期10卷 279-294页

作者： Xueguang Xie Yang Gao Fei Hou Aimin Hao Hong Qin State Key Lab of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Qingdao Research Institute Beihang UniversityQingdao 266100Chinaand Peng Cheng LabShenzhen 518000China SKLCS Institute of SoftwareChinese Academy of SciencesBeijing 100190Chinaand University of Chinese Academy of SciencesBeijing 100049China Department of Computer Science Stony Brook University(SUNY at Stony Brook)Stony BrookNew York 11794-2424USA

Learning and inferring underlying motion patterns of captured 2D scenes and then re-creating dynamic evolution consistent with the real-world natural phenomena have high appeal for graphics and *** bridge the technical gap between virtual and real environments,we focus on the inverse modeling and reconstruction of visually consistent and property-verifiable oceans,taking advantage of deep learning and differentiable physics to learn geometry and constitute waves in a self-supervised ***,we infer hierarchical geometry using two networks,which are optimized via the differentiable *** extract wave components from the sequence of inferred geometry through a network equipped with a differentiable ocean ***,ocean dynamics can be evolved using the reconstructed wave *** extensive experiments,we verify that our new method yields satisfactory results for both geometry reconstruction and wave ***,the new framework has the inverse modeling potential to facilitate a host of graphics applications,such as the rapid production of physically accurate scene animation and editing guided by real ocean scenes.

关键词： inverse modeling surface reconstruction wave modeling ocean waves differentiable rendering(DR)

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An interactive animation system for mobile devices

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2011年第2期5卷 133-140页

作者： He, Zhiying Wang, Jian State Key Lab. of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

The limitations of resource on mobile devices make the animation on mobile devices become a challenge. This paper proposes a novel interactive remote animation system for mobile devices. Given a point model, the system can use motion data to drive the model to do animation, and can interactively edit the style of motion. Three modules which are data transmission, style editing, interaction and animation are included in the system. A preprocessing involves skeletonization and learning a generative model is needed for animation and style editing. Experiments show our system has natural interaction of style editing and can better display the model animation driven by the generated stylistic motion data on the mobile terminal.

关键词： Animation

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A novel skeletonization and animation approach for point models

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2012年 7145 LNCS卷 139-150页

作者： He, Zhiying Liang, Xiaohui Zhao, Qinping State Key Lab. of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9783642290497

It is hard to extract skeletons using geometric models with limited information such as point models without topology and models with low resolution. This paper proposes a novel skeleton-extracting and animation approach for point models, which explores the differential properties of point models without triangulating the discrete points. First, this paper gives definitions of the attributes of surface and tangency, and then uses these attributes to iteratively contract the model to get the skeleton. At last the point models animation driven by the resulting skeleton is presented. Results show that our approach can get good skeletons even if the model is lacking connection information and in low resolution. Also, it can obtain good animation results and make the animation more convenient since the binding of skeleton points and skin is obtained. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Animation

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A virtual Forces Based Target Detection Enhancing Approach for Video Sensor Networks

A Virtual Forces Based Target Detection Enhancing Approach f...

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The 11th IEEE International Conference on Communications systems(第11届电子和电气工程师协会国际通信系统会议)(IEEE ICCS 2008)

作者： Zhao-feng Zhang Wei Wu State Key Lab of Virtual Reality Technology and Systems School of Computer Science Beihang University BeijingChina

The region coverage is an important affecting factor of target detection performance in wireless video sensor networks (WVSN). However, the traditional region coverage can not estimate the target detection performance properly, so the concept of Effective Coverage is introduced in this paper, which can be considered as the equivalent of target detection performance. Moreover, we propose an effective coverage-enhancing approach for video sensor networks based on virtual forces and the directional sensing model. This approach provides a unified modeling of both sensor node and special area, and defines different states of sensor nodes, including free and restraint state. On this basis, the state switch mechanism and selfadaptive adjusting algorithm in the corresponding models are presented to achieve the target detection performance enhancing indirectly. Simulation results are also presented to demonstrate the performance of these algorithms.

关键词： WVSN virtual force target detection

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A point models simplification based on energy and screen resolution for mobile devices

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Journal of Information and Computational Science 2009年第5期6卷 1945-1952页

作者： He, Zhiying Liang, Xiaohui Duan, Wei State Key Lab. of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

Mobile devices have two characteristics that clearly different from the conventional PC systems: low resolution and limited energy. Traditional simplification algorithm computes the error in the object space, which is pure geometry simplification. They do not consider the screen resolution of display terminal. In this paper, we present a novel point models simplification based on energy and screen resolution for mobile devices. The approach calculates the error based on the ultimate display effect, which means it could from the visual effect to determine which part should be simplified first. In addition, we consider the trade-off between visual quality and energy consumption. Energy is used to control the simplification level. Finally, we apply the method to a point models simplification which is based on MLS and splat, and then render the result points on mobile devices. © 2009 Binary Information Press.

关键词： Energy utilization

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