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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...

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 New Method of Extracting Cloth Wrinkle Baselines

A New Method of Extracting Cloth Wrinkle Baselines

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Japan-China Joint Workshop on Frontier of Computer Science and technology (FCST)

作者： Mi Jing Bing He Yue Lv State Key Lab of Virtual Reality Technology and Systems Beihang University Haidian District Beijing City China

ISBN: (纸本)9781467392969

In this paper, a new method of extracting wrinkle baselines is achieved. First, obtains the deformation vector field in accordance with the deformation analysis on initial mesh and deformed mesh and stretch the cloth mesh to two-dimensional plane. Then, track and extract the sideline in two-dimensional triangular mesh as initial baselines and smooth it to forms the wrinkle curves. Finally, obtain the three-dimensional coordinate of vertex in the wrinkle curves and integrate the wrinkle curves into the wrinkle area. The experimental results show that the technique achieves a good effect of extracting wrinkle baselines and can be applied to cloth mesh models.

关键词： Smoothing methods Laplace equations Solid modeling Tensile stress Shape Joining processes Deformable models

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Deco: False data detection and correction framework for participatory sensing 23

Deco: False data detection and correction framework for part...

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23rd IEEE International Symposium on Quality of Service, IWQoS 2015

作者： Cheng, Long Kong, Linghe Luo, Chengwen Niu, Jianwei Gu, Yu He, Wenbo Das, Sajal State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing100191 China State Key Lab of Networking and Switching Tech Beijing Univ. of Posts and Telecomm Beijing China McGill University Canada National University of Singapore Singapore Singapore IBM Research Austin United States Missouri University of Science and Technology United States

ISBN: (纸本)9781467371131

Participatory sensing enables to collect a vast amount of data from the crowd by allowing a wide variety of sources to contribute data. However, the openness of participatory sensing exposes the system to malicious and erroneous participations, inevitably resulting in poor data quality. This brings forth the important issues of false data detection and correction in participatory sensing. Furthermore, data collected by participants normally include considerable missing values, which poses challenges for accurate false data detection. In this work, we propose DECO, a general framework to detect false values for participatory sensing in the presence of missing data. By applying a tailored spatio-temporal compressive sensing technique, D E CO is able to accurately detect the false data and estimate both false and missing values for data correction. We validate our design through an experimental case study. © 2015 IEEE.

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An Improved Iterative Solution to the PnP Problem

An Improved Iterative Solution to the PnP Problem

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2013中国虚拟现实大会暨ICVRV'2013

作者： Jingyi Gao Yalin Zhang State Key Lab. of Virtual Reality Technology and Systems Beihang University BeijingChina Chinese Aeronautical Radio Electronics Research Institute Shanghai China

The PnP (perspective-n-point) problem is very important in pose estimation technique based on computer *** at this issue,an improved iterative solution is *** the means of expressing the 3D point coordinates as a weighted sum of four control points,a system of homogeneous linear equations was established and then the optimized projections on the normalized image plane were *** final estimation result was achieved by a relaxation-based iterative *** simulations and experiments certify that the proposed algorithm can improve the computing accuracy and depress the image *** with other solutions to the PnP problem,the proposed algorithm can reduce the computational complexity while maintaining high precision with noise depression capability.

关键词： pose estimation perspective-n-point problem iterative solution

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Thermaltex: A two-modal tactile display for delivering surface texture and thermal information 12th

Thermaltex: A two-modal tactile display for delivering surfa...

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12th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications, EuroHaptics 2020

作者： Guo, X. Zhang, Y. Wei, W. Xu, W. Wang, D. State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing100083 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing100083 China Department of Mechanical Engineering The University of Auckland Auckland1142 New Zealand

ISBN: (纸本)9783030581466

We present a two-modal surface display that can simultaneously display thermal and texture stimuli to the user’s fingers. The texture is generated by electrovibration effect on a flexible film with a high thermal conductivity. The temperature of the film is controlled by Peltier element attached with a water-cooling heatsink. The performance of the prototyped device is evaluated by the temperature response to the step signal and the maximum electrostatic force of the display. The application of the display is demonstrated in a virtual reality environment where users can feel the two modal haptic property of the virtual object. © The Author(s) 2020.

关键词： Display devices

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BakedAvatar: Baking Neural Fields for Real-Time Head Avatar Synthesis

arXiv

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arXiv 2023年

作者： Duan, Hao-Bin Wang, Miao Shi, Jin-Chuan Chen, Xu-Chuan Cao, Yan-Pei State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Zhongguancun Laboratory Beijing100191 China ARC Lab Tencent PCG Beijing China

Synthesizing photorealistic 4D human head avatars from videos is essential for VR/AR, telepresence, and video game applications. Although existing Neural Radiance Fields (NeRF)-based methods achieve high-fidelity results, the computational expense limits their use in real-time applications. To overcome this limitation, we introduce BakedAvatar, a novel representation for real-time neural head avatar synthesis, deployable in a standard polygon rasterization pipeline. Our approach extracts deformable multi-layer meshes from learned isosurfaces of the head and computes expression-, pose-, and view-dependent appearances that can be baked into static textures for efficient rasterization. We thus propose a three-stage pipeline for neural head avatar synthesis, which includes learning continuous deformation, manifold, and radiance fields, extracting layered meshes and textures, and fine-tuning texture details with differential rasterization. Experimental results demonstrate that our representation generates synthesis results of comparable quality to other state-of-the-art methods while significantly reducing the inference time required. We further showcase various head avatar synthesis results from monocular videos, including view synthesis, face reenactment, expression editing, and pose editing, all at interactive frame rates on commodity devices. Source codes and demos are availab.e on our project page. © 2023, CC BY.

关键词： Textures

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Multi-attributes controlled point-based rendering architecture for mobile devices

Multi-attributes controlled point-based rendering architectu...

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11th IEEE International Conference on Computer-Aided Design and Computer Graphics(第11届IEEE国际计算机辅助设计与图形学学术会议 IEEE CAD/GRAPHICS 2009)

作者： Zhiying He Xiaohui Liang State Key Lab. of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang UniversityBeijing 100191 P.R. China

Taking the characteristics of mobile devices and the demands for graphics rendering into account, this paper gives a set of definitions of attributes to express the performance of mobile terminals and algorithm performance. And then, according to the relationship of these attributes, a point-based rendering architecture for mobile devices is proposed. It includes pre-processing simplification, data organization and rendering. Instead of just simplifying the algorithm on PC, the entire process takes the multi-attributes of mobile devices and algorithm into account. Experiments shows that it can make full use of the limited resources to carry out a relatively realistic and real-time rendering.

关键词： Rendering (computer graphics) Mobile computing Testing Graphics Cranes Control systems Computer architecture Helium virtual reality Computer science

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Haptic Rendering of Tissue Boundary for Surgical Training

Haptic Rendering of Tissue Boundary for Surgical Training

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2008 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, Pages 949-1423

作者： Renge Zhou Dangxiao Wang Yuru Zhang State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing P. R. China

ISBN: (纸本)9781424424948

Haptic rendering of complex scenes is becoming more and more important with the development of the virtual reality in surgical simulation. This paper studies the haptic rendering of the boundaries between tissues with different physical properties which is one of the common problems in complex scene simulation. Three indexes, boundary perceptibility, boundary force stability and plane height stability, are proposed to evaluate the fidelity of haptic boundary rendering. We have introduced two haptic rendering methods on the boundary, gray area method and virtual interface method to simulate two types of force feelings which are categorized into foggy boundary and clear boundary. And three experiments including haptic rendering for foggy boundary, sensing shape of boundary and tooth section simulation, have been done to prove the validity of the methods on the haptic rendering of boundary.

关键词： haptic rendering different physical properties boundary recognition dental simulation haptic recognition

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Speed-accuracy tradeoff of controlling absolute magnitude of fingertip force

Speed-accuracy tradeoff of controlling absolute magnitude of...

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World Haptics Conference

作者： Teng Li Dangxiao Wang Shusheng Zhang Yuru Zhang Chun Yu State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China Tsinghua Univesity Beijing China

Controlling absolute magnitudes of fingertip force is an important skill in many haptic interactions such as surgical operations and mechanical assemblies. A fundamental question in the force control is how quickly human can output a target force with expected accuracy. In this paper, human's capability to control absolute magnitudes of fingertip force under audio or visual feedback was observed through experiments. Twelve participants applied a target force by pressing a force sensor with their fingers and maintained the force within a specified tolerance for a specific period of time (500ms). The magnitudes of target force and tolerance were manipulated systematically to yield varied levels of task difficulty. The experimental data showed that the applied fingertip force obeyed Fitts' law under both visual and auditory feedback modes when the index of difficulty (ID) was smaller than a threshold. The results may be used as guidelines for the applications that rely on accurate and quick changing force control over a target region such as multiple tapping tasks.

关键词： Force Visualization Force control Time factors Fingers Accuracy Force sensors

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Fast Local Stereo Matching with Effective Matching Cost and Robust Cost Aggregation

Fast Local Stereo Matching with Effective Matching Cost and ...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Zhengrong Zhu Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China School of Automation Science and Electrical Engineering Beihang University Beijing China

Stereo matching is extensively investigated in computer vision. This article is dedicated to local stereo matching based on adaptive support region for higher accuracy and speed. Firstly, we propose a novel cross-based and diamond-shaped sparse census transform with improved robustness and fastness compared with traditional methods. Secondly, an efficient computation of cost volume is proposed to accommodate diverse images. Once again, we improve the establishment of adaptive support region and ameliorate exponential step cost aggregation at the same time. At last, we achieve final disparity map by winner take all and disparity refinement. Experiments on Middlebury benchmark demonstrate our algorithm's better performance compared with other local methods.

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