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2010 International Conference on Educational and Network technology, ICENT 2010

作者： Ai, Mingjing Jiang, Qixing State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781424476619

The error concealment(EC) method for video transmission over wireless network recommended by H.264 cannot reconstruct the corrupted image effectively, which was caused partly by the inaccurate predicted motion vector(MV).Thus a temporal error concealment(TEC) method based on weighted motion vectors of double candidate blocks in the previous frame is proposed in this paper. The proposed method conceals a corrupted block by the MV given by weighting motion vectors of double candidate blocks according to their different accuracy. Moreover, to improve the accuracy of a candidate block and it's MV when searching a matched block in the reference frame, the reliability of the neighboring blocks of the current corrupted block was assigned by different reliability coefficients in terms of their different contribution to recover the corrupted block. The performances, on several standard video sequences, of the proposed TEC method have been compared with those obtained by the EC method in H.264. Experimental results show that the proposed method outperforms the method in H.264 both on PSNR and visual quality obviously. © 2010 IEEE.

关键词： Wireless networks

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3D modeling and augmented reality

3D modeling and augmented reality

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2010 4th International Universal Communication Symposium, IUCS 2010

作者： Yue, Qi State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781424478200

In this talk, I will first introduce our research on 3D modeling. For 3D geometry modeling, we present a rapid method to align large sets of 3D scanned data automatically. We articulate a novel approach to geometric model completion via interactive sketches. For appearance modeling, we present a new method for modeling real-world surface reflectance, described with non-parametric spatially-varying bidirectional reflectance distribution functions (SVBRDF). Then I will show our Augmented reality Aided Jet Engine Assembly and Disassembly Guidance System. In this system, context-aware text instructions, video clips and virtual assembly/disassembly demonstrations are displayed on demand as an overlay in head-mounted displays (HMD);hands-free voice interfaces are used for user interaction;operations are synchronized wirelessly among different technicians and controlled with a dedicated work flow server. ©2010 IEEE.

关键词： Augmented reality

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Adaptive SIFT matching using cascading vocabulary tree

Adaptive SIFT matching using cascading vocabulary tree

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2011 International Conference on virtual reality and Visualization, ICVRV 2011

作者： ZhiQiang, Fan XuKun, Shen State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769546025

We present a novel vocabulary tree data structure for adaptive SIFT matching. Our matching process contains an offline module to cluster features from a group of reference images and an online module to match them to the live images in order to enhance matching robustness. The main contribution lies in constructing two different vocabulary structures cascaded in one tree, which we have called cascading vocabulary tree that can be used to not only cluster features but also implement exact feature matching as k-d tree does. Cascading key frame selection using our vocabulary structure can be put the matching process forward, which gives us a way to employ a cascading feature matching strategy to combine matching results of cascading vocabulary tree and key frame. Experimental results show that our method not only dramatically enhances matching robustness but also has enough flexibility to adaptively adjust itself to meet diverse requirements of domain applications for efficiency and robustness of SIFT matching. © 2011 IEEE.

关键词： Trees (mathematics)

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Eye-shaped keyboard for dual-hand text entry in virtual reality

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virtual reality & Intelligent Hardware 2023年第5期5卷 451-469页

作者： Kangyu WANG Yangqiu YAN Hao ZHANG Xiaolong LIU Lili WANG State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100083China Peng Cheng Laboratory Shenzhen 518000China

We propose an eye-shaped keyboard for high-speed text entry in virtual reality (VR), having the shape of dual eyes with characters arranged along the curved eyelids, which ensures low density and short spacing of the keys. The eye-shaped keyboard references the QWERTY key sequence, allowing the users to benefit from their experience using the QWERTY keyboard. The user interacts with an eye-shaped keyboard using rays controlled with both the hands. A character can be entered in one step by moving the rays from the inner eye regions to regions of the characters. A high-speed auto-complete system was designed for the eye-shaped keyboard. We conducted a pilot study to determine the optimal parameters, and a user study to compare our eye-shaped keyboard with the QWERTY and circular keyboards. For beginners, the eye-shaped keyboard performed significantly more efficiently and accurately with less task load and hand movement than the circular keyboard. Compared with the QWERTY keyboard, the eye-shaped keyboard is more accurate and significantly reduces hand translation while maintaining similar efficiency. Finally, to evaluate the potential of eye-shaped keyboards, we conducted another user study. In this study, the participants were asked to type continuously for three days using the proposed eye-shaped keyboard, with two sessions per day. In each session, participants were asked to type for 20min, and then their typing performance was tested. The eye-shaped keyboard was proven to be efficient and promising, with an average speed of 19.89 words per minute (WPM) and mean uncorrected error rate of 1.939%. The maximum speed reached 24.97 WPM after six sessions and continued to increase.

关键词： virtual reality Human computer interaction Text entry Shaped keyboard QWERTY-like key sequence Dual-hand cooperation

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Bionics analysis of equipment self-healing

Bionics analysis of equipment self-healing

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International Conference on Reliability, Maintainability and Safety

作者： Ding, Yan Kang, Le Wang, Meihui Lv, Chuan State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781612846644

Applying the theory of Bionics, this article explores the meaning of equipment self-healing deeply by contrasting the sub-health condition of human being, and analyzes the self-healing mechanism of equipment through investigating the theory of human self-recovery. According with integrative design methods, this article proposes a new method to develop the primary equipment and the self-healing system synchronously. This paper provides the foundation of developing self-healing technology in different fields. © 2011 IEEE.

关键词： Bionics

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Motion data retrieval from very large motion databases

Motion data retrieval from very large motion databases

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2011 International Conference on virtual reality and Visualization, ICVRV 2011

作者： Ren, Cheng Lei, Xiaoyong Zhang, Guofeng State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769546025

The reuse of motion capture data has become an important way to generate realistic motions. Retrieval of similar motion segments from large motion datasets accordingly serves as a fundamental problem for data-based motion processing methods. The retrieval task is difficult due to the spatio-temporal variances existing in human motion. With the increasing amount of data, the retrieval task has become even more time consuming. In this paper, we present a motion retrieval approach that is capable of extracting similar motion subsequences from very large motion databases given a query motion input. Our method employs BIRCH-based(Balanced Iterative Reducing and Clustering using Hierarchies) clustering method to incrementally cluster poses so as to effectively deal with very large datasets. An elastic LCS(longest common subsequence) algorithm is then proposed to discover the similar motion subsequences based on the posture clustering result. Finally, the motion patterns are extracted and stored, with each pattern containing a set of similar motions. In the runtime retrieval stage, as each stored pattern effectively compared with the query motion, the group of the similar motions is acquired. Experimental results show that our method successfully retrieves similar motions and outperforms the existing methods in time and space costs when applying to very large motion datasets. © 2011 IEEE.

关键词： Iterative methods

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Integrating boundary cue with superpixel for image segmentation

Integrating boundary cue with superpixel for image segmentat...

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International Conference on Image and Graphics

作者： Sun, Linjia Liang, Xiaohui State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769545417

This paper researches image segmentation as a global optimization problem and proposes a new way, which is called superpixel status model, to integrate boundary and region cue. Superpixel status model is a label model which describes the joint distribution of boundary and region classification in a bayesian framework. For organizing a boundary classifier, the contour of superpixel is decomposed into multiple line segments, and a robust line descriptor is presented to form line feature vector. Finally, an objective function is defined to assemble all superpixels statuses across the entire image for segmentation. Experiments and results show that the effectiveness of our approach. © 2011 IEEE.

关键词： Global optimization

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Further results on consensus for coupled swarm systems 18

Further results on consensus for coupled swarm systems

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18th IEEE Conference on Industrial Electronics and Applications, ICIEA 2023

作者： Wang, Shaojie Xiao, Jin Hu, Xiaoguang Beihang University State Key Laboratory of Virtual Reality Technology and Systems Beijing China

ISBN: (纸本)9798350312201

The motion of the swarm system can be composed of the absolute motion of the swarm as a whole and the relative motion between nodes. Especially for nonlinear swarm systems, their absolute motion remains unknown. This paper considers a synchronization model for continuous-time swarm systems, which can be viewed as a generalized version of the consensus model for multi-agent systems, where node dynamics can be linear or nonlinear, and the coupling function of the state between nodes can also be linear or nonlinear. This paper is dedicated to answer what the specific form of the synchronization function (i.e., the absolute motion of the synchronized swarm system) is, and how to determine the contribution rate of the nodes in the network to the synchronization function. We leverage the state decomposition method to determine the synchronization function. Specifically, the paper illustrates the relationship between the synchronization function and the solution of the isolated node. © 2023 IEEE.

关键词： Synchronization

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Haptic rendering of virtual hand with force smoothing

Haptic rendering of virtual hand with force smoothing

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2011 International Conference on virtual reality and Visualization, ICVRV 2011

作者： Feng, Miao Li, Jiting Zheng, Ruoyin State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769546025

In this paper, we present methods to generate a stable and realistic force rendering between virtual hand and object for a hand rehabilitation system. There are multi-contact regions between hand and object. For each contact region, the virtual contact force is modeled upon the spring-mass model. As direct rendering with spring-mass model in a large stiffness will induce instability of the haptic device, we apply a force-smoothing method by limiting the maximum force variation to guarantee the stability in the haptic rendering. The system experiment results demonstrate that the proposed method can provide satisfactory stable haptic display. And the maximum virtual stiffness that the system can simulate increases from 0.7 N/mm to 1.6N/mm by using force smoothing process. © 2011 IEEE.

关键词： virtual reality

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Research on Electrical System Modeling of Aerostat Based on Harmony-SE 18

Research on Electrical System Modeling of Aerostat Based on ...

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18th IEEE Conference on Industrial Electronics and Applications, ICIEA 2023

作者： Pan, Xiang Xiao, Jin Hu, Xiaoguang Beihang University State Key Laboratory of Virtual Reality Technology and Systems Beijing China

ISBN: (纸本)9798350312201

In order to solve the problems of low efficiency of traditional model-based methods in the design and modeling of the electrical system of aerostat. Aiming at the design and modeling problems of aerostat electrical system, which is a typical multidisciplinary complex system, this paper firstly proposes a design method based on functional flow, state flow and information flow on the basis of the Harmony-SE method. The information flow is regarded as the element connecting between states and functions, and the requirements, structure and behavior model of the electrical system of aerostat is constructed. Then we put forward the method of building a structural model around the information flow and mapping the structural model to the integration of FMU model. We realized the physical modeling and model integration of part of the electrical system of aerostat, and finally completed the design and modeling of four parts of the electrical system of aerostat from requirements, functions, logic and physics. This method can improve the efficiency of multidisciplinary complex system design and modeling by optimizing the context use case repeated analysis and function design redundancy when the traditional model-based method is applied to multidisciplinary complex system design. © 2023 IEEE.

关键词： Efficiency

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