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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zongye Zhang Huanyu Zhou Qingjie Liu Yunhong Wang State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Skeleton-based human action recognition has received widespread attention for its robustness to changes in the background and appearance of actors compared to the RGB modality. Data augmentation is widely used to explicitly regularize the model to prevent overfitting, especially when the number of labeled samples is scarce. However, compared to various augmentation methods available for the RGB modality, there are fewer works on the skeleton modality, especially a model-agnostic augmentation method that can be easily integrated into multiple models. We address the problem by proposing a comprehensive data augmentation framework named SkeletonMix, which contains a pair sample selection module for mixup and random augmentations tailored for skeleton modality. SkeletonMix is a non-learning framework and can be applied to different models in a plug-and-play manner. Extensive experiments on NTU RGB+D, NTU RGB+D 120 and PKU-MMD datasets demonstrate the effectiveness of our proposed framework under limited labeled training data. Our proposed method boosts the performance by a maximum of 7.5% on scarce training data setup (5% of training data).

关键词： Training data Speech recognition Signal processing Data augmentation Skeleton Robustness Data models Human activity recognition Speech processing Overfitting

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Effects of visual rotation axis and clockwise/counterclockwise directions on circular vection in virtual reality 24

Effects of visual rotation axis and clockwise/counterclockwi...

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2024 International Conference on virtual reality, Image and Signal Processing, ICVISP 2024

作者： Xu, Xiaotian Song, Zhe Zhang, Kexin Xu, Yan Zhang, Yuankun Fan, Xiaoya Pu, Fang Key Laboratory of Human Motion Analysis and Rehabilitation Technology of the Ministry of Civil Affairs Beihang University Beijing China Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province Dalian University of Technology Liaoning Dalian China State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (纸本)9798400710926

Vection, an illusion of self-motion induced by visual stimulus frequently experienced in virtual reality, significantly impacts user experiences in gaming, driving simulation, and rehabilitation training. User often experience circular vection, an illusion of self-rotation. However, the effects of visual rotation axes and rotation directions on circular vection remain elusive. We employ a 3 (rotation axis: sagittal, coronal, vertical) × 2 (rotation direction: clockwise, counterclockwise) repeated-measures design. Twenty participants were recruited. They were exposed to a virtual visual rotating drum at 60 °/s to induce circular vection. The real-time estimation of perceived self-motion rotation velocity (PSRV) was obtained. Results indicated that during the 30-second constant rotation, the group-level PSRV showed an initial rapid increase followed by a slower rise. A significant interaction effect between rotation axis and direction was revealed. The rotation direction showed no significant effect on PSRV under sagittal and vertical conditions. However, under coronal condition, the PSRV was significantly higher when rotating counterclockwise, compared to rotation clockwise. In addition, when rotating counterclockwise, the highest PSRV appeared under sagittal condition, with the lowest under the coronal condition and the middle under the vertical condition. These findings provide valuable insights for designing VR scenarios with better user experience by vection manipulation. © 2024 Copyright held by the owner/author(s).

关键词： virtual reality

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The Conquest of the Atlantic

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IEEE INDUSTRIAL ELECTRONICS MAGAZINE 2014年第1期8卷 53-+页

作者： Guarnieri, Massimo State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

We are all used to the possibilities made available by the Internet and information and communications technology (ICT), but only those of us who are at least in our 40s can truly appreciate the difference between the present day and the time when rapid long-distance bidirectional communication could only take place via telegraph, telephone, and telex. A similar revolution occurred in the late 1830s with the invention of the telegraph, the first electric technology to gain wide success. However, this pioneering equipment performed badly; with the conductivity of commercial copper around 40% lower than its present value and insulating material unreliable, it was a common practice to lay bare overhead lines hanging on wooden poles with glass or porcelain insulators.

关键词： porcelain insulators Telegraphies Inventions Information and communication technology bidirection communication insulating material Wood poles Internets conductivity Overhead lines Atlantic Ocean

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Edge-Preserving Depth Map Super-Resolution with Intensity Guidance

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Journal of Beijing Institute of technology 2019年第1期28卷 51-56页

作者： Xiaochuan Wang Xiaohui Liang State Key Laboratory of Virtual Reality Technology and System Beihang University

Depth discontinuity edge affects the visual quality of synthesized images in 3D image ***,it suffers from accuracy degradation when up-sampled from low-resolution depth maps,especially at large scaling *** preserve the accuracy of depth discontinuity,a novel joint bilateral depth super-resolution with intensity guidance method is ***,the fast local intensity classification is exploited to estimate depth coefficients in joint bilateral up-sampling for depth maps,so as to eliminate depth discontinuity edge ***,the proposed method is accelerated on graphic processing units(GPUs)to meet the requirement of realtime *** demonstrate that our method can preserve the accuracy of depth discontinuity edges after super resolution,leveraging the visual quality of synthesized image in 3D image warping.

关键词： super resolution depth map joint bilateral filter 3D image warping synthesized image

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Stable haptic interaction using a damping model to implement a realistic tooth-cutting simulation for dental training

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virtual reality 2008年第2期12卷 99-106页

作者： Liu, Guanyang Zhang, Yuru Wang, Dangxiao Townsend, William T. State Key Lab of Virtual Reality Technology and System Beihang University Beijing China Barrett Technology Inc.

It is difficult to implement a stable and realistic haptic simulation for cutting rigid objects that is based on a damping model because of an inevitable conflict between stability and high output force. This paper presents passivity techniques to show that an excessive damping coefficient causes the output stiffness to exceed the maximum output stiffness of the haptic device, leading to instability. By analysing the damping model of a haptic dental-training simulator, we construct a relationship among the damping coefficient, position resolution, sampling frequency, human operation, and the maximum achievable device stiffness that will still maintain device stability. A method is also provided to restrict the output stiffness of the haptic device to ensure stability while enabling the realistic haptic simulation of cutting rigid objects (teeth) that is based in a damping model. Our analysis and conclusions are verified by a damping model that is constructed for a dental-training haptic display. Three types of haptic devices are used in our analysis and experiments. © Springer-Verlag London Limited 2008.

关键词： Haptic interfaces

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The Data-Reusing MCC-Based Algorithm and Its Performance Analysis

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Chinese Journal of Electronics 2016年第4期25卷 719-725页

作者： LIU Chunhui QI Yue DING Wenrui Research Institute of Unmanned Aerial Vehicle Beihang University State Key Laboratory of Virtual Reality Technology and System Beihang University

Maximum correntropy criterion(MCC)provides a robust optimality criterion for non-Gaussian signal *** this paper,the weight update equation of the conventional MCC-based adaptive filtering algorithm is modified by reusing the past K input vectors,forming a class of data-reusing MCC-based algorithm,called DRMCC *** with the conventional MCCbased algorithm,the DR-MCC algorithm provides a much better convergence performance when the input data is *** mean-square stability bound of the DRMCC algorithm has been studied *** both Gaussian noise case and non-Gaussian noise case,the expressions for the steady-state Excess mean square error(EMSE) of DR-MCC algorithm have been *** relationship between the data-reusing order and the steadystate EMSEs is also *** results are in agreement with the theoretical analysis.

关键词： Adaptive filtering Maximum correntropy criterion(MCC) Data-reusing Mean-square stability Steady-state excess mean square error

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Light Space Cascaded Shadow Maps Algorithm for Real Time Rendering

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Journal of Computer Science & technology 2011年第1期26卷 176-186页

作者：梁晓辉马上岑丽霞于卓 State Key Lab.of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang University

Owing to its generality and efficiency, Cascaded Shadow Maps （CSMs） has an important role in real-time shadow rendering in large scale and complex virtual environments. However, CSMs suffers from redundant rendering problem -- objects are rendered undesirably to different shadow map textures when view direction and light direction are not perpendicular. In this paper, we present a light space cascaded shadow maps algorithm. The algorithm splits a scene into non-intersecting layers in light space, and generates one shadow map for each layer through irregular frustum clipping and scene organization, ensuring that any shadow sample point never appears in multiple shadow maps. A succinct shadow determination method is given to choose the optimal shadow map when rendering scenes. We also combine the algorithm with stable cascaded shadow maps and soft shadow algorithm to avoid shadow flicking and produce soft shadows. The results show that the algorithm effectively improves the efficiency and shadow quality of CSMs by avoiding redundant rendering, and can produce high-quality shadow rendering in large scale dynamic environments with real-time performance.

关键词： shadow mapping light space redundant rendering large scale dynamic environments

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A survey on virtual reality

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Science in China(Series F) 2009年第3期52卷 348-400页

作者： ZHAO QinPing State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing 100083 China

virtual reality （VR） is a scientific method and technology created during the exploration of the nature by human beings to understand, simulate, and better adapt and use the nature. Based on the analysis on the whole process of VR, this paper presents different categories of VR problems and a type of theoretical expression, and abstracts three kinds of scientific and technical problems in VR field. On the basis of foresaid content, this paper also studies current major research objectives, research results and development trend of VR in the aspects of VR modeling method, VR representation technology, human-machine interaction and devices, VR development suites and supporting infrastructure, as well as VR applications. Finally, several theoretical and technical problems that need to be further studied and solved are addressed.

关键词： virtual reality modeling rendering human-machine interaction development suite

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GPU-BASED FLUID SIMULATION WITH FAST COLLISION DETECTION ON BOUNDARIES

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International Journal of Modeling, Simulation, and Scientific Computing 2012年第1期3卷 137-148页

作者： JIAWEN WU FENGQUAN ZHANG XUKUN SHEN State Key Laboratory of Virtual Reality Technology and System Beihang University 100191 BeijingChina

In this paper,we present a method for fluid simulation based on smoothed particle hydrodynamic(SPH)with fast collision detection on boundaries on *** major goal of our algorithm is to get a fast SPH simulation and rendering on ***,our algorithm has the following three features:At first,to make the SPH method GPU-friendly,we introduce a spatial hash method for neighbor *** sorting the particles based on their grid index,neighbor search can be done quickly on ***,we propose a fast particle-boundary collision detection *** precomputing the distance field of scene boundaries,collision detection’s computing cost arrived as O(n),which is much faster than the traditional ***,we propose a pipeline with fine-detail surface reconstruction,and progressive photon mapping working on *** experiment our algorithm on different situations and particle numbers of scenes,and find out that our method gets good *** experimental data shows that we can simulate 100K particles,and up to 1000K particles scene at a rate of approximately 2 times per second.

关键词： SPH simulation fast collision detection GPU progressive photon mapping

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Haptic-visual interaction training system for refueling aircraft

Haptic-visual interaction training system for refueling airc...

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2009 2nd International Conference on Biomedical Engineering and Informatics, BMEI 2009

作者： Liu, Guanyang Zhou, Wanlin Muli, Liu Wang, Ju State Key Lab of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (纸本)9781424441341

The goal of this paper is to develop haptic-visual interaction training system for aircraft fuel supply simulation. Operators can use this system to simulate refueling aircraft in virtual environment with tactile and visual feedback. The simulator is built based on haptic device Omega 3DOF. Hardware and software are discussed to meet the requirement of training simulation. Experiment results show that the system can provide stable simulation of aircraft refueling operation. ©2009 IEEE.

关键词： virtual reality

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