检索结果-内蒙古大学图书馆

IEEE International Conference on Image Processing

作者： Chengyu Guo Songsong Ruan Xiaohui Liang State Key Lab. of Virtual Reality Technology and Systems Beihang University

ISBN: (纸本)9781467399623

Appearance model is widely used for image description and demonstrates an impressive performance in object detection. However, most appearance models can not be applied to more freedom object in still image, especially when dealt with variant objects whose shapes are modified by warping, rotation, etc. In this article, a simple but effective method to build a regional rotation-invariant feature descriptor is proposed to catch discriminative information of the variant human pose, which has a superior advantage when targets are in arbitrary orientations and slightly warping. Moreover, a mixture spatial model with visible parameters is then presented to differentiate the body structure and estimate the visible accurate position of each joint. The experiment results indicate that the proposed descriptor give near state-of-the-art performance on both handwritten digit recognition database and two public human motion databases containing athletes or pedestrians under certain different variations.

关键词： Human detection Pose estimation Bilayer appearance model Spatial prior distribution pose estimation Body Freedom STILL Posing image description Human Still images Object detection images Warping Pedestrians Descriptors

来源：评论

学校读者我要写书评

暂无评论

A method of evolving finger vein template

A method of evolving finger vein template

引用

2012 International Symposium on Biometrics and Security Technologies, ISBAST 2012

作者： Tang, Darun Huang, Beining Li, Wenxin Li, Xiaoming School of Electronics Engineering and Computer Science Peking University China State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769546964

In a finger vein verification system, when running for a long time, the captured templates could be different from the registered ones because of the user habits changing, the devices ageing, and some other factors. The unsteady discrepancy between templates of the same finger affects the verification results seriously. Therefore, we design a templates evolution method to get evolving templates, which can reduce the influence of templates changing when matching. Experimental results show that using evolving templates can make the EER of the system reduced from 6.3 to 3.5. © 2012 IEEE.

关键词： Evolution Finger Vein OPM Templates

来源：评论

学校读者我要写书评

暂无评论

Haptics-mediated approaches for enhancing sustained attention: framework and challenges

引用

Science China(Information Sciences) 2019年第11期62卷 5-30页

作者： Dangxiao WANG Teng LI Naqash AFZAL Jicong ZHANG Yuru ZHANG State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Peng Cheng Laboratory School of Medical Sciences University of New South Wales Neuroscience Research Australia School of Biological Science and Medical Engineering Beihang University

Sustained attention is essential in the daily human activities of perception, manipulation, and locomotion. An improvement in sustained attention exhibits potential impacts in several scenarios, including the treatment of mental disorders, such as the attention-deficit/hyperactivity disorder, and the training of certain professionals, such as aircraft pilots, who work under environments with heavy cognitive loads. In this study, we review the haptics-mediated sustained attention-training approaches from the afferent and efferent perspectives based on the bidirectional information flow in the haptic channel. Subsequently, the feasibility of modulating and enhancing attention via the haptic channel is analyzed based on the studies that have investigated the correlation between attention and the afferent/efferent pathways of the haptic *** identify several research questions, including how to design diverse haptic training tasks via the afferent and/or efferent pathways and which adaptive strategies can be used to adjust the difficulty levels of haptic training tasks to ensure user engagement. Furthermore, we examine the behavioral and biological evidence that can be used to validate the training efficacy, the manner in which the neural mechanisms underlying the attention-enhancing process can be understood, and the effective variables that can be attributed to the near-and far-transfer effects. In addition, we discuss the difficulties associated with the development of novel haptic technologies. In this study, we intend to investigate the potential impact of haptic stimuli on neuroplasticity and to promote the study of haptics-mediated sustained attention training.

关键词： sustained attention attention enhancement haptic interaction robotics electroencephalogram virtual reality human-computer interaction

来源：评论

学校读者我要写书评

暂无评论

Interactive high-resolution boundary surfaces for deformable bodies with changing topology

Interactive high-resolution boundary surfaces for deformable...

引用

8th Workshop on virtual reality Interactions and Physical Simulations, VRIPHYS 2011

作者： Wu, Jun Dick, Christian Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany State Key Lab of Virtual Reality Technology and Systems Beihang University China

ISBN: (纸本)9783905673876

Recent work has demonstrated that composite finite-elements provide an effective means for physically based modeling of deformable bodies. In this paper we present a number of highly effective improvements of previous work to allow for a high-performance and high-quality simulation of boundary surfaces of deformable bodies with changing topology, for instance, due to cuts and incisions. Starting at a coarse resolution simulation grid, along a cut we perform an adaptive octree refinement of this grid down to a desired resolution and iteratively pull the fine level finite-element equations to the coarse level. In this way, the fine level dynamics can be approximated with a small number of degrees of freedom at the coarse level. By embedding the hierarchical adaptive composite finite-element scheme into a geometric multigrid solver, and by exploiting the fact that during cutting only a small number of cells are modified in each time step, high update rates can be achieved for high resolution surfaces at very good approximation quality. To construct a high quality surface that is accurately aligned with a cut, we employ the dual-contouring approach on the fine resolution level, and we instantly bind the constructed triangle mesh to the coarse grid via geometric constrains. © The Eurographics Association 2011.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

The evolution of virtual reality therapy

The evolution of virtual reality therapy

引用

Proceedings of the International Conference on Imaging Science, systems and technology, CISST'03

作者： North, Max M. Virtual Reality Technology Lab. Computer Science and Info. Systems Kennesaw State University 1000 Chastain Road Kennesaw GA 30144-5591 United States

virtual reality Therapy (VRT) continues to show a strong presence in mainstream research. It appears to be attracting more scientists, researchers and clinicians to this innovative paradigm. Due to this enthusiastic interest, the author has prepared this paper to shade light on this uncharted field. It is the author hope that more research will be conducted to help the many people who suffer from psychological disorders. This paper briefly attempts to summarize the recent and current active VRT research in various research lab.ratories. It also provides some direction and innovative ideas for the next generation of VRT applications. Readers must note that the author is pointing out the next immediate practical applications of VRT and are by no means limiting the potential of the VRT paradigm.

关键词： virtual reality

来源：评论

学校读者我要写书评

暂无评论

Augmented reality-based visual-haptic modeling for thoracoscopic surgery training systems

引用

virtual reality & Intelligent Hardware 2021年第4期3卷 274-286页

作者： Yonghang TAI Junsheng SHI Junjun PAN Aimin HAO Victor CHANG Yunnan Key Lab Optoelectronic Information Technology Yunnan Normal UniversityKunming 650500China State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China School of Computing Engineering and Digital TechnologiesTeesside UniversityMiddlesbrough TS13BXUK

Background Compared with traditional thoracotomy,video-assisted thoracoscopic surgery(VATS)has less minor trauma,faster recovery,higher patient compliance,but higher requirements for *** surgery training simulation systems are important and have been widely used in Europe and *** reality(AR)in surgical training simulation systems significantly improve the training effect of virtual surgical training,although AR technology is still in its initial *** reality has gained increased attention in technology-driven modern medicine but has yet to be used in everyday *** This study proposed an immersive AR lobectomy within a thoracoscope surgery training system,using visual and haptic modeling to study the potential benefits of this critical *** content included immersive AR visual rendering,based on the cluster-based extended position-based dynamics algorithm of soft tissue physical ***,we designed an AR haptic rendering systems,whose model architecture consisted of multi-touch interaction points,including kinesthetic and pressure-sensitive ***,based on the above theoretical research,we developed an AR interactive VATS surgical training *** Twenty-four volunteers were recruited from the First People's Hospital of Yunnan Province to evaluate the VATS training ***,content,and construct validation methods were used to assess the tactile sense,visual sense,scene authenticity,and simulator *** The results of our construction validation demonstrate that the simulator is useful in improving novice and surgical skills that can be retained after a certain period of *** video-assisted thoracoscopic system based on AR developed in this study is effective and can be used as a training device to assist in the development of thoracoscopic skills for novices.

关键词： Augmented reality VATS Surgery training XPBD

来源：评论

学校读者我要写书评

暂无评论

A classification approach to interpretation of traditional Chinese musical score

A classification approach to interpretation of traditional C...

引用

2012 IEEE International Conference on Information Science and technology, ICIST 2012

作者： Li, Rongfeng Ding, Yelei Li, Wenxin Bi, Minghui Ministry of Education Peking University Beijing 100871 China State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing 100871 China School of Arts Peking University Beijing 100871 China

ISBN: (纸本)9781457703454

Gongchepu, one of the widely-used traditional Chinese musical scores, is hard to read due to the immeasurable rhythmic rule, which only presents a general rhythmic structure while the duration of each note is determined by performer according to the context of the melody. Experience of determining the duration of each note is passed down via oral tradition, and there are few experts who can read such musical score now. However, by capitalizing on classification methods, such as Naïve Bayes and Maximum Entropy Model, rhythms of gongchepu can be lab.led and interpreted into staff automatically, making it much easier to read. A precision of 85.63% is achieved in experiments. As an attempt to solve the rhythmic immeasurability problem in the study of musical score with the application of statistical model, this work is conducive to the preservation of Chinese traditional cultural heritage. © 2012 IEEE.

关键词： Historic preservation

来源：评论

学校读者我要写书评

暂无评论

Analysis on increasing transparency for penalty-based six degree-of-freedom haptic rendering

Analysis on increasing transparency for penalty-based six de...

引用

2011 IEEE World Haptics Conference, WHC 2011

作者： Wang, Zhixiang Wang, Dangxiao Zhang, Yuru Lin, Ming C. State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China Department of Computer Science University of North Carolina Chapel Hill United States

ISBN: (纸本)9781457702976

virtual coupling is commonly used to maintain stability of penalty-based haptic rendering. However, due to dozens of design parameters involved in the dynamics and force model, to increase transparency while maintaining stability using virtual coupling remains a challenge for 6-Degree-of-Freedom (DOF) haptic rendering. Using an equivalent-angle analysis, we transform 3-DOF rotation into 1-DOF rotation, thereby transforming the 6-DOF dynamics into six 1-DOF dynamics. For each 1-DOF dynamics, a damped vibration model is proposed to analyze the computation of the ‘graphic tool’. The equilibrium position/angle is defined to analyze the convergence of numerical integration. With this approach, we can improve the transparency of 6-DOF haptic rendering in both free space and constraint space by experimentally determining only two parameters: the integration time step and the number of integrations in each simulation loop. Using this method, we can improve the coupling stiffness to fully exploit the display capability of the haptic device and maintain the stability of the haptic rendering. © 2011 IEEE.

关键词： Transparency

来源：评论

学校读者我要写书评

暂无评论

Synthesis and Editing of Human Motion with Generative Human Motion Model

Synthesis and Editing of Human Motion with Generative Human ...

引用

International Conference on virtual reality and Visualization

作者： Chengyu Guo Songsong Ruan Xiaohui Liang State Key Lab. Of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376747

In this paper, a generic approach is presented to constructing generative motion model from prerecorded motion data that allows the synthesis of new motions or modification of existing motions in various ways. The key idea is to decompose human motion data into a series of latent variables which decompose a number of sports from different properties, in the way motion variations are interpreted by modeling human motion data in the Gaussian process. The effectiveness and flexibility of this approach in experiments and applications are demonstrated by constructing two generative motion models as an example of various kinds of motion properties.

关键词： character animation generative motion models motion editing and synthesis

来源：评论

学校读者我要写书评

暂无评论

Harmonic Retrieval and Simulation of Aircraft Engine Noise

Harmonic Retrieval and Simulation of Aircraft Engine Noise

引用

International Conference on Computer Research and Development (ICCRD)

作者： Yang Yang Shuling Dai Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

Engine aerodynamic noise is a complex component of flight simulation, consisting of multiple groups of harmonics and broadband noise signals based on passing frequency. Harmonic simulation can effectively convey human auditory perception but lacks related study in flight simulation. To accurately simulate the acoustic behavior of harmonic noise, first, a high-order cumulant based pre-filtering method is applied to retrieve harmonic signals from the real engine noise recordings by exploiting the blindness of the third-order cumulants to the harmonic signal. Then, targeting the lower precision of the autoregressive (AR) coefficients in the pre-filtering calculations, a maximum likelihood method is proposed to estimate the ARMA parameters of the high-order cumulants. The simulation results show that the accuracy of AR parameter estimation is significantly improved compared to the moment estimation method. Finally, the exact frequency is verified and obtained based on first-order cyclic statistics, and then the harmonic signal in the time domain is extracted.

关键词： Time-frequency analysis Maximum likelihood estimation Atmospheric modeling Simulation Aerospace simulation Harmonic analysis Frequency estimation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：