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IEEE International Conference on Computer-Aided Design and Computer Graphics

作者： Huijuan Zhang Chong Li Leilei Gao Guoping Wang Graphics and Interaction Lab Peking University Beijing China Peking University Beijing Beijing CN Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University Beijing China Cooperative Medianet Innovation Center Beijing China

In this paper we introduce a hierarchical region decomposition algorithm for triangle meshes segmentation based on quadric surface fitting. Initially, the whole mesh represents a single cluster. At every iteration, the region with largest error is divided and Lloyd iteration clustering is executed following, which make sure the segmentation has the minimum error in each hierarchical level. An error control strategy is used to get finally result automatically. Besides, users also can interpose this process by specifying the segmentation level. Each segmentation region after this process has a best fitting proxy of quadric surface. We propose an improved L 2,1 distance into a hybrid error, which is used in least square fit of quadric function. By comparing with the state-of-the art methods, our method is testified to be insensitive to noise. Model optimization and hole filling based on our algorithm are demonstrated in the last.

关键词： Solid modeling Clustering algorithms Surface treatment Design automation Surface fitting Computational modeling Measurement

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A sparse representation based joint demosaicing method for single-chip polarized color sensor

arXiv

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arXiv 2019年

作者： Wen, Sijia Zheng, Yinqiang Lu, Feng The State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing100191 China The Next Generation Artificial Intelligence Research Center The University of Tokyo Tokyo113-8656 Japan

The emergence of the single-chip polarized color sensor now allows for simultaneously capturing chromatic and polarimetric information of the scene on a monochromatic image plane. However, unlike the usual camera with an embedded demosaicing method, the latest polarized color camera is not delivered with an in-built demosaicing tool. For demosaicing, the users have to down-sample the captured images or to use traditional interpolation techniques. Neither of them can perform well since the polarization and color are interdependent. Therefore, joint chromatic and polarimetric demosaicing is the key to obtaining high-quality polarized color images. In this paper, we propose a joint chromatic and polarimetric demosaicing model to address this challenging problem. Instead of mechanically demosaicing for the multi-channel polarized color image, we further present a sparse representation-based optimization strategy that utilizes chromatic information and polarimetric information to jointly optimize the model. To avoid the interaction between color and polarization during demosaicing, we separately construct the corresponding dictionaries. We also build an optical data acquisition system to collect a dataset, which contains various sources of polarization, such as illumination, reflectance and birefringence. Results of both qualitative and quantitative experiments have shown that our method is capable of faithfully recovering full RGB information of four polarization angles for each pixel from a single mosaic input image. Moreover, the proposed method can perform well not only on the synthetic data but the real captured data. Copyright © 2019, The Authors. All rights reserved.

关键词： Global optimization

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Fitted avatars: automatic skeleton adjustment for self-avatars in virtual reality

arXiv

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arXiv 2023年

作者： Ponton, Jose Luis Ceballos, Víctor Acosta, Lesly Ríos, Alejandro Monclús, Eva Pelechano, Nuria Research Center for Visualization Virtual Reality and Graphics Interaction - ViRVIG Universitat Politècnica de Catalunya Barcelona Spain Visual Computing Center - VCC King Abdullah University of Science and Technology Thuwal Saudi Arabia Estadística i Investigació Operativa - EIO Universitat Politècnica de Catalunya Barcelona Spain

In the era of the metaverse, self-avatars are gaining popularity, as they can enhance presence and provide embodiment when a user is immersed in virtual reality. They are also very important in collaborative virtual reality to improve communication through gestures. Whether we are using a complex motion capture solution or a few trackers with inverse kinematics (IK), it is essential to have a good match in size between the avatar and the user, as otherwise mismatches in self-avatar posture could be noticeable for the user. To achieve such a correct match in dimensions, a manual process is often required, with the need for a second person to take measurements of body limbs and introduce them into the system. This process can be time-consuming, and prone to errors. In this paper, we propose an automatic measuring method that simply requires the user to do a small set of exercises while wearing a Head-Mounted Display (HMD), two hand controllers, and three trackers. Our work provides an affordable and quick method to automatically extract user measurements and adjust the virtual humanoid skeleton to the exact dimensions. Our results show that our method can reduce the misalignment produced by the IK system when compared to other solutions that simply apply a uniform scaling to an avatar based on the height of the HMD, and make assumptions about the locations of joints with respect to the trackers. © 2023, CC BY.

关键词： Inverse kinematics

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Behavior analysis through collaborative visual exploration on trajectory data

Behavior analysis through collaborative visual exploration o...

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IEEE Symposium on Visual Analytics Science and technology (VAST)

作者： Tangzhi Ye Youfeng Hao Zhenhuang Wang Chufan Lai Siming Chen Zongru Li Jie Liang Xiaoru Yuan Key Laboratory of Machine Perception (Ministry of Education) Peking University Key Laboratory of Machine Perception (Ministry of Education) and School of EECS Peking University China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University

In VAST Challenge 2015, we proposed a collaborative visual exploration system for behavior analysis over trajectory records. We discuss technical details in this report, in order to deliberate how the system supports multiple users to collaboratively analyze the same data, assist in sharing their findings, and constructing an overall picture of their insights.

关键词： Trajectory Collaboration Data visualization Visual analytics Logic gates Electronic mail

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Clustering and merging for real-time forest rendering

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Computer Aided Drafting,Design and Manufacturing 2016年第1期26卷 1-6页

作者： Ouyang Taoxu Lai Shunnan Li Sheng Peking University Shenzhen Graduate School Shenzhen 518055China School of EECS Peking UniversityBeijing 100871China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization(Peking University) Beijing 100871China. Peking University Information Technology Institute(Tianjin Binhai) Tianjin 300452China.

Rendering of large-scale forest scenes is a challenging task, whose highly geometric complexity will put heavy burden on current graphics hardware. When navigating the scene, the overall visual result is generally considered as the core concern. A new method is proposed in this paper for large-scale forest rendering using clustering and merging strategies. Our method improves the rendering effect by clustering polygons according to the point information with relation to neighbours. A fast forest rendering system is developed accordingly. The relative techniques in the system can improve the visual quality on demand of different applications.

关键词： cluster analysis polygon merging texture merging large-scale rendering

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The automatic height extraction of buildings from shadow region

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Computer Aided Drafting,Design and Manufacturing 2016年第1期26卷 7-14页

作者： Jiang Min Lai Shunnan Li Sheng Peking University Shenzhen Graduate School Shenzhen 518055China School of EECS Peking UniversityBeijing 100871China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China. Peking University Information Technology Institute(Tianjin Binhai) Tianjin 300452China.

Height extraction for buildings is a fundamental step of 3D scene reconstruction in many virtual reality applications. In this paper, we propose an automatic method to extract the height of buildings in high resolution satellite imagery based on the length of shadow. Taking into account the limitation of traditional algorithms, we make use of the boundary information of a building to facilitate detecting and matching the shadow regions with higher accuracy. Then, we introduce a shadow-cast model to correct the shadow location in our system. The experimental result shows that when extracting the height of buildings from complex urban regions, our method has better accuracy.

关键词： shadow detection region matching boundary extraction height inference

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IEEE Transactions on Haptics: Editorial

引用

IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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Human lunar base:“Lunar Palace 1”team of Beihang University unveils China’s“Lunar Palace”plan

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The Innovation 2024年第2期5卷 3-4页

作者： Hui Liu Zhikai Yao Hong Liu Institute of Environmental Biology and Life Support Technology School of Biological Science and Medical EngineeringBeihang UniversityBeijing 100083China Internet Joint Research Center of Aerospace Biotechnology&Medical Engineering Beihang UniversityBeijing 100083China State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijing 100083China

Recently,the“Lunar Palace 1”team of Beihang University,China,in response to the long-term habitation and healthcare of humans on the Moon,released the“Lunar Palace”plan through the official account“Beihang University”on WeChat’s video *** the development of crewed deep-space exploration,human permanent residence on the Moon is no longer an unattainable dream but an anticipated *** on the Moon will live in a Lunar Palace equipped with a bioregenerative life support system(BLSS),creating an Earth-like environment,much like the Lunar Palace 1 facility on Earth.

关键词： Earth Human equipped

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Three-dimensional visualization of microstructures

Three-dimensional visualization of microstructures

引用

IEEE Conference on visualization

作者： M. Lanzagorta M.V. Kral J.E. Swan G. Spanos R. Rosenberg E. Kuo Scientific Visualization Laboratory contractor from Scientific and Engineering Solutions Naval Research Laboratory Inc. Washington D.C. DC USA Virtual Reality Laboratory Naval Research Laboratory Inc. Washington D.C. DC USA Materials Science and Technology Division Naval Research Laboratory Inc. Washington D.C. DC USA Scientific Visualization Laboratory Naval Research Laboratory Inc. Washington D.C. DC USA

This case study describes a technique for the three-dimensional analysis of the internal microscopic structure (microstructure) of materials. This technique consists of incrementally polishing through a thin layer (approximately 0.2 /spl mu/m) of material, chemically etching the polished surface, applying reference marks, and performing optical or scanning electron microscopy on selected areas. The series of images are then processed employing AVS and other visualization software to obtain a 3D reconstruction of the material. We describe how we applied this technique to an alloy steel to study the morphology, connectivity, and distribution of cementite precipitates formed during thermal processing. The results showed microstructural features not previously identified with traditional 2D techniques.

关键词： visualization Microstructure Optical materials Optical microscopy Chemicals Etching Surface morphology Surface reconstruction Electron optics Scanning electron microscopy

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Survey of virtual human techniques

引用

Jisuanji Gongcheng/Computer engineering 2005年第18期31卷 7-9页

作者： Luo, Guan Hao, Chongyang Zhang, Wen Fan, Yangyu Institute of Electronic and Information Engineering Northwestern Polytechnical University Xi'an 710072 China Xi'an Research Center of Virtual Reality Engineering Technology Xi'an 710072 China

With the in-depth development of virtual reality technology and the increasing requirement for it, virtual human techniques in the virtual environment have attracted more and more attention, gradually forming a new hot research field. A comprehensive survey of study and development of virtual human is given in two aspects: geometry representation and motion generation and control. Finally, the framework of a new skeleton modeling method is put forward based on multi-rigid-body system theory.

关键词： Geometry representation Motion capture Motion generation and control Multi-rigid-body system virtual human

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