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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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3D shape co-segmentation via sparse and low rank representations

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Science China(Information Sciences) 2018年第5期61卷 285-287页

作者： Liyuan YIN Kan GUO Bin ZHOU qinping zhao State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang University

As a traditional and fundamental research area in computer graphics,3D shape segmentation has provided large support to many other 3D processing technologies.3D shape co-segmentation,which together with model sets,co-segments multiple 3D shape parts among the same category,has been attracting significant attention to fully utilize the common features of model sets.

关键词： NSE shape co-segmentation via sparse and low rank representations PSB

Haptics-equiped interactive PCI simulation for patient-specific surgery training and rehearsing

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Science China(Information Sciences) 2016年第10期59卷 233-238页

作者： Shuai LI Qing XIA Aimin HAO Hong QIN qinping zhao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Department of Computer Science Stony Brook University

Despite the long history of medical simulations, suffering from the patient-specific heterogeneous heart physiological structure and complex intravascular procedures, it is still challenging for patient-specific percutaneous coronary intervention(PCI) surgery simulation. In this paper, we advocate a haptics-equiped interactive prototype system towards PCI surgeons training and patient-specific surgery rehearsing, which can afford trainees the opportunity to approximately experience the entire PCI procedures and customized emergency cases that might occur in common clinical settings. The full simulation covers tissue deformation, catheter and wire simulation, X-ray simulation, haptic feedback, and 3D realistic rendering, which in all give rise to the integrated physical, visual, haptic, and procedural realism. Our system can accommodate various comprehensive operations involved in PCI-related procedures, including feeding wires, releasing stents, injecting contrast medium, simulating X-ray, bleeding, etc. Moreover, our system framework is fully built upon CUDA, and thus can achieve real-time performance even on a common desktop. The high-fidelity, real-time efficiency and stableness of our system show great potentials for its practical applications in clinical training fields.

关键词： percutaneous coronary intervention(PCI) PCI surgery simulation patient-specific surgery rehearsing physically-based modeling haptics

氯代水杨胺杀灭光滑双脐螺和藁杆双脐螺效果研究

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中国热带医学 2024年第3期24卷 239-243页

作者：涂珍赵琴平李博单晓伟张聪孙凌聪元艺湖北省疾病预防控制中心湖北武汉430079 武汉大学基础医学院湖北武汉430071

目的观察新型灭螺剂10%氯代水杨胺制剂(chlorosalicylicamide,LDS)对曼氏血吸虫(Schistosoma mansoni)中间宿主光滑双脐螺(Biomphalaria glabrata)和藁杆双脐螺(Biomphalaria straminea)的作用效果,为该灭螺剂的现场应用提供实验基础。方法将10%LDS配制成有效浓度分别为0.4000、0.2000、0.1000、0.0500、0.0250、0.0125 mg/L的系列标准溶液,在实验室浸泡光滑双脐螺和藁杆双脐螺,观察在不同浓度溶液中浸杀上述2种双脐螺24、48、72 h后螺的死亡情况,统计各组死亡率并计算半数致死浓度(LC_(50))和相对毒力指数,同时设立50%氯硝柳胺乙醇胺盐(50%wet‐table power of niclosamide ethanolamine salt,WPN)为药物对照组,并设立空白对照组(去氯水)。结果LDS有效浓度在0.1000 mg/L及以上时,WPN有效浓度在0.2000 mg/L及以上时光滑双脐螺和藁杆双脐螺浸泡24、48、72 h后死亡率均能达到100%。光滑双脐螺浸泡在LDS系列浓度溶液中,24、48、72 h LC_(50)分别为0.04795、0.04652、0.03710 mg/L;光滑双脐螺浸泡在WPN系列浓度溶液中,24、48、72 h LC_(50)分别为0.06348、0.05705、0.05705 mg/L。藁杆双脐螺浸泡在LDS系列浓度溶液中,24、48、72 h LC_(50)分别为0.01235、0.01399、0.00840 mg/L;藁杆双脐螺浸泡在WPN系列浓度溶液中,24、48、72 h LC_(50)分别为0.05895、0.02571、0.02375 mg/L。以LC_(50)值较大的WPN为标准药物,其相对毒力指数为1.00,LDS对光滑双脐螺浸杀24、48、72 h后的相对毒力指数分别为1.32、1.23、1.54;LDS对藁杆双脐螺浸杀24、48、72 h后的相对毒力指数分别为4.77、1.84、2.83。使用LDS浸杀上述2种双脐螺24、48、72 h后,光滑双脐螺存活数均高于藁杆双脐螺,差异有统计学意义(χ^(2)=8.044、5.263、4.658,P<0.05)。结论相较于传统灭螺药物WPN,10%LDS对光滑双脐螺和藁杆双脐螺杀灭效果更佳,尤其对藁杆双脐螺作用效果更为敏感,具有替代作用。

关键词：光滑双脐螺藁杆双脐螺灭螺剂曼氏血吸虫氯代水杨胺

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Semantic part segmentation of single-view point cloud

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Science China(Information Sciences) 2020年第12期63卷 251-253页

作者： Haotian PENG Bin ZHOU Liyuan YIN Kan GUO qinping zhao State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang University

As a classic topic in computer graphics, the semantic part segmentation of 3D data is helpful for3D part-level editing and modeling. Single-views point cloud is the raw format of 3D data. Giving each point a semantic annotation in single-view point cloud, i.e., single-view point cloud semantic part segmentation, is meaningful and challenging.

关键词： computers and graphics single-view point cloud annotation transfer semantic part segmentation category independent matching point clouds registration

Personalized cardiovascular intervention simulation system

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Virtual Reality & Intelligent Hardware 2020年第2期2卷 104-118页

作者： Aimin HAO Jiahao CUI Shuai LI qinping zhao State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100083China Beihang University Qingdao Research Institute Beihang UniversityQingdao 266000China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100083China

Background This study proposes a series of geometry and physics modeling methods for personalized cardiovascular intervention procedures,which can be applied to a virtual endovascular *** Based on personalized clinical computed tomography angiography(CTA)data,mesh models of the cardiovascular system were constructed *** coupling 4 D magnetic resonance imaging(MRI)sequences corresponding to a complete cardiac cycle with related physics models,a hybrid kinetic model of the cardiovascular system was built to drive kinematics and dynamics *** that basis,the surgical procedures related to intervention instruments were simulated using specially-designed physics *** models can be solved in real-time;therefore,the complex interactions between blood vessels and instruments can be well ***,X-ray imaging simulation algorithms and realistic rendering algorithms for virtual intervention scenes are also *** particular,instrument tracking hardware with haptic feedback was developed to serve as the interaction interface of real instruments and the virtual intervention ***,a personalized cardiovascular intervention simulation system was developed by integrating the techniques mentioned *** This system supported instant modeling and simulation of personalized clinical data and significantly improved the visual and haptic immersions of vascular intervention *** It can be used in teaching basic cardiology and effectively satisfying the demands of intervention training,personalized intervention planning,and rehearsing.

关键词： Personalized cardiovascular modeling Intervention simulation system Intervention instrument simulation X-ray imaging simulation Hybrid model

Fast and compact dynamic data compression based on composite rigid body construction

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Science China(Information Sciences) 2014年第11期57卷 66-84页

作者： MA ZhiQiang WANG LiLi ZHANG BoNing KE Wei zhao qinping State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang University Macao Polytechnic Institute

3D dynamic datasets compression still poses two challenges. One is high time cost due to growing data and complex computation of compression algorithms. The other is low compression factor because of complex motions of dynamic scenes and unknown motion equations. In this paper, composite rigid body construction for fast and compact compression of 3D dynamic datasets is proposed to solve these two problems. It accelerates the compression with a fast rigid body decomposition based on disjoint union, and avoids serial searching, comparing and merging of the rigid body decomposition. To increase the compression factor,composite rigid body is introduced with consideration of motion consistency among rigid bodies at different time periods. The results of the experiments show that our algorithm compresses dynamic datasets quickly and achieves a high compression factor.

关键词： time-varying datasets dynamic datasets compression rigid body decomposition disjoint union composite rigid body construction

Structure guided texture inpainting through multi-scale patches and global optimization for image completion

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Science China(Information Sciences) 2014年第1期57卷 25-40页

作者： CHEN XiaoWu ZHOU Bin GUO Yu XU Fang zhao qinping State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University

Automatic image completion can provide convenient editing of consumer *** image completion methods find the best patch locally and then copy it to the hole region for texture *** the best patch is fixed in size,it is hard to adapt these methods efciently either to various patterns or to content ***,salient image structures can be estimated and propagated to guide the texture inpainting process for more plausible *** paper presents a novel image completion method using structure guided texture *** do not require any interactions to achieve automatic two-stage image *** the structure completion stage,the salient structures around the hole region are detected,and then the missing structure curves are completed with Euler *** textures along the structure curves are completed through belief *** the texture inpainting stage,we propose multi-scale patches and global optimization to inpaint the remaining texture in the hole regions guided by the completed ***,with defined patch sizes,the hole region is divided into lattice patches,making it possible for multiple patch sizes to render multiscale descriptions of this image.A multi-scale graph is then built for the hole region and formulated as a posterior probability ***,using a simulated annealing based Markov chain Monte Carlo method,an inference algorithm is designed to find a global optimization solution for the posterior probability *** experiments show that our method can automatically complete the hole region and preserve plausible structure shapes of existing ones in various *** texture inpainting results are more convincing with guidance from the completed structures,and our method can guarantee and accelerate convergence of the global optimization.

关键词： image completion texture inpainting structure propagation global optimization

Self-adjustable hyper-graphs for video pose estimation based on spatial-temporal subspace construction

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Science China(Information Sciences) 2022年第3期65卷 260-262页

作者： Jizhou MA Shuai LI Hong QIN Aimin HAO qinping zhao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Department of Computer Science Stony Brook University

Dear editor,In recent years many supervised video pose estimation methods have achieved growing successes based on well-labeled training datasets. Nonetheless, when facing roughly-labeled training data, it still remains challenging to intrinsically encode the video contents’ spatial-temporal coherency for robust video pose *** researches aimed to directly improve and refine the existing confidence maps by combining the spatial-temporal structure models [1, 2]. Li et al.

关键词： Video Pose Estimation Self-adjustable Hyper-graph Spatial-temporal Subspace Exploration Maximum Matching Subspace Operator Action Pattern