检索结果-内蒙古大学图书馆

Homography-guided stereo matching for wide-baseline image interpolation

Computational Visual Media 2022年第1期8卷 119-133页

作者： Yuan Chang Congyi Zhang Yisong Chen Guoping Wang Peking University Beijing 100871China Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China The University of Hong Kong Hong KongChina

Image interpolation has a wide range of applications such as frame rate-up conversion and free viewpoint *** significant progresses,it remains an open challenge especially for image pairs with large *** this paper,we first propose a novel optimization algorithm for motion estimation,which combines the advantages of both global optimization and a local parametric transformation *** perform optimization over dynamic label sets,which are modified after each iteration using the prior of piecewise consistency to avoid local *** we apply it to an image interpolation framework including occlusion handling and intermediate image *** validate the performance of our algorithm experimentally,and show that our approach achieves state-of-the-art performance.

关键词： image interpolation view synthesis homo-graphy propagation belief propagation

来源：评论

学校读者我要写书评

暂无评论

Real-Time Laparoscopic Cholecystectomy Simulation Using a Particle-Based Physical System

引用

Complex System Modeling and Simulation 2022年第2期2卷 186-196页

作者： Hongyu Wu Fan Ye Yang Gao Yu Cong Aimin Hao State Key Laboratory of Virtual Reality Technology and Systems Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Research Unit of Virtual Human and Virtual Surgery(2019RU004) Chinese Academy of Medical SciencesBeijing 100730China Beijing UniDraw Virtual Reality Technology Research Institute Co. LtdBeijing 101300China

Laparoscopic cholecystectomy is used to treat cholecystitis and *** the high risk of the surgery prevents novice doctors from practicing it on real patients,VR-based surgical simulation has been developed to simulate surgical procedures to train surgeons without patients,cadavers,or *** this study,we propose a real-time system designed to provide plausible visual and tactile simulation of the main surgical *** achieve this,the physical properties of organs are modeled by particles,and cluster-based shape matching is used to simulate soft *** haptic interaction between tools and soft tissue is modeled as a collision between a capsule and ***-based haptic rendering is used to generate feedback force and the non-penetrating position of the virtual *** proposed system can simulate the major steps of laparoscopic cholecystectomy,such as the anatomy of Calot’s triangle,clipping of the cystic duct and biliary artery,disjunction of the cystic duct and biliary artery,and separation of the gallbladder *** experimental results show that haptic rendering can be performed at a high frequency(>900 Hz),whereas mesh skinning and graphics rendering can be performed at 60 frames per second(fps).

关键词： virtual surgery laparoscopic cholecystectomy position-based dynamics

来源：评论

学校读者我要写书评

暂无评论

A Parallel Markov Cerebrovascular Segmentation Algorithm Based on Statistical Model

引用

Journal of Computer Science & technology 2016年第2期31卷 400-416页

作者： Rong-Fei Cao Xing-Ce Wang Zhong-Ke Wu Ming-Quan Zhou Xin-Yu Liu Department of Information Science and Technology Beijing Normal University Beijing 100875 China Engineering Research Center of Virtual Reality and Applications Ministry of Education Beijing 100875 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

For segmenting cerebral blood vessels from the time-of-flight magnetic resonance angiography （TOF-MRA） images accurately, we propose a parallel segmentation algorithm based on statistical model with Markov random field （MRF）. Firstly, we improve traditional non-local means filter with patch-based Fourier transformation to preprocess the TOF-MRA images. In this step, we mainly utilize the sparseness and self-similarity of the MRA brain images sequence. Secondly, we add the MRF information to the finite mixture mode （FMM） to fit the intensity distribution of medical images. We make use of the MRF in image sequence to estimate the proportion of cerebral tissues. Finally, we choose the particle swarm optimization （PSO） algorithm to parallelize the parameter estimation of FMM. A large number of experiments verify the high accuracy and robustness of our approach especially for narrow vessels. The work will offer significant assistance for physicians on the prevention and diagnosis of cerebrovascular diseases.

关键词： cerebrovascular segmentation non-local means filtering Markov random field particle swarm optimization algorithm

来源：评论

学校读者我要写书评

暂无评论

Temporal continuity of visual attention for future gaze prediction in immersive virtual reality

引用

virtual reality & Intelligent Hardware 2020年第2期2卷 142-152页

作者： Zhiming HU Sheng LI Meng GAI Department of Computer Science and Technology School of Electronic Engineering and Computer SciencePeking UniversityBeijing 100871China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China

Background Eye tracking te chnology is receiving increased attention in the field of virtual ***,future gaze prediction is crucial in pre-computation for many applications such as gaze-contingent rendering,advertisement placement,and content-based *** explore future gaze prediction,it is necessary to analyze the temporal continuity of visual attention in immersive virtual *** In this paper,the concept of temporal continuity of visual attention is ***,an autocorrelation function method is proposed to evaluate the temporal ***,the temporal continuity is analyzed in both free-viewing and task-oriented *** Specifically,in free-viewing conditions,the analysis of a free-viewing gaze dataset indicates that the temporal continuity performs well only within a short time interval.A task-oriented game scene condition was created and conducted to collect users'gaze *** analysis of the collected gaze data finds the temporal continuity has a similar performance with that of the free-viewing *** continuity can be applied to future gaze prediction and if it is good,users'current gaze positions can be directly utilized to predict their gaze positions in the *** The current gaze's future prediction performances are further evaluated in both free-viewing and task-oriented conditions and discover that the current gaze can be efficiently applied to the task of short-term future gaze *** task of long-term gaze prediction still remains to be explored.

关键词： Temporal continuity Visual attention Autocorrelation analysis Gaze prediction virtual reality

来源：评论

学校读者我要写书评

暂无评论

Rapid and high-quality 3D fusion of heterogeneous CT and MRI data for the human brain

引用

Science China(Information Sciences) 2019年第10期62卷 194-196页

作者： Zexue HE Li ZHU Minjie LI Jinyao LI Yiran CHEN Yanlin LUO College of Information Science and Technology Beijing Normal University Department of Otolaryngology Head and Neck Surgery Peking University Third Hospital Engineering Research Center of Virtual Reality and Applications Ministry of Education (MOE)

Data obtained from computed tomography(CT)and magnetic resonance imaging(MRI) that describe the human brain is commonly used in medical research and diagnosis [1]. CT data are used to efficiently present high-density features, whereas MRI data are better suited for soft-tissue presentation [2]. The complementary functions of CT and MRI may be used to further develop med-

关键词： Rapid and high-quality 3D fusion of heterogeneous CT and MRI data for the human brain MRI

来源：评论

学校读者我要写书评

暂无评论

Skull ethnic classification by combining skull auxiliary image with deep learning

引用

Quantitative Biology 2022年第4期10卷 381-389页

作者： Huijie Sun Junli Zhao Chengyuan Wang Yi Li Niankai Zhang Mingquan Zhou College of Computer Science and Technology Qingdao UniversityQingdao 266071China Engineering Research Center of Virtual Reality and Applications Ministry of EducationBeijing 100875China

Background:China is a multi-ethnic *** is of great significance for the skull identification to realize the skull ethnic classification through computers,which can promote the development of forensic anthropology and accelerate the exploration of national ***:In this paper,the 3D skull model is transformed into 2D auxiliary image including curvature,depth and elevation information,and then the deep learning method of the 2D auxiliary image is used for ethnic *** construct a convolution neural network structure inspired by VGGNet16 which has achieved excellent performance on image *** order to optimize the network,Adam algorithm is adopted to avoid falling into local minimum,and to ensure the stability of the algorithm with regularization ***:Experiments on 400 skull models have been conducted for ethnic classification by our *** set different learning rates to compare the performance of the model,the highest accuracy of ethnic classification is 98.75%,which have better performance than other five classical neural network ***:Deep learning based on skull auxiliary image for skull ethnic classification is an automatic and effective method with great application significance.

关键词： skull auxiliary image deep learning skull ethnic classification convolutional neural network

来源：评论

学校读者我要写书评

暂无评论

Simulation of collective pursuit-evasion behavior with runtime situational awareness

Simulation of collective pursuit-evasion behavior with runti...

引用

作者： Yu, Zhenjing Tan, Junyin Li, Sheng School of Computer Science Peking University Beijing China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Beijing China

We present a simulation method of pursuit-evasion behaviors between different herds with runtime situational awareness. We model the collective movement of predators and prey in the hunting process based on an improved Boid model and the finite state machine involving multiple perception factors about the situations. Taking wolves hunting caribous as an example, our method not only simulates the collective behavior, but also realizes individual intelligent behaviors consistent with the observations. We conducted intensive experiments, and the results show that our method can simulate more realistic pursuit-evasion behavior under different testing scenarios with a variety of parameters. Our method can be easily transferred to the theoretical study of collective behaviors of other herds. © 2022 John Wiley & Sons Ltd.

关键词： collective behavior perception pursuit-evasion situational awareness

来源：评论

学校读者我要写书评

暂无评论

Interaction+: Interaction enhancement for web-based visualizations 10

Interaction+: Interaction enhancement for web-based visualiz...

引用

10th IEEE Pacific visualization Symposium, PacificVis 2017

作者： Lu, Min Liang, Jie Zhang, Yu Li, Guozheng Chen, Siming Li, Zongru Yuan, Xiaoru Peking University China School of Engineer and Information Technology University of Technology Sydney Australia Beijing Engineering Research Center of Virtual Simulation and Visualization China

ISBN: (纸本)9781509057382

In this work, we present Interaction+, a tool that enhances the interactive capability of existing web-based visualizations. Different from the toolkits for authoring interactions during the visualization construction, Interaction+ takes existing visualizations as input, analyzes the visual objects, and provides users with a suite of interactions to facilitate the visual exploration, including selection, aggregation, arrangement, comparison, filtering, and annotation. Without accessing the underlying data or process how the visualization is constructed, Interaction+ is application-independent and can be employed in various visualizations on the web. We demonstrate its usage in two scenarios and evaluate its effectiveness with a qualitative user study. © 2017 IEEE.

关键词： visualization

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

Next generation stress inoculation training for life saving skills using prosthetics

Next generation stress inoculation training for life saving ...

引用

作者： Wiederhold, Mark D. Salva, Angela M. Sotomayor, Teresita Coiro, Cheryl Wiederhold, Brenda K. Virtual Reality Medical Center Orlando FL United States Virtual Reality Medical Center San Diego CA United States U.S. Army Research Development and Engineering Command Simulation Training Technology Center Orlando FL United States

ISBN: (纸本)9781607500179

By integrating medical science with cutting edge simulation and training technologies, realistic prosthetic tissue, wounds, and part task trainers have been developed for the training of trauma care clinicians. The next generation of Stress Inoculation Training (SIT) includes the use of prosthetics developed based on human anatomy and physiology, material science, and nanotechnology. Testing has revealed that these products are highly useful and reliable. © 2009 The Interactive Media Institute and IOS Press. All rights reserved.

关键词： Tissue

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：