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21st ACM Symposium on virtual reality Software and technology, VRST 2015

作者： Qian, Kun Bai, Junxuan Yang, Xiaosong Pan, Junjun Zhang, Jianjun National Center for Computer Animation Bournemouth University United Kingdom State Key Laboratory of Virtual Reality Technology and Systems Beihang University China

ISBN: (纸本)9781450339902

With the development of computer graphic and haptic devices, training surgeons with virtual reality technology has proven to be very effective in surgery simulation. Many successful simulators have been deployed for training medical students. However, due to the various unsolved technical issues, the laparoscopic surgery simulation has not been widely used. Such issues include modeling of complex anatomy structure, large soft tissue deformation, frequent surgical tools interactions, and the rendering of complex material under the illumination of headlight. A successful laparoscopic surgery simulator should integrate all these required components in a balanced and efficient manner to achieve both visual/haptic quality and a satisfactory refreshing rate. In this paper, we propose an efficient framework integrating a set of specially tailored and designed techniques, ranging from deformation simulation, collision detection, soft tissue dissection and rendering. We optimize all the components based on the actual requirement of laparoscopic surgery in order to achieve an improved overall performance of fidelity and responding speed. © 2015 ACM.

关键词： Deformation

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Modal space subdivision for physically-plausible 4d shape sequence completion from sparse samples 23

Modal space subdivision for physically-plausible 4d shape se...

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23rd Pacific Conference on computer Graphics and Applications, PG 2015

作者： Xia, Qing Li, Shuai Qin, Hong Hao, Aimin State Key Laboratory of Virtual Reality Technology and Systems Beihang University China Department of Computer Science Stony Brook University United States

ISBN: (纸本)9783905674965

Subdivision techniques are powerful and ubiquitous in generating smooth surfaces from coarse 3D polygonal models, yet space-time subdivision remains unexplored when the goal is to produce dense physically-realistic shape sequence with smooth transition from a set of sparse 3D model samples. In this paper, we considers a completely data-driven strategy and proposes a novel modal space subdivision scheme to facilitate the rapid generation of physically-plausible "in-between" shapes from sparse model samples. The key idea of our approach is to abstract any shape as a point in modal space, represent its potential deformation with shape modes, and iteratively seek all the intermediate shapes between two consecutive models in the modal space via recursive subdivision. Meanwhile, to guarantee deformation details, we further interpolate the shape in the local regions after global modal-space subdivision. Comprehensive experiments on various model inputs have demonstrated the power, versatility, high performance, and potential of our modal space subdivision scheme. © The Eurographics Association 2015.

关键词： Deformation

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RETRACTED: Graphic and haptic simulation for transvaginal cholecystectomy training in NOTES

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Journal of Biomedical Informatics 2016年 60卷 410-421页

作者： Jun J. Pan Woojin Ahn Saurabh Dargar Tansel Halic Bai C. Li Ganesh Sankaranarayanan Kurt Roberts Steven Schwaitzberg Suvranu De State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Center for Modeling Simulation and Imaging in Medicine Rensselaer Polytechnic Institute Troy USA Computer Science Department University of Central Arkansas Conway USA Gastrointestinal Surgery Yale School of Medicine Yale University New Heaven USA Department of Surgery Cambridge Health Alliance Harvard Medical School Boston USA

This article has been retracted: please see Elsevier Policy on Article Withdrawal ( http://***/locate/withdrawalpolicy ). This article has been retracted at the request of the Editor-in-Chief. The Publisher and Editor have been informed that the article was submitted to the journal without the consent of all the coauthors. The coauthor Suvranu De expressed concerns regarding the validity of some of the techniques and data reported in the paper, particularly in Figure 18 and Table 3. In addition, we identified in the article a significant portion of copied text that came from the following publications: Metaballs-based physical modeling and deformation of organs for virtual surgery Junjun Pan, Chengkai Zhao, Xin Zhao, Aimin Hao, Hong Qin The Visual computer , June 2015, Volume 31, Issue 6, pp 947–957 DOI: 10.1007/s00371-015-1106-y virtual reality training and assessment in laparoscopic rectum surgery Jun J. Pan, Jian Chang, Xiaosong Yang, Hui Liang, Jian J. Zhang, Tahseen Qureshi, Robert Howell and Tamas Hickish The International Journal of Medical Robotics and computer Assisted Surgery , Volume 11, Issue 2, pages 194–209 DOI: 10.1002/rcs.1582 As such, this article represents an abuse of the scientific publishing system, which we believe warrants the retraction of the article. The scientific community takes a very strong view on this matter and apologies are offered to the readers of the journal that our processes, which have since been updated, did not adequately verify the assent of the coauthors and their approval of the paper’s content.

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virtual brain surgery simulation system based on haptic interaction

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High technology Letters 2015年第2期21卷 185-191页

作者：张小瑞 Zhu Jiandong Sun Wei Norman I.Badler Song Aiguo Niu Jianwei Liu Jia School of Computer and Software Nanjing University of Information Science & Technology Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology School of Information and Control Nanjing University of Information Science & Technology School of Engineering and Applied Science University of Pennsylvania School of Instrument Science and Engineering Southeast University State key Laboratory of Virtual Reality Technology and Systems Beihang University

To improve the accuracy and interactivity of soft tissue delormatlon simulation, a new plate spring model based on physics is proposed. The model is parameterized and thus can be adapted to simulate different organs. Different soft tissues are modeled by changing the width, number of pieces, thickness, and length of a single plate spring. In this paper, the structural design, calcula- tion of soft tissue deformation and real-time feedback operations of our system are also introduced. To evaluate the feasibility of the system and validate the model, an experimental system of haptic in- teraction, in which users can use virtual hands to pull virtual brain tissues, is built using PHANTOM OMNI devices. Experimental results show that the proposed system is stable, accurate and promising for modeling instantaneous soft tissue deformation.

关键词： haptic feedback human-computer interaction surgery simulation soft tissue deformation

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Video moving object detection based on region classification using three-order central moment

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2015年第5期27卷 832-840and846页

作者： Zheng, Jin Li, Bo Beijing Key Laboratory of Digital Media School of Computer Science and Engineering Beihang University Beijing100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing100191 China

For the complex outdoor video surveillance, the existing moving object detection methods are difficult to overcome the background interference and accurately detect slow moving objects, as well as small objects simultaneously. These methods have the problem of low accuracy. This paper proposes a moving object detection method based on region classification using three-order central moment. For the different change characteristics of the different pixels in foreground region, cluster region, and background region, which imply the true motion, meaningless motion and background noise, three-order central moment is employed to build the corresponding relationship between the changes of pixel values and the classification of different regions. Therefore, the classifier based on three-order central moments is designed to adaptively classify the scene regions. Accordingly, the moving objects can be detected based on the region classification. The experimental results demonstrate that the proposed method can classify the different regions for outdoor video surveillance effectively. It also can overcome the background interference, e.g., branches swings and water fluctuates, and can detect slow objects and moving small objects accurately. ©, 2015, Institute of Computing technology. All right reserved.

关键词： Pixels

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A spaceborne WAS-GMTI mode based on azimuth multi-channels

A spaceborne WAS-GMTI mode based on azimuth multi-channels

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IET International Radar Conference 2015

作者： Zheng, Shichao Niu, Jianwei Wang, Hui Han, Xiaolei State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China Institute of Electronics Chinese Academy of Sciences Beijing China Beijing Institute of Spacecraft System Engineering Beijing China

ISBN: (纸本)9781849199940

In this paper, the spaceborne wide-area surveillance ground moving target indication (WAS-GMTI) mode is proposed. In the proposed mode, the requirement of detecting targets from different aspect angles with a high revisit rate can be achieved by modifying the TOPS mode which steers antenna in the azimuth direction. And a three-channel system is chosen to achieve fine GMTI performance. With the three-channel system, the detection of moving targets is realized by displaced phase center antenna (DPCA) technique and the motion parameter is estimated using the interferometric phase. The feasibility of the proposed mode as well as the performance of GMTI is validated by theoretical analysis and simulation experiments.

关键词： Synthetic aperture radar

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A Chinese Character Component Recognition Method based on Optimal Combined Strategy

A Chinese Character Component Recognition Method based on Op...

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2015 IEEE International Conference on computer and Communications(ICCC 2015)

作者： Yongtang Bao Yue Qi Min Liu State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University

Chinese character component recognition plays an important role in Chinese character studying process. In this digital age, using the technology of computer science to analyzing Chinese character component, has a very important significance for the development of traditional culture. In this paper, we propose an optimal combined strategy based method for component recognition. First, we execute preprocessing for all input images. For each image, we process it with image binaryzation and homogenization. Second, we generate the candidate strokes from the results of preprocessing step. Third, we construct the search graph and calculate the possible solution for searching component. Finally, we describe the detailed algorithm for component recognition using optimal combined strategy. Our method can produce accurate Chinese character component recognition results.

关键词： optimal combined strategy component recognition Chinese character

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OBJECT-BASED FEATURE EXTRACTION AND SEMI-SUPERVISED CLASSIFICATION FOR URBAN CHANGE DETECTION USING HIGH-RESOLUTION REMOTE SENSING IMAGES

OBJECT-BASED FEATURE EXTRACTION AND SEMI-SUPERVISED CLASSIFI...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Bin Hou Qingjie Liu Yunhong Wang State Key Laboratory of Virtual Reality Technology and Systems The School of Computer Science and Engineering Beihang University

ISBN: (纸本)9781479979301

This paper presents a novel approach for urban change detection of high resolution (HR) remote sensing images. To overcome deficiency of traditional pixel-based methods and better annotate HR images, object-based strategies are adopted. Firstly change vector analysis (CVA) and local binary patterns (LBP) are utilized to extract the object-specific features based on the image-objects acquired by multitemporal segmentation. Then sparse representation is further exploited to characterize highly effective sparse features. Finally, the final change map is obtained by support vector machine (SVM) with the pseudotraining set acquired by expectation maximization (EM). Comparative experiments demonstrate the effectiveness of the proposed method.

关键词： feature extraction geophysical image processing geophysical techniques image classification image segmentation remote sensing support vector machines CVA LBP SVM change vector analysis expectation maximization high-resolution remote sensing images local binary patterns multitemporal segmentation object-based feature extraction semisupervised classification support vector machine traditional pixel-based method urban change detection Dictionaries Feature extraction Image color analysis Image resolution Image segmentation Principal component analysis Remote sensing Object-based method high resolution semi-supervised sparse representation Support Vector Network Feature extraction image segmentation remote sensing image colour analysis Cherry virus A Stroke Cyclophosphamide/Doxorubicin/Vincristine sparse representation image resolution Dictionaries as Topic geophysical techniques LBP gene LBP object orientation

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Chinese Character Image Retrieval Based on Moment Invariants and Shape Context

Chinese Character Image Retrieval Based on Moment Invariants...

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2015 IEEE International Conference on computer and Communications(ICCC 2015)

作者： Huanian Zhan Yue Qi State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University

this paper presents a retrieval method for the image of Chinese characters calligraphy. The precision and recall rate are main indicators to measure the quality of image retrieval algorithm. Starting from the two aspects, there are two parts in the process of image retrieve which is proposed in this paper. In this paper, carry out the retrieve with the Hu invariant moment matching algorithm, which is fast and efficient, but little of the accuracy. Then, execute trice retrieval with shape context algorithm taking the advantages of high level of accuracy and good robustness based on the result set of the first retrieval. Experiments show that the method referred in this paper is accurate and efficient.

关键词： calligraphy image retrieval moment invariants shape context matching

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Graphic and haptic simulation for transvaginal cholecystectomy training in NOTES

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Journal of Biomedical Informatics 2016年 60卷 410-421页

作者： Pan, Jun J. Ahn, Woojin Dargar, Saurabh Halic, Tansel Li, Bai C. Sankaranarayanan, Ganesh Roberts, Kurt Schwaitzberg, Steven De, Suvranu State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Center for Modeling Simulation and Imaging in Medicine Rensselaer Polytechnic Institute Troy United States Computer Science Department University of Central Arkansas Conway United States Gastrointestinal Surgery Yale School of Medicine Yale University New Heaven United States Department of Surgery Cambridge Health Alliance Harvard Medical School Boston United States

Background: Natural Orifice Transluminal Endoscopic Surgery (NOTES) provides an emerging surgical technique which usually needs a long learning curve for surgeons. virtual reality (VR) medical simulators with vision and haptic feedback can usually offer an efficient and cost-effective alternative without risk to the traditional training approaches. Under this motivation, we developed the first virtual reality simulator for transvaginal cholecystectomy in NOTES (VTEST™). Methods: This VR-based surgical simulator aims to simulate the hybrid NOTES of cholecystectomy. We use a 6DOF haptic device and a tracking sensor to construct the core hardware component of simulator. For software, an innovative approach based on the inner-spheres is presented to deform the organs in real time. To handle the frequent collision between soft tissue and surgical instruments, an adaptive collision detection method based on GPU is designed and implemented. To give a realistic visual performance of gallbladder fat tissue removal by cautery hook, a multi-layer hexahedral model is presented to simulate the electric dissection of fat tissue. Results: From the experimental results, trainees can operate in real time with high degree of stability and fidelity. A preliminary study was also performed to evaluate the realism and the usefulness of this hybrid NOTES simulator. Conclusions: This prototyped simulation system has been verified by surgeons through a pilot study. Some items of its visual performance and the utility were rated fairly high by the participants during testing. It exhibits the potential to improve the surgical skills of trainee and effectively shorten their learning curve. © 2016 Elsevier Inc.

关键词： virtual reality

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