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Personalized cardiovascular intervention simulation system

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

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Robust and accurate calibration point extraction with multi-scale chess-board feature detector

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 437卷 153-164页

作者： Liu, Yang Chen, Yisong Wang, Guoping Shenzhen Graduate School Peking University Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization China Graphics Lab of EECS Peking University Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization China

ISBN: (纸本)9783662454978

Chess-board grid has been widely used for camera calibration and the associated feature point extraction algorithm draws much attention. In this paper, a multi-scale chess-board feature point detector is proposed, along with a chess-board matching algorithm for a specific marker used in our 3D reconstruction system. Experiments show that our method is more robust and accurate compared to commonly used approaches. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Calibration

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A new optical tracking system for virtual and augmented reality applications

A new optical tracking system for virtual and augmented real...

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IEEE Instrumentation and Measurement technology Conference

作者： M. Ribo A. Pinz A.L. Fuhrmann Center for Virtual Reality and Visualization Vienna Austria Institute of Electrical Measurement and Measurement Signal Processing Graz University of Technology Austria

ISBN: (纸本)0780366468

A new stereo vision tracker setup for virtual and augmented reality applications is presented in this paper. The performance, robustness and accuracy of the system are achieved under real-time constraints. The method is based on blobs extraction, two-dimensional prediction, the epipolar constraint and three-dimensional reconstruction. Experimental results using a stereo rig setup (equipped with IR capabilities) and retroreflective targets are presented to demonstrate the capabilities of our optical tracking system. The system tracks up to 25 independent targets at 30 Hz.

关键词： Augmented reality Target tracking virtual reality Layout Optical signal processing Real time systems visualization Electric variables measurement Stereo vision Robustness

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Advanced illumination techniques for GPU-based volume raycasting 09

Advanced illumination techniques for GPU-based volume raycas...

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ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Hadwiger, Markus Ljung, Patric Salama, Christof Rezk Ropinski, Timo VRVis Research Center for Virtual Reality and Visualization Donau-City-Straße 1 A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9781450379380

Volume raycasting techniques are important for both visual arts and visualization. They allow efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical simulation. Volume-rendering techniques are also effective for direct rendering of implicit surfaces used for soft-body animation and constructive solid geometry. The focus of this course is on volumetric illumination techniques that approximate physically based light transport in participating media. Such techniques include interactive implementation of soft and hard shadows, ambient occlusion, and simple Monte Carlo-based approaches to global illumination, including translucency and scattering.

关键词： visualization

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Laplacian-based 3D mesh simplification with feature preservation

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第2期10卷 64-82页

作者： Wei Lyu Wei Wu Lin Zhang Zhaohui Wu Zhong Zhou State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 P.R.China Generic Technology Center Systems Engineering Research Institute Beijing 100036 P.R.China Transportation Basic Research and Applied Innovation Center China Academy of Transportation Sciences Beijing 100029 P.R.China

We propose a novel Laplacian-based algorithm that simplifies triangle surface meshes and can provide different preservation ratios of geometric *** efficient and fast algorithm uses a 3D mesh model as input and initially detects geometric features by using a Laplacian-based shape descriptor(L-descriptor).The algorithm further performs an optimized clustering approach that combines a Laplacian operator with K-means clustering algorithm to perform vertex ***,we introduce a Laplacian weighted cost function based on L-descriptor to perform feature weighting and error statistics comparison,which are further used to change the deletion order of the model elements and preserve the saliency *** algorithm can provide different preservation ratios of geometric features and may be extended to handle arbitrary mesh *** experiments on a variety of 3D surface meshes demonstrate the advantages of our algorithm in terms of improving accuracy and applicability,and preserving saliency geometric features.

关键词： Mesh simplification L-descriptor feature weighting feature metric feature preservation

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Color liquid crystal grating based color holographic 3D display system with large viewing angle

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Light(Science & Applications) 2024年第1期13卷 103-112页

作者： Di Wang Yi-Long Li Fan Chu Nan-Nan Li Zhao-Song Li Sin-Doo Lee Zhong-Quan Nie Chao Liu Qiong-Hua Wang School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Display Technology Research Center Seoul National UniversityGwanak-ro 1Gwanak-guSeoul 08826Republic of Korea Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

Holographic 3D display is highly desirable for numerous applications ranging from medical treatments to military ***,it is challenging to simultaneously achieve large viewing angle and high-fidelity color reconstruction due to the intractable constraints of existing ***,we conceptually propose and experimentally demonstrate a simple and feasible pathway of using a well-designed color liquid crystal grating to overcome the inevitable chromatic aberration and enlarge the holographic viewing angle,thus enabling large-viewing-angle and color holographic 3D *** use of color liquid crystal grating allows performing secondary diffraction modulation on red,green and blue reproduced images simultaneously and extending the viewing angle in the holographic 3D display *** principle,a chromatic aberration-free hologram generation mechanism in combination with the color liquid crystal grating is proposed to pave the way for on such a superior holographic 3D *** proposed system shows a color viewing angle of~50.12°,which is about 7 times that of the traditional system with a single spatial light *** work presents a paradigm for achieving desirable holographic 3D display,and is expected to provide a new way for the wide application of holographic display.

关键词： holographic angle crystal

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Preliminary Investigation of a Reactors Core Design Optimization 23

Preliminary Investigation of a Reactors Core Design Optimiza...

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3rd International Conference on Bioinformatics and Intelligent Computing, BIC 2023

作者： Li, Wenhuai Cai, Jiejin School of Electric Power South China University of Technology China China Nuclear Power Technology Research Institute Co. Ltd Shenzhen China Engineering Research Center of Advanced Nuclear Energy Artificial Intelligence and Virtual Reality Shenzhen China

ISBN: (纸本)9798400700200

Reactor design optimization is a challenging task that requires significant resources in terms of time, labor, and iteration. As advanced reactors continue to be developed, the design requirements and constraints may become more challenging, including economic, safety, and transportation considerations. Meeting these constraints and efficiently designing a reasonable reactor optimization solution within a short timeframe based on existing design experience is a significant challenge. In this paper, a combination of structure optimization and the characteristic statistical algorithm (CSA) is proposed to obtain reactor core optimization based on the existing limit of physics and thermal design. Neutronic design codes RMC/MCNTRANS are used to calculate neutronic performance, such as reactivity, power distribution, and fuel burnup. The thermal sub-channel code KMC-SUB is used to calculate coolant temperature. With the assistance of the Shenzhen Supercomputer center, a large-scale computation was carried out, and a set of optimized core schemes meeting the constraints of nuclear design were found. Data analysis was then used to determine key design variables to guide the direction of continuous core optimization. The results show the feasibility of using CSA for core design optimization and provide insight into the importance of different design variables. © 2023 ACM.

关键词： Supercomputers

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Realization of Reconfigurable virtual Environments for virtual Testing

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International Journal of Automation and computing 2005年第1期2卷 25-36页

作者： Wen-Yan Wu Zheng-Xu Zhao School of Computing Engineering & Technology Staffordshire University Stafford UK Virtual Reality Research Technology Center Southeast University Nanjing PRC

This paper presents the design and implementation of reconfigurable virtual environments (VEs) for virtual testing. It proposes a hybrid design approach that is derived from a so-called integration and composition of the reconfiguration strategy. The designing process has thus evolved from binding virtual objects using reconfiguration rules within the context of virtual testing scenarios. Therefore reconfigurable virtual environments are established with improved flexibility and scalability, tailored to a wide range of virtual testing applications. Those virtual environments integrate virtual testing scenarios, data acquisition, databases, rule mapping and application interfaces, which yield modular testing functions and an open-ended system architecture with a set of extensible interface tools to realize data exchange within reconfigurable VEs. This enables virtual testing scenarios to be reconfigured interactively based on real time data and communication between virtual environments and real environments. A virtual testing application has been implemented using reconfigurable VEs. Keywords virtual environment - virtual testing - reconfigurable virtual reality Wenyan Wu graduated from Dalian University of technology, China, with BSc and MSc in 1988 and 1991 respectively. She earned her PhD degree from University of Derby, UK, in 2002. She had taught and researched in Harbin Institute of technology, China and De Montfort University, UK. She is currently a senior lecturer in simulation and virtual reality at Staffordshire University, UK. Her research interests include computer graphics, virtual reality and Augmented reality system, advanced interface, modelling and simulation, distribution system. Zhengxu Zhao BSc, MSc, PhD, CEng, CITP, MBCS, full Professor in Applied Computing, Director of virtual reality Centre. He is also a Cheng Kong Scholar Project Professor in virtual reality technology and Director of virtual reality research Centre at the Southeast Uni

关键词： virtual environment virtual testing reconfigurable virtual reality

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A novel approach to frame rate measurement for real-time computer vision applications

A novel approach to frame rate measurement for real-time com...

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IEEE Instrumentation and Measurement technology Conference

作者： M. Brandner M. Ribo A. Pinz Institute of Electrical Measurement and Measurement Signal Processing Graz University of Technology Graz Austria Center for Virtual Reality and Visualization Vienna Austria

ISBN: (纸本)0780366468

An important factor of system performance for computer vision applications such as optical tracking systems or industrial inspection systems is the frame rate. Frame rate measurement requires access to either the application software or hardware. In order to be independent of different standards used by the application under test a non-intrusive method for frame rate measurement is proposed. The system consists of a hardware pattern generator which can be used 'stand-alone' as well as in combination with signal processing software to estimate the frame rate of a given application.

关键词： Application software Hardware System performance Computer vision Optical signal processing Computer industry Inspection Software measurement Measurement standards Testing

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Capacity model for two intersecting runways

Capacity model for two intersecting runways

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作者： Meng, Xiangwei Zhang, Ping Li, Chunjin State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China Research Center of Air Traffic Control Beihang University Beihang 100191 China

ISBN: (纸本)9789881725592

The accurate capacity evaluation of the runway system at an airport is prerequisite to air traffic flow management and also essential content of airport planning. In order to improve the logic for calculating departure capacity of the intersecting runways, a new capacity model for two intersecting runways is established based on MACAD (MANTEA Airfield Capacity and Delays model) and LMI runway capacity model. In this model, the effect of departures in previous inter-arrival gaps is considered in calculating the probability of inserting departures in current inter-arrival gap. The experiment on representative data of US commercial airports shows that the difference of freely inserted departure capacity derived from this model and MACAD model can reach as much as more than 3 aircraft per hour. The MACAD model has inserted too many free departures between arrivals because of not considering this effect. © 2011 Chinese Assoc of Automati.

关键词： Air traffic control

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