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2010 International Conference on Medical Image Analysis and Clinical Application, MIACA 2010

作者： Liao, Zhiwu Hu, Shaoxiang Yu, Zhiqiang Sun, Dan Visual Computing and Virtual Reality Key Laboratory Of Sichuan Province Sichuan Normal University Chengdu China School of Computer Science Sichuan Normal University Chengdu China School of Automation Engineering University of Electronic Science and Technology of China Chengdu China Chengdu Aircraft Industrial Co. Ltd. Chengdu China

ISBN: (纸本)9781424480128

Edge and detail preserving is a very important requirement in blind medical denoising since the details can help doctors diagnosis diseases. Bilateral flter (BF) is a famous filter in preserving details while smoothing. However, its performance in image denoising is unsatisfied. The main reason for this situation is that the bilateral filter uses gray levels of pixels directly, which causes the propagation of noise (PoN). In this paper, we propose a method, named context bilateral filter (CBF), which conditions the bilateral filter on the context. That is, the range filter is not defined on the gray levels directly while it is defned on the context! Since context can be defined as a smoother version for the image, the PoN can be suppressed greatly. In order to demonstrate the good performance for our method, experimental results using real medical images are given. © 2010 IEEE.

关键词： Image denoising

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To determine neighborhoods in ultrasound image denoising

To determine neighborhoods in ultrasound image denoising

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International Conference on Machine Learning and Cybernetics

作者： Liao, Zhiwu Hu, Shaoxiang Wang, Jianjun Yu, Zhiqiang Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Sichuan Normal University Chengdu China School of Computer Science Sichuan Normal University Chengdu China School of Automation Engineering University of Electronic Science and Technology of China Chengdu China Chinese Flight Test Establishment Xi'an China Chengdu Aircraft Industrial Co. Ltd. Chengdu China

ISBN: (纸本)9781424465262

Ultrasound images are effected by serious noises. In this paper, we propose an adaptive method by determining a variable neighborhood of each pixel in ultrasound image denoising. The real neighbors of a pixel can be chosen according to the local energy of the pixel, the distance between the pixel and its close pixels, the requirement of reliable estimate. All of the real neighbors of a pixel form a neighborhood, named the real neighborhood (RN) of the pixel. The RN s can preserve edges and obtain reliable estimates simultaneously, which can not be met at the same time and becomes a tradeoff problem in existing methods. The experiments also show better performance both in denoising and edges preserving than the state-of-art techniques. © 2010 IEEE.

关键词： Pixels

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An Optimized Model of Polyhedral Visual Hull Based on Feature Points Matching

An Optimized Model of Polyhedral Visual Hull Based on Featur...

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International Conference on Intelligent Computing and Cognitive Informatics (ICICCI)

作者： Guojun Chen Jie Jiang Huanhuan Su State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China College of Computer and Communication Engineering China University of Petroleum Dongying China China University of Petroleum Beijing Changping-qu Beijing CN

The 3D reconstruction based on the video image in real-time is an important problem, such as computer vision, computer graphics. The accuracy of the model is even the center issue of these fields. After considering the polyhedral visual hull (PVH) reconstruction method, this paper introduces a model optimized method based on the image feature points matching. In this paper, we present an algorithm that extracts the feature points from the public visible field of neighbor images, and finds the matched feature points by utilizing the epipolar relationships and the photo-consistency, and optimizes the original model by utilizing the matched feature points achieved and the original space location. The experimental results show that this method optimizes the original model efficiently and make the optimized model more accurate.

关键词： Visualization Solid modeling Cameras Pixel Three dimensional displays Image reconstruction Geometry

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A point-based rendering approach for real-time interaction on mobile devices

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Science in China(Series F) 2009年第8期52卷 1335-1345页

作者： LIANG XiaoHui ZHAO QinPing HE ZhiYing XIE Ke LIU YuBo State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Technology Beihang UniversityBeijing 100191 China

Mobile device is an important interactive platform. Due to the limitation of computation, memory, display area and energy, how to realize the efficient and real-time interaction of 3D models based on mobile devices is an important research topic. Considering features of mobile devices, this paper adopts remote rendering mode and point models, and then, proposes a transmission and rendering approach that could interact in real time. First, improved simplification algorithm based on MLS and display resolution of mobile devices is proposed. Then, a hierarchy selection of point models and a QoS transmission control strategy are given based on interest area of operator, interest degree of object in the virtual environment and rendering error. They can save the energy consumption. Finally, the rendering and interaction of point models are completed on mobile devices. The experiments show that our method is efficient.

关键词： virtual environment mobile devices point models simplification QoS control area of interest interest degree

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A MAC protocol for congested cognitive radio network

A MAC protocol for congested cognitive radio network

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2nd International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2009

作者： Yue, Song-Song Wu, Wei State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing China

ISBN: (纸本)9780769538525

This paper proposed a media access control (MAC) protocol for distributed cognitive radio network, which can work effectively in congested network by dynamic spectrum allocation. Cognitive nodes user chose the communication channel by negotiation, considering the channel usage of neighbours. The scheme can reduce the interference between nodes by selecting proper channel, improve the throughput of network significantly, especially when the network is highly congested. The simulation results show that our protocol outperforms the random allocation protocol by 48.2% in throughput. © 2009 IEEE.

关键词： Cognitive radio

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Automatic image inpainting by heuristic texture and structure completion

Automatic image inpainting by heuristic texture and structur...

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16th International Multimedia Modeling Conference on Advances in Multimedia Modeling, MMM 2010

作者： Chen, Xiaowu Xu, Fang State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)3642113001

This paper studies an image inpainting solution based on a primal sketch representation model [1], which divides an image into structure (sketchable) and texture (non-sketchable) components. This solution first predicts the missing structures, such as curves and corners, using a tensor voting algorithm [2]. Then the texture parts along structural sketches are synthesized with the patches sampled from the known regions, and the remaining texture parts are defused using a graph cuts algorithm [3]. Compared to the state-of-art image inpainting approaches, the characteristics of this solution include: 1) using the primal sketch representation model to guide completion for visual consistency;2) achieving fully automatic completion. Finally, the experiments on the public datasets show above characteristics. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Graphic methods

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Wireless spectrum prediction model based on time series analysis method

Wireless spectrum prediction model based on time series anal...

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2009 ACM Workshop on Cognitive Radio Networks, CoRoNet'09, Co-located with the Mobile Computing and Networking Conference, MobiCom'09

作者： Su, Jinzhao Wu, Wei State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science BeiJing University of Aeronautics and Astronautics China

ISBN: (纸本)9781605587387

Cognitive Radio (CR) is considered to be a solution for mitigating the conflict between limited spectrum resources and increasing demand of various applications. For the purpose of guaranteeing primary users, we propose a spectrum prediction model using the spectrum historic utilization information with time series analysis. We conduct experiment on wide TV bands of China from 603.25 MHzt o 843.25 MHz, the results show that this model can accurately predict status of channels and find vacant spectrum for cognitive users. We take channel 2 whose center frequency locates in 615.25 MHzfor example, average forecasting error ratio is 1.01% with a minimum of 0.79%. Copyright 2009 ACM.

关键词： Cognitive radio

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Accelerate cache simulation with generic GPU

Accelerate cache simulation with generic GPU

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IEEE 9th International Conference on computer and Information technology, CIT 2009

作者： Han, Wan Xiaopeng, Gao Zhiqiang, Wang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769538365

Trace-driven cache simulation is the most widely used method to evaluate different cache structures. Several techniques have been proposed to reduce the simulation time of sequential trace-driven simulation. An obvious way to achieve fast parallel simulation is to simulate the individual independent sets of a cache concurrently on different compute resources. We propose improvements to current trace-driven simulation methods to make them faster and more economical. This paper considers the use of generic GPU to accelerate cache simulation which exploits set-partitioning as the main source of parallelism. We develop more efficient parallel simulation techniques by introducing more knowledge into the Compute Unified Device Architecture (CUDA) on the GPU. Our experimental result shows that the new algorithm can produce performance results for a number of set-associative caches in just a single simulation run and still produce the exact results. © 2009 IEEE.

关键词： Graphics processing unit

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SimRC: An architecture modeling and simulator generation tool for reconfigurable computing development

SimRC: An architecture modeling and simulator generation too...

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IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009

作者： Liu, Yuexiao Gao, Xiaopeng Wu, Xingbo Lv, Liangshuang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

ISBN: (纸本)9780889868106

A modeling and simulation tool called SimRC is described in this paper. It is dedicated to improve the efficiency of reconfigurable computing development. In SimRC, a new architecture description language is designed for architecture modeling, and the target architecture simulator is generated according to that model with our code generation approach. In this way, SimRC achieves the general purpose in a certain scope. The results of the preliminary experiments show that not only SimRC is able to model various architectures, but also it achieves the high simulation efficiency.

关键词： Simulators

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Seamless virtual machine live migration on network security enhanced hypervisor

Seamless virtual machine live migration on network security ...

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2009 2nd IEEE International Conference on Broadband Network and Multimedia technology, IEEE IC-BNMT2009

作者： Xianqin, Chen Han, Wan Sumei, Wang Xiang, Long State Key Laboratory of Virtual Reality Technology System School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9781424450053

Since the virtual network traffic is invisible outside the hypervisor, it is impossible for traditional network-base security devices to harness the attacks happened in virtual computing environment. Industry and academies adopt the network security enabled hypervisor (NSE-H) to protect virtual machines (VM) residing in the virtual network. In this paper, we identified the insufficiency of the existing live migration implementation, which prevents itself from providing transparent VM relocation between NSE-Hs. This occurs because the contemporary migration implementation only takes VM encapsulated states into account, but ignores VM related security context(SC) needed by NSE-H embedded security engines (SE). We presented a comprehensive live migration framework for the NSE-H, considering both the execution context encapsulated in VM instance and the VM related security context within the SEs. We built a prototype system of the framework based on stateful firewall enabled Xen hypervisor. Our experiment was performed with realistic applications and the results demonstrate that the solution complements the insufficiency without introducing significant performance downgrade. Even in the worst case, the downtime that occurs during migration increases no more than 15%, comparing to existing implementation. ©2009 IEEE.

关键词： Network security

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