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IEEE International Conference on Image Processing

作者： Qiuwen Zhang Ping An Yan Zhang Liquan Shen Zhaoyang Zhang School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Displays and System Application Ministry of Education China Department of Computer Science and Technology Anhui University of Finance and Economics China

Inaccuracy depth estimation may influence on depth coding and virtual view rendering in the free-viewpoint television (FTV) system, an improved depth map estimation is proposed to solve the problem for coding and view synthesis. Firstly, check the consistency of initial depth, and the influence of initial miss-matches is minimized by introduction of an additional adaptive matching error selection that penalizes the unreliable matches. Then according to certain criteria, the multi-reference depth maps are merged into one disparity map to improve the quality of disparity map. Finally, a multilateral filtering is used to preserve details in the depth map and simultaneously smooth the depths in occluded areas at object boundary, less texture and discontinuity regions. Experimental results show a significant improvement of the initial input depth maps and coding efficiency, as well as a reduction of view synthesis artifacts.

关键词： Estimation Image coding Rendering (computer graphics) Transform coding Three dimensional displays Filtering

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Improved multi-view depth estimation for view synthesis in 3D video coding

Improved multi-view depth estimation for view synthesis in 3...

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3DTV Conference

ISBN: (纸本)9781612841618

Multi-view depth estimation is an important part in the virtual view synthesis and depth map coding within the 3DV/FTV applications. However, existing depth estimation methods generally have difficulty to generate good depth results around object edges or in areas with less texture. To solve this problem, we propose an improved algorithm to obtain a smooth and accurate depth map for view synthesis in 3D video coding. The proposed method aims to preserve details in the depth map and simultaneously smooth depths in object boundary occluded area, less texture and discontinuity regions, to avoid blurring in the synthesized views. Experimental results show a significant improvement of the initial input depth maps and coding efficiency, as well as a reduction of view synthesis artifacts.

关键词： Estimation Pixel Three dimensional displays Encoding Rendering (computer graphics) Image coding Transform coding

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Efficient rendering distortion estimation for depth map compression

Efficient rendering distortion estimation for depth map comp...

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IEEE International Conference on Image Processing

作者： Qiuwen Zhang Ping An Yan Zhang Zhaoyang Zhang School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Displays and System Application Ministry of Education China Department of Computer Science and Technology Anhui University of Finance and Economics China

A depth map represents three-dimensional (3D) scene information and is used to synthesize virtual views in 3D video. Since the quality of synthesized virtual views highly depends on the quality of depth map, efficient depth compression is crucial to realize the 3D video system. However compressing depth map using existing video coding techniques yields unacceptable distortions while rendering virtual views. To solve this problem, we propose an efficient depth map compression method for the view rendering, a novel distortion metric base on view rendering distortions instead of distortion of depth map itself. First, we derive relationships between distortions in coded depth map and rendered view. Then, a region based video characteristics distortion model is proposed for precisely estimation distortion in view synthesis. Finally, experimental results have shown that 1.8 dB coding gain in terms of PSNR and subjective quality improvement of synthesized views are achieved by the proposed method.

关键词： Image coding Rendering (computer graphics) Three dimensional displays Cameras Geometry Encoding Estimation

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A novel method on incremental information acquisition for deep web

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Journal of Convergence Information Technology 2011年第6期6卷 383-389页

作者： Wei, Fang Wu-bin, Pan Zhi-Ming, Cui Jiangsu Engineering Center of Network Monitoring NanJing University of Information Science and Technology NanJing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China JiangSu Province Support Software Engineering R and D Center for Information Technology Application in Enterprise Suzhou China

Deep Web is autonomous, independently updating, and its data are always in a state of frequent update. However, the user always hopes to obtain the newest content in the current Web database. Different from previous research, this paper wants to emphasize the importance of updating frequency in the study of Deep Web information acquisition. And, an approach on incremental information acquisition based on logical reinforcement learning has been proposed. Then, we find in our research that under the same condition of constraint resources, the novel approach can improve the freshness of data, discovery efficiency of new data and the service quality of Deep Web information integration.

关键词： Reinforcement learning

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High current density ternary-alloy-film dispenser cathode for terahertz vacuum devices

High current density ternary-alloy-film dispenser cathode fo...

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International Conference on Vacuum Electronics

作者： R. K. Barik R. S. Raju A. K. Tanwar Supriyo Das G. S. Park School of Electrical Engineering and Computer Science Seoul National University South Korea Central Electronics Engineering Research Institute (CEERI) Pilani Raj India Departrnent of Physics and Astronomy Seoul National University South Korea Central Electronics Engineering Research Institute (CEERI) Pilani Pilani Raj India School of Electrical Engineering and Computer Science Seoul National University Center for THz-Bio Application Systems South Korea

Dispenser cathode is used in microwave tubes as source of electrons. We investigate high current density emission capabilities of alloy-coated cathodes used for terahertz vacuum devices. In this paper the developmental work carried out on ternary-alloy-film cathode (2Os:2Re:1W) and the results are presented. The cathodes were tested inside a closed spaced diode and also analytical chamber containing Auger Electron Spectroscopy (AES), Thermionic Emission Microscope (THEM) facility. Emission current densities measured in the diode structure at 1300° K temperature were above 60 A/cm 2 . The work function was found 1.72 eV using 73% slope method. To ensure the life of the cathode accelerated life test has been carried out in closed spaced diode at 1300° K temperature.

关键词： Cathodes Current density Temperature measurement Temperature Metals Life estimation Surface treatment

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Heuristic information retrieval using variable identifiers in mobile ad-hoc networks

Heuristic information retrieval using variable identifiers i...

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3rd IEEE International Conference on Intelligent Networking and CollaborativeSystems, INCoS 2011

作者： Kume, Kazuki Ohnishi, Kei Tsukamoto, Kazuya Yamamura, Shinya Nagata, Akira Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-shi Fukuoka 820-8502 Japan Fujitsu Kyushu Network Technologies Limited Fujitsu Kyushu R and D Center 2-2-1 Momochihama Sawara-ku Fukuoka 814-8588 Japan Network Application Engineering Laboratories Ltd. JPR Hakata Building 1-4-4 Hakataekimae Hakata-ku Fukuoka 812-0011 Japan

ISBN: (纸本)9780769545790

We observe through simulations that an information sharing scheme using variable identifiers in mobile ad-hoc networks, which we previously proposed, enables us to heuristically find desired information by having identifiers varied. In the information sharing, people create identifiers that represent their interest, and information published by the people are probabilistically propagated using distances between identifiers of the people. The identifiers of the people dynamically change depending on people surrounding each person. Under a situation that an identifier is variable, we set how many times people obtained desired information to be an observation item. Also, we consider a process that people heuristically find desired information into a simulation model and set how many times people obtain such information to be an observation item. In simulations, we show examples of observation for these items. © 2011 IEEE.

关键词： Mobile ad hoc networks

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Heuristic Information Retrieval Using Variable Identifiers in Mobile Ad-hoc Networks

Heuristic Information Retrieval Using Variable Identifiers i...

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International Conference on Intelligent Networking and Collaborative Systems (INCOS)

作者： Kazuki Kume Kei Ohnishi Kazuya Tsukamoto Shinya Yamamura Akira Nagata Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan Fujitsu Kyushu Research and Development Center Fujitsu Kyushu Network Technologies Limited Fukuoka Japan Network Application engineering Laboratories Limited Fukuoka Japan

关键词： Humans Ad hoc networks Mobile communication Modeling Mobile computing Probabilistic logic Electronic mail

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Risk-driven web services selection based on stochastic QoS

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ICIC Express Letters 2011年第7期5卷 2269-2274页

作者： Fu, Xiaodong Yue, Kun Zou, Ping Wang, Feng Yunnan Key Lab of Computer Technology Application Kunming University of Science and Technology No. 68 Wenchan Road 121 Ave. Kunming 650500 China Faculty of Information Engineering and Automation Kunming University of Science and Technology No. 68 Wenchan Road 121 Ave. Kunming 650500 China School of Information Science and Engineering Yunnan University No. 2 Cuihu North Road Kunming 650091 China

Open and dynamic environments lead to the stochastic nature of QoS (Quality of Service). This makes customers be required to select the Web services with minimal risk so that the possibility of the difference between actual QoS performance and the ex- pected is minimized. In this paper, we propose a stochastic QoS-aware services selection approach that is formulated as a stochastic Multiple Attribute Decision Making (MADM) model. In this model, QoS of the candidate services is random variables with known probability distributions. By combining user constraints and probability distributions of QoS, semi-variance is used to evaluate QoS risk of alternatives. Thus, the stochastic MADM problem can be transformed into a deterministic one, which is solved with Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). Example and simulation results show the effectiveness of our approach for services selection. © 2011.

关键词： Quality of service

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Reference point estimation in fingerprint image

Reference point estimation in fingerprint image

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2010 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2010

作者： Geevar, C.Z. Lal, P. Sojan Department of Computer Application MES College of Engineering Kuttippuram India School of Computer Science Mahatma Gandhi University Kottayam India

ISBN: (纸本)9781424459674

Due to different imaging conditions, a fingerprint image may suffer from problems like translation, rotation, scaling and elastic distortion. A fingerprint recognition algorithm should address these problems for efficiency. One solution is to uniquely detect a reference point and align the fingerprint image based on the detected reference point. Accurate estimation of reference point is one of the major challenges in an automatic fingerprint recognition system. This paper presents a novel method to estimate a reference point for all types of fingerprints by tracing the chain coded contour of a fingerprint image. Chain codes are used to represent an image contour by a connected sequence of straight line segments of specified length and direction. The algorithm identifies the unique reference point as the point of maximum curvature changes in the fingerprint convex ridges. Experimental results show that our proposed algorithm can uniquely estimate a reference point for all types of fingerprints. © 2010 IEEE.

关键词： Chains

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Research on network security situation prediction-oriented adaptive learning neuron

Research on network security situation prediction-oriented a...

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2nd International Conference on Networks Security, Wireless Communications and Trusted Computing, NSWCTC 2010

作者： Li, Jing Dong, Chunbo School of Computer Science and Information Engineering Harbin Normal University Harbin China Department of Computer Application Engineering Daqing Vocational College Daqing China

ISBN: (纸本)9780769540115

Network security situation perception is to predict the probability of attacks, may occur in the future, by a variety of predicting methods, by recent network attacking data obtained from IDS (Intrusion Detection System). Neural Network model has many features, high degree of fault tolerance, associability, self-organizing and self-learning ability, and strong nonlinear mapping and generalization for a complex system, for example. Therefore, Neural Network was applied to the field of network security situation prediction. Adaptive Learning of neuron was introduced. It will be more flexibility to meet changing security environment of such a complex system requirements. The design and achievement of the adaptive learning neuron was stated in detail. © 2010 IEEE.

关键词： Network security

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