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3DV quality model based depth maps for view synthesis in FTV system

Journal of Shanghai University(English Edition) 2011年第4期15卷 335-341页

作者：张秋闻安平张艳张兆杨王元庆 Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of EducationShanghai 200072P.R.China School of Communication and Information Engineering Shanghai University Department of Computer Science and Technology Anhui University of Finance and EconomicsBengbu 230030AuhuiP.R.China Department of Electronics Science and Engineering Nanjing University

Depth maps are used for synthesis virtual view in free-viewpoint television （FTV） systems. When depth maps are derived using existing depth estimation methods, the depth distortions will cause undesirable artifacts in the synthesized views. To solve this problem, a 3D video quality model base depth maps （D-3DV） for virtual view synthesis and depth map coding in the FTV applications is proposed. First, the relationships between distortions in coded depth map and rendered view are derived. Then, a precisely 3DV quality model based depth characteristics is develop for the synthesized virtual views. Finally, based on D-3DV model, a multilateral filtering is applied as a pre-processed filter to reduce rendering artifacts. The experimental results evaluated by objective and subjective methods indicate that the proposed D-3DV model can reduce bit-rate of depth coding and achieve better rendering quality.

关键词： free-viewpoint television （FTV） 3D video quality model base depth maps （D-3DV） view synthesis

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Improved filtering method used for linear CCD light spot image

Improved filtering method used for linear CCD light spot ima...

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3rd International Conference on Image Analysis and Signal Processing, IASP 2011

作者： Lan, Jiming Zhang, Haiyan Xiong, Gang School of Computer Science Sichuan University of Science and Engineering Zigong China School of Science Sichuan University of Science and Engineering Zigong China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Department of Military Oil Application and Administration Logistical Engineering University Chongqing China

ISBN: (纸本)9781612848808

The light spot image of linear CCD is a kind of the representative peak signal. During filtering, it is difficult to suppress noise and preserve the peak features as much as possible. The position, amplitude, area, edge steepness of the signal peak is inevitably affected. Based on the analysis of ordinary weighted moving average (WMA) filtering algorithm, a new weight concept of amplitude and phase bivariate distance is proposed, and a kind of improved adaptive moving average (MA) filtering method, weighting this bivariate distance, is also developed. This method takes into account not only the phase correlation, but also the amplitude correlation among the sampled pixels during WMA computation. Experiments and engineering applications show that the proposed method can obtain a good result in both removing noise and preserving signal features. © 2011 IEEE.

关键词： Adaptive filtering

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Evaluating coverage quality through best covered pathes in wireless sensor networks 11

Evaluating coverage quality through best covered pathes in w...

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International Workshop on Quality of Service

作者： ShaoJie Tang XuFei Mao Xiang-Yang Li Guojun Dai Department of Computer Science Illinois Institute of Technology Chicago IL USA Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia BUPT Beijing China Institute of Computer Application Technology Hangzhou Dianzi University Hangzhou China

Coverage quality is one critical metric to evaluate the Quality of Service (QoS) provided by wireless sensor net works. In this paper, we address maximum support coverage problem (a.k.a. best case coverage) in wireless sensor networks. Most of the existing work assume that the coverage degree is 1, i.e. every point on the resultant path should fall within the sensing range of at least one sensor node. Here we study the k -coverage problem, in which every point on the resultant path is covered by at least k sensors while optimizing certain objectives. We present tackle this problem under both centralized and distributed setting. The time complexity is bounded by O(k 2 n log n) where n is the number of deployed sensor nodes. To the best of our knowledge, this is the first work that presents polynomial time algorithms that find optimal k-support paths for a general k.

关键词： Wireless sensor networks Polynomials Sensors Joining processes Euclidean distance Observability Complexity theory

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Resistive Switching Memories: Observation of Conductance Quantization in Oxide‐Based Resistive Switching Memory (Adv. Mater. 29/2012)

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Advanced Materials 2012年第29期24卷

作者： Xiaojian Zhu Wenjing Su Yiwei Liu Benlin Hu Liang Pan Wei Lu Jiandi Zhang Run‐Wei Li Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and Engineering (NIMTE) Chinese Academy of Sciences (CAS) Zhuangshi Road 519 Ningbo Zhejiang 315201 PR China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Material Technology and Engineering (NIMTE) Chinese Academy of Sciences (CAS) Zhejiang Ningbo 315201 People's Republic of China Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109 USA Department of Physics and Astronomy Louisiana State University Baton Rouge LA 70803 USA

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Study of TD-LTE Base Station Co-existence with TD-SCDMA Base Station

Study of TD-LTE Base Station Co-existence with TD-SCDMA Base...

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2011 International Conference on Advanced Materials and computer Science(ICAMCS 2011)

作者： Hong He Hong Dong Tong Yang Lin He Cong-cong Wu Tianjin Key Laboratory for Control Theory and Application in Complicated Systems Tianjin University of Technology (china) Scholl of Computer and Communication Engineering Tianjin University of Technology (china) Tianjin Mobile Communications Co. Ltd

This paper analyzes the reasons which cause the interferences between TD-LTE and TD-SCDMA systems and studies the types of interferences between the two systems in the same area. It gets the additional isolation requirements of coexistence and co-location of TD-LTE/TD-SCDMA base stations with deterministic method which bases on the minimum coupling loss. At last, some proposals for solving the interferences are given.

关键词： TD-LTE TD-SCDMA co-existence deterministic method

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Scale Parameter of Schrödinger Transform of Image

Scale Parameter of Schrödinger Transform of Image

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International Conference on Intelligent Computation and Bio-Medical Instrumentation (ICBMI)

作者： Liantang Lou Hua Zeng Wenliang Gao Lingling Li School of Science Hubei Province Key Laboratory of Intelligent Robot Wuhan Institute of Technology Wuhan China Department of Computer Science & Application ZhengZhou Institute of Aeronautical Industry Management Zhengzhou China

In the paper, scale parameter of Schrödinger transform of image is discussed. First, the experiments show Schrödinger transformation of image can be seen as the result of primitive image shrinking inside and spreading outward at the center of object, like as interference wave, and the bigger the parameter a is, the more obvious the interference is, on the other hand, contour curves of object in the transformed image are similar to contour curves of object in the original image. Then, we explain the parameter a is the scale parameter of Schrödinger transform of image. Finally, we investigate the relation between propagation distance and the scale parameter a, size of image and object.

关键词： Manganese Equations Fourier transforms Quantum mechanics Mathematical model Kernel

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A no-reference image quality evaluation based on power spectrum

A no-reference image quality evaluation based on power spect...

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3DTV Conference

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

ISBN: (纸本)9781612841618

No-reference quality evaluation is more difficult because it does not refer to any image. However, in some cases, like virtual view images, can not find the reference image, no-reference method had to be used. With the free viewpoint video technology development and application, measuring the performance of the multiview video system is essential and virtual view image quality evaluation is one of the key technologies in the system. The characteristic of virtual view image quality evaluation is that most of the virtual view images haven't reference images and can't be assessed using general measures such as PSNR of full-reference. Therefore, this paper proposed a no-reference image quality evaluation method based on image power spectrum. Experimental results show that the proposed method is consistent with PSNR.

关键词： PSNR Image quality Three dimensional displays Transform coding Mathematical model Speckle

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An improved depth map estimation for coding and view synthesis

An improved depth map estimation for coding and view synthes...

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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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Relationship classification in large scale online social networks and its impact on information propagation

Relationship classification in large scale online social net...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Shaojie Tang Jing Yuan Xufei Mao Xiang-Yang Li Wei Chen Guojun Dai Department of Computer Science Illinois Institute of Technology USA Department of Computer Science NanJing University China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications China Microsoft Research Asia China Institute of Computer Application Technology Hangzhou Dianzi University China

ISBN: (纸本)9781424499199

In this paper, we study two tightly coupled topics in online social networks (OSN): relationship classification and information propagation. The links in a social network often reflect social relationships among users. In this work, we first investigate identifying the relationships among social network users based on certain social network property and limited pre-known information. Social networks have been widely used for online marketing. A critical step is the propagation maximization by choosing a small set of seeds for marketing. Based on the social relationships learned in the first step, we show how to exploit these relationships to maximize the marketing efficacy. We evaluate our approach on large scale real-world data from Renren network, showing that the performances of our relationship classification and propagation maximization algorithm are pretty good in practice.

关键词： Social network services Labeling Communities Games Educational institutions Software Accuracy

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