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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Jin-Xia Yu Yong-Li Tang Wen-Jing Liu College of Computer Science and Technology Henan Polytechnic University Jiaozuo China Jiangsu Provincial Key Laboratory of Image Processing and Image Communication Nanjing University of Posts and Telecommunications Nanjing China Department of Computer Science and Technology Tsinghua University Beijing China

Aimed at the deficiency of the resampling algorithm in PF, diversity measures ESS (effective sample size) and PDF (population diversity factor) are evaluated respectively. Combined with the estimation result, diversity measures PDF is used for adaptively tuning the resampling threshold. By integrating the operation of particle mutation after resampling into PF and using the above mechanism of diversity guidance, the AMPF algorithm (Adaptive Mutation PF) is presented so as to assure the diversity of particle sets. With the simulation program using matlab 7.0 to track a single target motion from a fixed visual observation points, the performance of diversity measures and AMPF are evaluated and the validity of the proposed method is verified.

关键词： Particle measurements Atmospheric measurements Particle filters Algorithm design and analysis Mathematical model Tuning Estimation

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Fuzzy reasoning based temporal error concealment

Fuzzy reasoning based temporal error concealment

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6th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2009

作者： Zhan, Xuefeng Zhu, Xiuchang Nanjing University of Posts and Telecommunications Image Processing and Image Communication Lab. Nanjing China

ISBN: (纸本)9780769537351

A novel temporal error concealment based on fuzzy reasoning is proposed in this paper. On temporal error concealment, motion vector (MV) of the lost block can be selected from candidate MVs. Generally, side match distortion (SMD) which reflects the continuity across the boundary and sum of absolute difference (SAD) which shows the degree of similarity of matching area are two widely used criterions to make the decision. Each criterion describes the status partly. Combining these two measures, a refined measure based on fuzzy reasoning is calculated to balance the effects of SMD and SAD. According to the experimental results, our method can perform better than the others. © 2009 IEEE.

关键词： Errors

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Refined spatial error concealment with directional entropy

Refined spatial error concealment with directional entropy

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5th International Conference on Wireless communications, Networking and Mobile Computing, WiCOM 2009

作者： Xuefeng, Zhan Xiuchang, Zhu Image Processing and Image Communication Lab. Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781424436934

A refined error concealment method for intra frame in H.264 is proposed in this work. Directional entropy of neighboring edges is used to classify the content of the lost block. Some techniques aimed to shorten the computation time without degrading quality of reconstructed video are presented to enforce multi-directional interpolation. As for block with high texture, either bilinear or multi-directional interpolation alone is not so well to recover, we integrate the two methods to get the final result. Experimental results demonstrate the efficiency and better performance of proposed method as compared to other interpolation based methods. ©2009 IEEE.

关键词： Interpolation

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Multi-stage frame error concealment algorithm for H.264/AVC based on estimated MB feature

Multi-stage frame error concealment algorithm for H.264/AVC ...

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5th International Conference on Wireless communications, Networking and Mobile Computing, WiCOM 2009

作者： Ziguan, Cui Xiuchang, Zhu Image Processing and Image Communication Lab. Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781424436934

This paper proposes a novel multi-stage frame error concealment (EC) algorithm for H.264/AVC based on estimated MB modes and MVs. The proposed method first divides the lost frame into three regions according to MB features in previous frame: which are regular motion region within the object and background, irregular motion region mainly including border areas between various parts of moving object and background, and intra-coded MB region. Then we recover the three regions sequentially by utilizing suitable schemes, motion vector copy method for regular motion region, improved optical flow based method for irregular motion region, and bilinear interpolation (BI) or directional interpolation (DI) method for intra-coded MB region. Experimental results show that our proposed adaptive algorithm can effectively utilize the advantages of classic methods and obtain better recovery performance both in subjective and objective video quality at low computational complexity, and our method effectively prevents the error propagation in the following frames and thus improves the reconstruction quality of the entire video sequence. ©2009 IEEE.

关键词： Adaptive algorithms

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Motion vector recovery for H.264 based on mean shift

Motion vector recovery for H.264 based on mean shift

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2009 15th Asia-Pacific Conference on communications, APCC 2009

作者： Zhan, Xuefeng Zhu, Xiuchang Nanjing University of Posts and Telecommunications Image Processing and Image Communication Lab. Nanjing 210003 China

ISBN: (纸本)9781424447855

In this paper, we describe a novel motion vector (MV) recovery method for H.264 which is based on mean shift procedure. In H.264, macroblock (MB) can be divided into several 4x4 blocks. Generally, MVs of these blocks in local region are very similar. To conceal the lost MB temporally, we consider the MV recovery of the lost MB as smooth operation in the neighboring area. The mean shift procedure is applied here to estimate MVs of lost blocks. Experimental results demonstrate their better performance. ©2009 IEEE.

关键词： Recovery

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Error concealment for stereoscopic images using boundary smooth degree

Error concealment for stereoscopic images using boundary smo...

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2009 15th Asia-Pacific Conference on communications, APCC 2009

作者： Tang, Guijin Zhu, Xiuchang Jiangsu Key Lab of Image Processing and Image Communication Nanjing University of Posts and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781424447855

Error concealment can be regarded as a sort of error resilient coding techniques. This paper proposes a method to recover lost blocks in stereoscopic images. We first utilize the correlation to perform disparity estimation to match the corresponding blocks for lost ones. And then we calculate the boundary smooth degree (BSD) for each recovered block. If BSD exceeds the threshold, it means that the boundary is discontinuous which mainly results from high detailed blocks, edge blocks or occluded blocks. So we consider neighboring blocks' BSD and estimate the content of a lost block, and adaptively use different methods to conceal it. Experimental results show that the proposed algorithm can greatly improve the subjective and objective quality of the reconstructed image. ©2009 IEEE.

关键词： Errors

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Technical Analysis on Application Layer Error Control in IPTV

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ZTE communications 2010年第1期000卷

作者： Xia Hongfei Lü Xiaopeng Liu Feng ZTE Corporation Nanjing 210012P.R.China Image Processing and Image Communication Laboratory of Jiangsu Province Nanjing University of Posts and TelecommunicationsNanjing 210003P. R. China

When they provide Internet Protocol Television (IPTV) services, IP networks face difficulties such as reduced transmission bandwidth, delay, jitter, and packet loss. A terminal-centric solution can improve the image quality by adding control policies like congestion control and error control to the receiving terminal and source code. An end-to-end application layer reliability method is usually required to satisfy IPTV requirements in the IP network. Application Layer Forward Error Correction (AL-FEC) technology solves the problem of packet loss, and can ensure the end-to-end reliability for IPTV services.

关键词：差错控制分析应用 IPTV 技术接收终端 IP网络服务终端互联网协议

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Motion vector recovery for H.264 based on mean shift

Motion vector recovery for H.264 based on mean shift

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Asia-Pacific Conference on communications

作者： Xuefeng Zhan Xiuchang Zhu Image Processing and Image Communication Laboratory Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781424447848

In this paper, we describe a novel motion vector (MV) recovery method for H.264 which is based on mean shift procedure. In H.264, macroblock (MB) can be divided into several 4×4 blocks. Generally, MVs of these blocks in local region are very similar. To conceal the lost MB temporally, we consider the MV recovery of the lost MB as smooth operation in the neighboring area. The mean shift procedure is applied here to estimate MVs of lost blocks. Experimental results demonstrate their better performance.

关键词： Kernel Interpolation Error correction Partitioning algorithms Motion estimation Video compression Clustering algorithms image processing image communication Lagrangian functions

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image complexity adaptive intra-frame rate control algorithm for H.264/AVC

Image complexity adaptive intra-frame rate control algorithm...

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International Conference on Wireless communications and Signal processing (WCSP)

作者： Ziguan Cui Xiuchang Zhu Image Processing and Image Communication Laboratory Nanjing University of Posts and Telecommunications Nanjing China

Aiming at the bad effect of intra-frame rate control (RC) of H.264, this paper proposed an image complexity adaptive intra-frame RC algorithm. First, in order to acquire intra-frame coding complexity more accurately, our algorithm analyzes intraframe by Sobel operator and establishes edge direction histogram for each 4×4 block, then gets the most probable intra prediction mode and corresponding reconstructed blocks, finally obtains the residual picture which is close to the actual coding residual. The mean absolute value of residual picture was used to represent the intra-frame coding complexity, combined with our empirical rate-quantization (R-Q) model and target bits allocation method from exhaustive experiments, and the intra QP was determined accurately. Extensive experimental results show that our algorithm not only obtains more accurate intra-frame output bitrate, more consistent subjective quality and more steady PSNR fluctuation compared with existing algorithm, but also prevents buffer overflow and frame skip effectively.

关键词： Programmable control Adaptive control Automatic voltage control Bit rate Radio control Algorithm design and analysis Histograms image reconstruction Quadratic programming PSNR

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Fuzzy Reasoning Based Temporal Error Concealment

Fuzzy Reasoning Based Temporal Error Concealment

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Xuefeng Zhan Xiuchang Zhu Image Processing and Image Communication Laboratory Nanjing University of Posts and Telecommunications Nanjing China

关键词： Fuzzy reasoning Distortion measurement Interpolation Decoding Motion estimation Fuzzy systems image processing image communication image coding Motion compensation

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