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1、南京邮电大学 硕士学位论文 无线多媒体传感器网络视频压缩算法研究 姓名：马子平 申请学位级别：硕士 专业：计算机应用技术 指导教师：孙力娟 2011-03 南京邮电大学硕士研究生学位论文中 文 摘 要 I 中中 文文 摘摘 要要 随着无线多媒体通信技术的飞速发展，出现了越来越多的视频应用需求。这些应用所 产生的视频数据量巨大，而视频压缩可以降低多媒体传感器网络中的数据信息量。在无线 多媒体传感器网络的视频应用中，由于终端节点处理能力和网络资源有限，需要较低复杂 度的编码。传统的视频编码标准(如 H.26x、MPEG-x)都采用了混合编码框架，编码采用运 动补偿技术，编码复杂度是解码复杂度的 5
2、10 倍。鉴于此，传统视频压缩标准难以在无 线多媒体传感器网络上直接高效的应用，如何有效的利用宝贵的传感器网络资源，怎样对 多媒体信息进行高效的压缩已经成为当前研究的热点问题。 本文在详细介绍分布式视频编码的基础上，对 Wyner-Ziv 视频编码进行了深入研究和 探讨。传统 Wyner-Ziv 视频编码方案采用区域统一编码，可能导致运动剧烈区域解码估计 的失真问题。本文提出一种基于感兴趣区域提取的分布式视频编码算法。该算法基于图像 梯度场，针对 Wyner-Ziv 帧不能准确编解码的区域，通过感兴趣区域判定准则提取该区域 并基于熵编码压缩，图像的其它区域则基于 LDPC 实现分布式编解码。为
3、了进一步提高解 码图像质量，基于空域进行图像后处理，采用去块效应和去振铃效应滤波处理。仿真实验 表明：本文算法可增强运动剧烈区域的编码效率，在降低码率的同时提高解码图像质量， 最终降低传感器节点能耗。 关键词：分布式视频编码，感兴趣区域，图像后处理，无线多媒体传感器网络 南京邮电大学硕士研究生学位论文ABSTRACT II ABSTRACTABSTRACTABSTRACTABSTRACT As the wireless multimedia communications technology develops rapidly, there are more and more video app
4、lications. Huge video data are produced in these applications; video compression can reduce the amount of data information in multimedia sensor networks. In the video application of wireless multimedia sensor networks, because the terminal nodesprocess abilities and networks resources all limited, i
5、t needs to code in lower complexity. Traditional video coding standards (such as H.26x, MPEG-x) all adopt mixed coding framework, encoder using motion compensation，the encoding complexity is 5 to 10 times than decoding. Because of this, it is difficult to use traditional video coding standards on wi
6、reless multimedia sensor networks. How to make efficient use of precious wireless multimedia sensor networks resources and how to compress the multimedia information efficiently have already become the hotspots of the current study. Based on the detailed introduction about distributed video coding,
7、this thesis makes further study and discussion on the Wyner-Ziv video coding. Transitional Wyner-Ziv video coding scheme adopting regional unified coding, may lead to the distortion problem of decoding estimation of the intense motion region. This thesis proposes an algorithm which based on region o
8、f interest extraction for distributed video coding. The algorithm is based on image gradient field. For the regions of the Wyner-Ziv frame which are cannot coding and decoding accurately, the algorithm extracts such regions according to the criteria of region of interest, then compresses based on en
9、tropy coding, however, other regions which are encoding and decoding based on LDPC.Tofurther improve the quality of decoded image, image post-processing based on spatial, using de-block effect and de-ring effect on the decoded image. Simulation results show that: the proposed algorithm can enhance t
10、he encoding efficiency of the intense motion region; the algorithm can also reduce the rate and improve the quality of decoded image, and decrease the energy consumption of sensor nodes ultimately. KeyKeyKeyKey words:words:words:words:Distributed Video Coding, Region of Interest, Image Post-processi
11、ng, Wireless Multimedia Sensor Networks 南京邮电大学硕士研究生学位论文缩略词 58 缩略词缩略词 缩略词英文全称译文 ADSLADSLADSLADSLAsymmetric Digital Subscriber Line非对称数字用户环路 CRCCRCCRCCRCCyclic Redundancy Check循环冗余校验 DCTDCTDCTDCTDiscrete Cosine Transform离散余弦变换 DSCDSCDSCDSCDistributed Source Coding分布式信源编码 DVCDVCDVCDVCDistributed Video
12、Coding分布式视频编码 DWTDWTDWTDWTDiscrete Wavelet Transform离散小波变换 GOPGOPGOPGOPGroup of Pictures图片组 IDCTIDCTIDCTIDCTInverse Discrete Cosine Transform反余弦变换 IEEEIEEEIEEEIEEE InstituteforElectricalandElectronic Engineers 电气和电子工程师学会 JPEGJPEGJPEGJPEGJoint Photographic Experts Group联合图像专家组 JVTJVTJVTJVTJoint Video
13、 Team联合视频专家组 LDPCLDPCLDPCLDPCLow Density Parity Check Code低密度奇偶校验码 LSBPLSBPLSBPLSBPLeast Significant Bits Planes最低有效位平面 MDVCMDVCMDVCMDVCMultiview Distributed Video Coding多视角分布式视频编码 MPEGMPEGMPEGMPEGMotion Picture Experts Group运动图像专家组 MMMMSBPSBPSBPSBPMost Significant Bits Planes最高有效位平面 MSEMSEMSEMSEMea
14、n Square Error均方根误差 NSQNSQNSQNSQNested Scalar Quantization嵌套标量量化 PRISMPRISMPRISMPRISM Power-efficient Robust high-compression Syndrome-base Multimedia 能量有效鲁棒的高压缩 率同步多媒体 PSNRPSNRPSNRPSNRPeak Signal to Noise Ratio峰值信噪比 QoSQoSQoSQoSQuality of Service服务质量 RCPTRCPTRCPTRCPTrate compatible punctured turbo
15、code码率自适应打孔 turbo 码 ROIROIROIROIRegion of Interest兴趣区域 南京邮电大学硕士研究生学位论文缩略词 59 SISISISISide Information边信息 VCEGVCEGVCEGVCEGVideo Coding Experts Group视频编码专家组 VLCVLCVLCVLCVariable Length Coding变换长度编码 WMSNsWMSNsWMSNsWMSNsWireless Multimedia Sensor Networks无线多媒体传感器网络 WSCWSCWSCWSCWavelet Syndrome Coding小波变换的综合编码 WSNsWSNsWSNsWSNsWireless Sensor Networks无线传感器网络 南京邮电大学硕士研究生学位论文图表清单 60 图表清单图表清单 图 1-1 基于分布式视频编码和传统视频编码的无线视频通信网络框架.2 图 2-1 一个无线多媒体传感器网络参考体系结构.6 图 3-1 Slepian-Wolf 理论对于两个统计相关信源 X 和 Y 分布式压缩的码率界限.20 图 3-2 使用统计相关边信息 Y 对 X 进行压缩.20 图 3-3 使用统计相关边信息 Y 对信源 X 进行有损压缩.
