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H.264视频压缩关键技术的研究与应用
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摘要
随着无线通信技术的发展,无线网络视频传输已成为多媒体领域和无线通信领域关注的焦点,无线网络视频监控系统也将被广泛应用。其中的关键技术——图像压缩技术己经成为电视广播、视频监控和多媒体娱乐等中最重要的一部分。由ITU-T VCEG和ISO/IEC MPEG联合组成的JVT开发的H.264/MPEG 14496-10 AVC(文中后面将统一称其为H.264)是最新一代的视频压缩标准,也是目前图像通信领域研究的热点。本文对H.264标准进行了系统深入的分析,并对新标准的性能进行了仿真实验;对最耗时模块之一的块匹配运动估计快速搜索算法进行了改进,并针对无线信道特点给出了H.264在抗误码方面的技术,最后给出了基于H.264标准的网络视频监控系统的实验演示平台。
     论文的主要内容如下:
     一、综述了课题的研究背景、视频压缩的意义、目的以及压缩的可行性,分析了目前国内外在该领域的研究现状,阐述了本论文所研究的无线网络视频监控系统的一些关键技术。对H.264标准进行了系统深入的分析,总结出了H.264标准区别于以往标准的新技术。
     二、对最耗时模块之一块匹配运动估计的现有各种搜索算法进行了深入分析,在此基础之上提出了一种改进的快速运动估计搜索算法,并对新算法的有效性进行了实验验证。
     三、对网络传输中误码产生原因以及其对网络视频传输的影响进行了简要的分析,在分析常用的一些抗误码技术的基础上,深入分析了最新一代的视频压缩标准H.264应用在网络传输抗误码中的一些最新技术;对新标准的抗误码性能进行了仿真实验。
     四、对网络视频监控的软件进行了详细设计,并在此基础上,采用UDP协议在局域网上开发了基于H.264标准的网络视频监控演示平台。
With the development of wireless network technology, wireless video transmission has become the focus in both of the wireless communication and the multimedia fields and has been widely applied to wireless Video surveillance. Its key technology--Video compression has become the most important part of television broadcasting, video surveillance and multimedia entertainment. The H.264/MPEG 14496-10 AVC (H.264) made up of ITU-T VCEG and ISO/IEC MPEG is the latest generation standard of video compression. By investigating the H.264 detailed, this thesis improve the search algorithm of fast motion estimate, which is one of the most time-consuming modules, then we present the technology of error resilience for wireless communication. Finally, we provide the experiment platform of the network video surveillance system based on H.264 standard. The major contributions of this thesis list as follow:
     1. Analyze particular the development of the video compression, describe the research background, the purpose and the feasibility of thesis, and the main technologies about the wireless network video surveillance system; Investigate detailed the performance of the H.264 standard and its new technologies different from the previous standard.
     2. By researching the fast motion estimate search algorithm, which is one of the most time-consuming modules, this thesis presents an improved fast motion estimate search algorithm. The performance of the new algorithm is proved by simulation experiments.
     3. Briefly analyze the causes of the network transmission error and its impact to network video transmission. Based on analyzing traditional error resilience technology, this thesis researches the new technology of the H.264 standard used in the network transmission error resilience. The performance of H.264 standard is proved by simulation experiments.
     4. Based on detail design to the network video surveillance software, this thesis develops a network video surveillance demonstration platform based LAN using H.264 standard and UDP protocol.
引文
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