【作者】 陈亚菲；

【导师】 陈生潭；

【作者基本信息】 西安电子科技大学 ， 信号与信息处理， 2007， 硕士

【摘要】 视频编解码以其贴近人们日常生活而成为众多学者研究的目标,H.264/AVC标准代表了国际编解码标准的最新技术和更优越的性能。我国也在2006年推出了首个具有自主知识产权的标准AVS。块效应是视频编码中影响编码质量的一个重要问题,特别在低码率情况下尤为明显。本文在深入研究视频编码技术的基本理论、算法和国际标准的基础上,剖析了图像编码领域中块效应的产生原因和消除方法,针对H.264/AVC标准中块效应产生机理、检测策略和抑制算法提出了块滤波改进算法,并设计仿真实验,结果表明,改进算法与H.264/AVC相比,在基本不增加计算复杂度的前提下,图像客观质量平均提高0.16dB。同时讨论了并行计算方法在视频编解码中应用的可行性和有效性。最后对代码优化和并行计算等若干问题提出初步研究设想。更多还原

【Abstract】 Block artifact is one of major causations which reduce the quality of pictures in video coding, especially at the time of low bit rate. The method to reduce block artifact in international standard H.264/AVC is demonstrated, and the possibility to include parallel computation is analyzed.Coding and Decoding (Codec) standards are hot research objects since they are so close to human in normal life for information, entertainment and commercial activity. As is known, H.26x and MPEG-x standards are very popularly worldwide. The latest international standard H.264/AVC has been issued and makes our lives more colorful because of its better performances than those old Codec standards.China has established the first national audio and video coding standard (AVS) just after H.264/AVC, this takes the new situation to all Chinese local developers with self-owned intellectual property.An overview of the international standards relative to Codec is given in this dissertation firstly, then the generation reason of block artifact, the check method, the reduction strategy and test experiments. After comparing and studying de-blocking filter algorithms in nowadays Codec standards, a suggestion to improve deblocking filters is described and tested in software programming way. To keep almost the same complexity as the standard H.264/AVC, more 0.16dB of PSNR is obtained after filtering block artifacts in frames. Parallel computation is discussed in order to modify loop or switch operation times in deblocking filter programs.Lastly the thesis draws a conclusion and points out the on-going future research directions.更多还原