移动P2P环境下基于时空混合多描述编码的H.264编码器优化算法  

H.264 optimization algorithm though combining advantage of time interpolation MDC and spatial interpolation MDC under wireless P2P network

作　　者：姚建盛[1] 王胜华[2] 周玲[3] 刘艳玲[4] 常群[2] 

机构地区：[1]吉林师范大学计算机学院,长春130022 [2]北京航空航天大学计算机学院,北京100083 [3]北京航空航天大学软件学院,北京100083 [4]长春理工大学计算机学院,长春130022

出　　处：《计算机应用研究》2010年第7期2792-2794,共3页Application Research of Computers

摘　　要：目前,很多改进多描述编码(multiple description coding,MDC)的算法大多把重点放在减少冗余以及码字在各个描述的合理分配上,而忽略了数据中包含的信息量以及对编/解码器恢复图像时的重要程度。针对上述问题以及时间插值的MDC方案和空间插值的MDC方案各自的优缺点,设计了一个基于信息度优化的时空混合多描述编码的方案,该方案充分利用了H.264编/解码器的特点,预先估计出各帧数据中对恢复图像的作用比,再利用不同级别的时空混合编码方案使多描述编码的码率分配更加合理。实验证明,在码率相差不大的前提下,其显著提高了丢失描述情况下视频的恢复质量。At present,many improved MDC algorithms mostly focus on reducing the redundancy,as well as reasonably distributing of bits on every description,but ignore the amount of information the data contains and the effect for the restoring the vedio.In view of the above problems,this article designed one optimized algorithm though combining both the advantage of time interpolation MDC and spatial interpolation MDC,and also making full use of the characteristic of H.264 codec to preestimate the effect of the frame for restoring the vedio,then used different level MDC to make bit-rate allocation more reasonable.The experiment results show that the proposed algorithm can improve in restoring the transmitted vedio significantly with bits rate basicly no change.

关 键 词：对等网 时空混合 多描述编码 H.264 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]