H．264在无线网络中的可靠传输  

Robust coding scheme for H.264 video transmission over wireless network

作　　者：李平[1] 唐昆[1] 李程杰[2] 

机构地区：[1]清华大学电子工程系,北京100084 [2]北京理工大学宇航科学技术学院,北京100081

出　　处：《计算机应用研究》2008年第4期1207-1210,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(60572018)

摘　　要：提出了一种基于数据分割和不等错误保护的H．264在无线网络中可靠传输的新方法。通过引入帧间宏块（MB）影响因子和γ曲线，方法根据C型数据对错误传播影响的程度进一步将其划分为几个子型；然后对A、B和C型数据提供不等错误保护，应用基于不等错误保护的率分配模型和基于迭代改进的双向局部搜索算法。仿真结果表明，该方法比传统H．264编码方法可以得到更好的性能（约0．2～0．6dB的PSNR增益）。随着丢包率的增加，该方法提供更加平稳的重建视频质量。Based on the application of data partitioning and unequal error protection, a new robust coding scheme was proposed for H. 264 video transmission over wireless network. The influence factor of inter MB and γ curve was introduced. According to their effects to error propagation, the C type partition was further divided into some subtypes. Then unequal error protection was given to all partitions which include A, B and C types. The model of rate allocation and an iteratively improved bidirectional local search algorithm were also presented. The simulation results show that the proposed method is robust to packet loss and superior to the conventional H. 264 coding and can obtain about 0.2 -0.6 dB＇ s gain in PSNR.

关 键 词：H.264 数据分割 不等错误保护 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]