基于无线网络的H.264误码掩盖算法的改进  

Improved Error Concealment Algorithm for H.264 Wireless Networks

作　　者：侯艳艳[1] 

机构地区：[1]枣庄学院计算机科学系,山东枣庄277160

出　　处：《电视技术》2011年第13期9-11,34,共4页Video Engineering

基　　金：枣庄市科学技术发展计划项目(200925-3)

摘　　要：视频压缩码流在无线网络传输过程中受无线网络环境的影响丢包现象严重,重构图像质量下降。在H.264时域误码掩盖算法的基础上,根据时域和空域相邻宏块的运动矢量对丢失宏块的分割模式进行自适应选择,采用改进的边界匹配误差函数,估计丢失宏块的运动矢量。在无线网络环境下对多种视频序列和宏块丢失率进行仿真,图像质量有一定的提高。在宏块丢失率为10%情况下,峰值信噪比相对H.264标准算法提高0.08～1.13dB。The compressed video stream will be corrupted because of the serious wireless network packet loss, which may degrade the reconstructed image quality. In this paper, an adaptive selection MB mode for the lost MB is presented based on the temporal and spatial neighboring motion vectors, and an improved boundary match error function is adopted to estimate lost MB motion vectors. Simulation results show that the proposed method yields better video quality for a variety of video sequences and different MB loss rate in the wireless transmission environment. The peak signal to noise ratio is improved 0.08- 1.13 dB over the traditional H.264 algorithm when MB loss rate is 10%.

关 键 词：错误隐藏 边界匹配算法 运动矢量 宏块模式 

分 类 号：TN919.8[电子电信—通信与信息系统]