基于无线环境的错误隐藏算法  

Error Concealment Algorithm in Wireless Networks

作　　者：魏聪颖[1] 牛建伟[1] 胡建平[1] 吉海星[1] 

机构地区：[1]北京航空航天大学计算机学院,北京100083

出　　处：《计算机工程》2008年第2期220-222,共3页Computer Engineering

基　　金：国家自然科学基金资助项目(90612004)

摘　　要：在无线环境下压缩的视频序列对信道干扰非常敏感。传输错误不仅会影响当前帧而且会扩散到后续各帧。目前大多数利用时间和空间冗余特性的后处理错误隐藏方法并不能有效地对这种传输错误进行修复,它们忽视了被修复宏块的邻居宏块在无线环境下极易丢失这个事实,仅在当前帧中进行错误隐藏,因而限制了修复的效果。该文提出一种适用于无线环境的错误隐藏算法,该算法计算量较小,在当前帧和后续的B帧和P帧中都可达到较佳的图像质量。仿真结果证明,在无线环境下,该算法在图像质量和计算负载方面都是一种较优的错误隐藏方法。Compressed video sequences are very vulnerable to channel disturbances when transmitted through the burst-packet-loss wireless channels. Transmission errors corrupt the current frame and also propagate to successive frames. However, such errors can not be retrieved properly with existing post-processing concealment method, thus, this paper proposes a novel one for video transmissions in wireless environment. The method enjoys low computational costs and achieves acceptable image quality both in the current decoded frame and in the successive frames B and P. Simulation results prove that the proposed algorithm can be chosen as good trade-off between video quality and computational load in wireless networks.

关 键 词：错误隐藏 边界匹配算法 运动跟踪 多帧处理 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]