基于错误跟踪的时域误码掩盖算法  

Temporal Error Concealment with Error Tracking

作　　者：张明[1] 毕笃彦[1] 王勋[1] 李成[1] 

机构地区：[1]空军工程大学信号与信息处理实验室,西安710038

出　　处：《北京邮电大学学报》2007年第6期51-55,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家"863计划"项目(2006AA701121)

摘　　要：提出了一种新的时域误码掩盖算法,能更准确地恢复误码块丢失的运动矢量.为降低扩散错误的影响,在解码端利用错误跟踪理论估计每个像素的均方误差(MSE),并将MSE引入边界匹配准则,从而在估计运动矢量时充分考虑了边界像素的连续性和内部像素的可靠性.仿真结果表明,该算法在各种宏块丢失率下均优于传统的时域误码掩盖算法,具有很强的鲁棒性.A new error temporal concealment algorithm for recovering the loss or erroneously received motion vectors is presented. To alleviate the effect of transmission errors, an error tracking model is adopted to estimate the mean square error （MSE） of each pixel in the decoder. Then, the MSE is added into the boundary matching algorithm to evaluate the goodness of boundary matching and interior pixel reliability of recovered macroblocks. Simulation result shows that the proposed technique is superior to conventional temporal concealment techniques and demonstrates fairly good robustness in various lost rates of inter-coded macroblocks.

关 键 词：误码掩盖 错误跟踪 匹配准则 运动矢量 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]