一种基于外推运动矢量的差错掩盖方法*

为了克服边框匹配算法因边框匹配不准确而导致最优运动矢量的漏选,以及差错掩盖效果明显下降的问题,提出了一种新的基于外推运动矢量的自适应时域差错掩盖算法。首先,根据宏块运动矢量的时空相关性,从相邻宏块的运动矢量及其外推运动矢量中自适应地构造出一个有限的候选运动矢量集;然后,利用边框匹配算法从构造的候选运动矢量集中选取最佳运动矢量进行差错掩盖;最后,在H.264/AVC的参考模型JM12.2中编程实现该算法。大量仿真实验结果表明,本算法可以明显降低最优运动矢量的漏选,在解码端取得了较为满意的差错掩盖效果。

Error concealment method based on extrapolation motion vectors

In order to overcome the problem of the inaccuracy of the boundary matching algorithm to lead to leakage selection of the optimal motion vector, and the effect declining of the error concealment, this paper proposed a new temporal error concealment algorithm based on extrapolation motion vectors set. Firstly, according to the temporal-spatial correlation of the motion vectors, this paper adaptively constructed a limited candidate motion vector set from neighboring macroblocks motion vectors and their extrapolation motion vectors. Secondly, it used the boundary matching algorithm to select the optimal motion vector to conceal the error from the candidate motion vectors set. Lastly, the paper realized the algorithm based on H.264/AVC JM12.2. The simulation results show that the proposed algorithm can effectively reduce the leakage selection of the optimal motion vectors, at the same time, achieve the satisfactory error concealment effect.