摘要： 针对无线信道传输视频信号易发生丢包的现象,提出基于H.264/AVC的自适应时空错误隐藏算法。依据场景是否发生变化自适应选择空域错误隐藏或时域错误隐藏。时域错误隐藏采用时空结合边界匹配法,保持平滑性和结构相似性。空域错误隐藏采用多方向插值法,恢复主要边缘后沿每个主导边缘方向插值得到近似值,并利用加权平均法恢复像素值。实验结果表明,与Motion Copy,JM10.2,Kung算法相比,该算法具有较好的隐藏效果和图像质量。

关键词: 时空域错误隐藏, 多方向插值, 边界匹配法, 自适应, 场景

Abstract: It is prone to lose pocket when audio and video stream transfers in wireless channels.An adaptive temporal-spatial domain error concealment scheme based on H.264/AVC is proposed.It can adaptively select the temporal error concealment or spatial error concealment according to the change of scenes.Temporal concealment adopts temporal-spatial domain boundary matching algorithm which preserves smoothness properties and structural similarity.Spatial error concealment makes use of multi directional interpolation which is performed in three steps.First,significant edges are recovered.Second,based on the predicted significant directions,an approximation is obtained for each missing pixel.Finally,weighted average algorithm is made use to recover each pixel.Experimental results show that the technique can effectively enhance the performance of error concealment and image quality when compared with Motion Copy,JM10.2 and kung algorithms.

Key words: temporal-spatial domain error concealment, multi directional interpolation, Boundary Matching Algorithm(BMA), self-adaptation, scene

中图分类号: 

• TN919.81