时空域相结合的视频差错掩盖方法

摘要

为了克服视频解码端时域差错掩盖技术不能准确估计丢失块运动矢量的缺点,提出了一种将解码端运动估计和隐藏运动模型相结合的误码差错掩盖方法.首先,利用丢失块周围正确接收像素估计丢失块运动矢量,并计算估计的准确性.然后根据准确性,通过隐藏运动模型充分利用丢失块的空域和时域相关性进行差错块的掩盖.仿真结果表明,与现有的算法相比,该方法能有效提高重建视频图像质量平均近1 dB.%To overcome the shortcomings of temporal error concealment techniques in decoder that can not estimate motion vector of the loss block accurately, motion estimation in decoder and implicit motion model combined error concealment scheme is presented.First of all, we utilize the survived surrounding pixels of lost block for motion estimation, and determining the accuracy of estimates.Then we restore the missing pixels with implicit motion model making full use of the relevance of temporal and spatial domain according to the accuracy.The simulation results show that this method can improve the video image quality by 1 dB than other methods.