基于H.264/AVC的一种改进的空域错误隐藏算法

针对视频码流在信道传输中容易出错而导致视频质量降低的问题,提出一种改进的空域错误隐藏算法。首先采用Sobel算子对丢失宏块周围四个相邻块的像素点进行边缘检测,将检测到的梯度方向量化为8个方向,然后通过边缘的方向熵自适应判断采用双线性插值法或基于边缘检测的方向加权插值错误隐藏算法。实验结果表明,该算法与参考算法相比,在不同丢包率情况下图像质量均有较明显的改善。

An Improved Spital Error Concealment Algorithm for H.264/AVC

Video stream is error-prone in channel transmission, resulting in lower video quality. This paper presents a kind of modified spatial error concealment algorithm. First, it uses Sobel operator for edge detection on pixels of the four adjacent blocks around lost macroblock and quantizes the detected gradient direction to 8 directions. Then through the adaptive judgment of edge direction entropy it uses bilinear interpolation or direction weighted interpolation error concealment algorithm based on edge detection. The experimental results show that compared with the referenced algorithms, this algorithm can improve image qualities at all conditions different packet loss probabilities.