基于可变块运动矢量的边信息生成算法*

在分布式视频编码系统中,针对图像中细节丰富的区域易造成严重的块效应,提出了一种基于可变块运动矢量的边信息生成算法。根据前后相邻关键帧对应块的相关性,将像素块分为保留块和运动块。对保留块直接作保留处理,对运动块中的像素块继续进行分割并计算子块的初始运动矢量,最后将所有对应块的运动矢量进行加权自适应运动补偿得到改进的边信息。实验结果表明,对于运动较剧烈复杂的视频序列,该算法能够提高边信息生成质量, 并且使得改进后的边信息PSNR值提高了0.98~1.33 dB。

Side information generation algorithm based on variable#$NBSblock motion vector

Aiming at the problem that areas which have rich details can result in serious blocking effects in a distributed video coding system,this paper proposes a side information generation algorithm based on variable block motion vector.The pixel blocks are divided into preservation blocks and motion blocks according to the correlation between the blocks in adjacent key frames.The preservation blocks are directly retained, and the pixel blocks existed in the motion blocks are continued to divide and its initial motion vectors of the sub-blocks are calculated.At last,in order to get improved side information,it uses the method of weighted adaptive motion compensation to process all the motion vectors of corresponding blocks.The experimental results show that, for the video sequence is severely complex, this algorithm can improve the quality of the side information generation and the PSNR of the improved method proposed in this paper can increase by 0.98~1.33 dB.