摘要
为了减小视频传输中的错误对解码端重建视频质量的影响,提出了一套结合时空域差错隐藏算法的方案。针对错误宏块在视频图像中呈随机分布的情况,首先将编码端帧内预测编码的思想引入到解码端,提出了一种方向性插值的空域差错隐藏算法;然后提出了一种基于8×8块的增强型时域差错隐藏算法来改善运动剧烈区域的质量;最后,提出了一种根据相邻宏块编码模式来选择时域或空域差错隐藏算法的切换策略。实验证明,提出的差错隐藏方案无论是在客观质量上,还是在主观质量上,都优于H.264/AVC的效果。
In order to reduce the influence of transmission errors on the reconstructed image quality in decoder, a novel spatio-temporal error concealment scheme was proposed. A hypothesis was made that the corrupted macro blocks （MB） distributed randomly in the frame which is sufficiently realistic and extensively used in literature. Firstly a directional interpolation based spatial error concealment algorithm was used which introduces a method similar with the intra prediction in the encoder. Then an 8x8 block based enhanced temporal error concealment algorithm was proposed, which improved the ability to deal with the high motions areas. Finally, a switch strategy between spatial and temporal error concealment algorithm was addresse. It chooses an appropriate algorithm based on the adjacent MB coding modes. Experimental results demonstrate that the proposed scheme is prior to the algorithms in H.264/AVC both in objective and subjective quality.
出处
《通信学报》
EI
CSCD
北大核心
2007年第4期72-79,86,共9页
Journal on Communications
基金
国家自然科学基金资助项目(60572063)
华中科技大学校科学研究基金资助项目(2006M008B)~~
关键词
差错隐藏
空域隐藏
时域隐藏
切换策略
error concealment
spatio concealment
temporal concealment
switch strategy
