【作者】 陈玉； 张旭东； 王德生；

【Author】 CHEN Yu,ZHANG Xu-dong,WANG De-sheng (Department of Electronic Engineering,Tsinghua University,Beijing 100084,China)

【机构】 清华大学电子工程系；

【摘要】 提出了一种用于提高视频流Ⅰ帧的容错能力的方法。该方法首先对视频流中不同部分对发生在自身的码位错误所引起误差传播的敏感度进行分析,以此结果来决定Ⅰ帧码流中重要信息,并对这些重要信息加以集中以减少发生帧内误差传播范围。同时为每个宏块的CBP位插入少量的校验信息作为重同步标记和视频流错误检测标记。这样就大大缩小了误差传播的传播范围。通过H.263+baseline测试码流在加性高斯白噪声无线信道仿真实验的结果可以证明:该算法在增加少量冗余信息和计算复杂度的情况下,相比参考算法在主观和客观质量上都有较大幅度的提高。更多还原

【Abstract】 One method is proposed to improve robustness of intra-coded frame in wireless transmission,it firstly analyzs the sensitivity to error propagation of different segment in video stream when there are channel bit errors.And then with this analysis results,important information for wireless intra coded frame communication is determined,which is then aggregated to mitigate the extent of error propagation inside frame.Meanwhile,few verification bits are added into video stream for CBP bits of each macro-block as resynchronization mode and error detection mode,which can further reduce the effect of error propagation. Experiment on H.263+baseline tested stream through addictive Gauss white noise wireless channel,the proposed method outperforms reference method in subjective and objective quality obviously with little increasing of coding overhead and computation.更多还原