Information from the trellis state of the VLC encoding is incorporated into the generation of the parity bits, so that the VLC encoding trellis path is more heavily protected and the error propagation is reduced.
由于变长编码所固有的易于误码扩散的弱点,传统的纠错编码并不能高效地解决变长编码的差错控制问题。
263++ and MPEG 4 because of their ability to prevent error propagations.
可逆变长码以其出色的抗误码扩散的能力而被近来的视频压缩标准 (H。
264,introduces temporal information between frames for Ⅰ frame concealment after scene change detection,and prevents error propagation by block reliability checking.
264中灵活宏块顺序模式组织宏块打包数据,在场景判断的基础上利用了帧间信息对Ⅰ帧进行时域差错隐藏,并通过对匹配块的可靠性检测抑制了误码扩散效应;同时改进了传统Ⅰ帧空域隐藏算法,根据丢失块边缘上的梯度预测丢失块的纹理状况,分为平滑、单纹理和多纹理区域进行掩盖。
Analysis of the error resiliency of variable length codes;
变长码的抗误码扩散能力分析
In this paper,based on the discrete memoryless source model,the error resiliency of variable length codes(VLC) is analyzed.
基于离散无记忆信源模型,分析了变长码的抗误码扩散概率。
These methods are described in four categories:forward error control combined with the characteristics of video signals,bitstreams transcodec,error concealment and error-propagation prevention.
首先 ,详细评述了结合信源特点的前向差错控制、码流变换、解码端的误码掩盖和防误码扩散等视频抗误码新方法 ;然后 ,介绍视频编码标准H 。