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Algorithm of incorporating error detection into H.264 CABAC

机译:将错误检测纳入H.264 CABAC的算法

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CABAC is one of the main entropy coding methods in the H.264 video compression standard. As a binary arithmetic coding, CABAC can achieve extremely high compression efficiency, but it is sensitive to channel errors. After analyzing H.264 CABAC framework, an algorithm is proposed to integrate error detection into CABAC. A forbidden symbol is introduced into the coding alphabet and is allocated a small probability. Whenever this redundant interval is observed in the decoder output, an error is detected. Mathematical analysis shows that the distribution of error detection rate approximates geometric probability with the redundancy as its parameter. A small amount of extra redundancy can be very effective in detecting errors very quickly, and the compression efficiency of CABAC will not be noticeably undermined. The value of redundancy can easily be adjusted through a single parameter to suit the error characteristics of the channels in real implementations. Some useful information about the position of the error is also obtained through this error detection scheme, which can substantially improve the efficiency of succeeding error resilience processing. Experimental results confirm these conclusions.
机译:CABAC是H.264视频压缩标准中的主要熵编码方法之一。作为二进制算术编码,CABAC可以实现极高的压缩效率,但对信道错误敏感。在分析了H.264 CABAC框架之后,提出了一种将错误检测集成到CABAC中的算法。禁止符号被引入到编码字母中,并且被分配的概率很小。每当在解码器输出中观察到此冗余间隔时,都会检测到错误。数学分析表明,以冗余度为参数,检错率的分布近似于几何概率。少量的额外冗余可以非常有效地非常快速地检测错误,并且不会明显损害CABAC的压缩效率。可以通过单个参数轻松调整冗余值,以适应实际实现中通道的错误特性。通过该错误检测方案还可以获得关于错误位置的一些有用信息,这可以大大提高后续错误恢复处理的效率。实验结果证实了这些结论。

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