H.264/AVC 中的算术码及其改进方法Arithmetic coding and Its Im

本文首先分析 H.264/AVC 中CABAC 的主要过程，随后介绍了两种提高编码效率的

改进方法，然后提出了一种新的提高编码速度的算术码快速算法。实验结果表明，本文提出的快速算法在编码效率没有明显降低的条件下，其编码速度有一定的提高，同时也不需要存储空间，从而比较适用于对实时性和存储空间要求高的场合。

[关键字] 基于上下文的自适应二进制算术码；运动矢量差值； 快速算术码

[Abstract] This article analyses the main process of CABAC in H.264/AVC at first, then

introduces two existing ways of improving coding efficiency. Finally, we propose a new fast

arithmetic algorithm to enhance coding speed. The experiment shows that without decreasing

coding efficiency a lot, this fast arithmetic algorithm can improve coding speed to some extent as well as saving memory, so it is more likely to be used in scenes of having more real time

requirements and less memory。

[Key words] CABAC; MVD; fast arithmetic coding