一种改进的CAVLC解码优化算法

An Improved Decoding Algorithm of CAVLC

对于基于上下文的自适应可变长编码(CAVLC)解码方案,提出一种快速解码方法,基本原则:分析非结构化码表的相关性,对码字进行多层次分级分组,采用前导0个数判断法,用简单的加法操作代替非常耗时的查表操作。基于以上基本原则进行算法各个方面的优化和改进,结果表明,降低了一定的存储空间,明显提高了解码速度。

This paper proposes a fast decoding method for CAVLC,the basic idea,including：Analyzing the relevance of unstructured code table;Establishing grouping-and-grading model;Using a leading 0 numbers of judgments law;With a simple addition operation to replace a very time-consuming look-up table operation.Based on the four principles above,the results show that the methods can reduce the memory and increase the decoding speed.