基于码头分组的H.264变长解码算法优化

CAVLC Decoder Optimizing in H.264 Based on Dividing the Head of Code

H.264标准在编解码模块定义了一种基于内容的变长编码(CAVLC),对于实时处理来说,若该部分计算量过大,将影响整个系统的处理速度。对H.264熵解码模块进行了研究,在分析了CAVLC码表特征后,利用分组优化查表思想,提出了码头分组的快速变长熵解码方法。结果表明该方法使得H.264解码器在熵解码模块质量没有下降的情况下,速度提高了4倍以上。

For the handling of real-time,if takes much time in CAVLC , H. 264 will affect the handling of entire system speed. Based on analyzing the complexity of J MI 0.2 the code of reference decoder, it puts forward a kind of fast variable length entropy decoding method by dividing the head of code with the use of idea looked - up- by - dividing. The method has been proved to make entropy decoding four times quicker than the old one in the testing of it.