H.264中整数余弦变换和周期量化的原理与分析

H.264是联合视频组正在研究制定的新一代视频压缩编码标准。H.264在它的前身H.26L的基础上进行了改进，提出了一种新的整数余弦变换方法，在降低编解码器复杂性的同时提高了编码效率。针对新整数余弦变换的特点，并考虑到H.26L中量化表的类周期性质，H.264又提出了一种新的周期量化方法。分析了H.264中这种新的整数余弦变换和周期量化的推导过程，挖掘了其扩展的可能性，最后通过在复杂度、精度和性能三个方面与H.26L中的对应算法进行比较后指出这种新算法使得H.264与H.26L相比更加简单而有效。

Theory and Analysis of Integer Cosine Transform and Periodic Quantization in H.264

H.264 is the next generation new video coding standard drafted by joint video team. Different from the former version H.26L, H.264 proposes a new integer cosine transform method to reduce the codec complexity while improving the coding efficiency. According to the characteristics of the new integer cosine transform, H.264 brings forward a new periodic quantization after considering the periodic property of the quantization table in H.26L.This paper analyzes the derivation process and the extension possibility of this new integer cosine transform and periodic quantization. By comparing the complexity,the precision requirement and the performance of this new algorithm to the corresponding algorithm in H.26L, it is found to be a key effect to bring H.264 simpler and more effective than H.26L.