视频编码中算术编码的二进制化研究  

A Novel Binarization Scheme in Arithmetic Coding

作　　者：喻莉[1] 戴锐[2] 金欣[1] 朱光喜[1] 

机构地区：[1]华中科技大学电子与信息工程系,武汉430074 [2]武汉光电国家实验室,武汉430074

出　　处：《中国图象图形学报》2007年第9期1515-1519,共5页Journal of Image and Graphics

基　　金：湖北省自然科学基金项目(CGZ0223);武汉青年科技晨光项目(20045006071-18)

摘　　要：二进制化是自适应二进制算术编码中的重要步骤,在二进制级别进行概率估计与编码,能有效降低编解码计算复杂度。本文提出一种新型二进制化方法,根据相邻变换块的非零系数个数存在的高度相关性,对变换块的非零系数个数进行自适应二进制化;在设计二进制化算法的过程中,还针对概率分布近似对称的情况,提出一种简化的将语法元素映射为码字序号的规则。实验结果表明,与传统方法相比,新的算法能在压缩效率相当的前提下,有效降低计算复杂度。Binarization is an elementary step in the framework of context-based adaptive binary arithmetic coding. It is introduced to simplify the context modeling and the subsequent arithmetic coding process. In this paper, we propose a novel binarization scheme for arithmetic coding. Based on the observation that the numbers of nonzero coefficients in neighboring blocks are highly correlated, the number of nonzero coefficients of a block is specifically binarized according to the numbers of nonzero coefficients of its top and left neighbors. In addition, a novel mapping rule is designed to map a syntax element to a code number, according to the observed features of probability distribution. Experimental results show that compared to the conventional scheme, this scheme can reduce decoding complexity with comparable coding efficiency.

关 键 词：算术编码 白适应 二进制化 码字映射规则 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]