基于色差分析与JPEG2000的彩色图像编码  

Color Image Coding Based on Chromatism Analysis and JPEG2000

作　　者：陈宇拓[1] 韩旭里[1] 余英林[2] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083 [2]华南理工大学电子与通信工程系,广东广州510641

出　　处：《小型微型计算机系统》2007年第6期1103-1109,共7页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(60372068)资助.

摘　　要：在RGB色彩空间,将彩色图像3个色彩分量之一用JPEG2000进行编码,该色彩分量与另两个色彩分量的差值依据其分布的均匀程度,用四叉树算法分割成若干个不重叠的子块,然后计算出每个子块的相关系数,由此对另两个色彩分量的编码就转变成对相关系数的编码.解码则是由JPEG2000的逆变换得到重构的色彩分量和重构的相关系数来实现.实验结果表明该方法不仅编解码速度快,而且信噪比、压缩比及视觉效果明显优于JPEG2000等算法的编码结果.In RGB color space,one of the three color components of a color image is coded using JPEG2000 coding,and the chromatism of that the component with the other two components is segmented into some non-overlapping subregions by quadtree partitioning algorithm according to the homogeneous degree of its distribution. Then the correlation coefficients in every subregion are calculated out. Thus the coding for the other two components becomes the coding of correlation coefficients. Decoding is achieved by the reconstructed components obtained by using the inverse transform of JPEG2000 and the reconstructed correlation coefficients. Experiment results show that this method is of high coding and decoding rates,and its signal to noise ratio, compression rate and visual quality are better than those of the coding results obtained by other algorithms such as JPEG2000.

关 键 词：色差分析 不相关度 相关系数 JPEG2000 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]