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.
出处
《小型微型计算机系统》
CSCD
北大核心
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.
关键词
色差分析
不相关度
相关系数
JPEG2000
chromatism analysis
non-correlation degree
correlate coefficient
JPEG2000
