CT图象小波变换系数的统计特征  

STATISTICAL PROPERTIES OF WAVELET TRANSFORM COEFFICIENTS OF CT IMAGES

作　　者：虞正华[1,2] 周功禹[1,2] 余松煜 茅一民[1,2] 

机构地区：[1]上海交通大学 [2]东南大学

出　　处：《中国生物医学工程学报》1999年第2期171-175,共5页Chinese Journal of Biomedical Engineering

摘　　要：本文研究了ＣＴ图象小波变换系数的统计特征，用ｘ２检验方法得到了小波变换系数的统计分布。实验表明，各高频子图象系数近似服从ｒ＝０．４的广义高斯分布。同时计算了均值、方差、相关系数等统计量，从中得到一些可以指导医学图象编码的结论。Statistical properties of wavelet transform coefficients of CT images were studied. Using the x2 test, we determined best fitting distribution functions for the wavelet transform coefficients. Experiments showed that the generalized Gaussian distribution of r=0.4 provided a good approximation to the coefficients of high frequency subimages. Besides, the sample mean, variance and correlation characteristics were studied. Some conclusions were drawn which might guide the study of medical image compression.

关 键 词：医学图象 小波变换 统计特征 CT 

分 类 号：R814.42[医药卫生—影像医学与核医学] R318.04[医药卫生—放射医学]