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.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
1999年第2期171-175,共5页
Chinese Journal of Biomedical Engineering
关键词
医学图象
小波变换
统计特征
CT
Medical image
Wavelet transform
Statistical property
Generalized Gaussian distribution
x2test
Image compression
