摘要
本文采用离散小波变换的方法,利用G小波变换(GWT)对TIFF格式的灰度图象进行了压缩及放大。利用G小波基函数的性质,提出了快速G小波变换的实现方案(FGWT),使得G小波变换的速度得到了显著的提高;另外,对G小波变换进行了一些改进,使图象可以按任意比例进行压缩及放大;在小波变换后,对数据进行了量化处理,提高了图象的保真度。
G-wavelet transformation is used for compressing and amplifing TIFF greyscal image by discrete wavelet transformation method in this paper. Fast G-wavelet Transformation method is presented by using properties of G-wavelet base function so that the speed of G-wavelet transformation is increased dramatically. Moreover, G-wavelet transformation is improved, therefor, images are compressed and amplified according to arbitrary scale. A high fidelity of image is obtained through processing data by quantification after G-wavelet transformation.
出处
《小型微型计算机系统》
EI
CSCD
北大核心
1998年第2期44-49,共6页
Journal of Chinese Computer Systems
基金
国家自然科学基金
关键词
小波变换
G小波变换
图像压缩
图像放大
Wavelet transformation Wavelet coefficient Wavelet base function Fast G-wavelet transformation