说明：  详细介绍小波变换及其在图像处理中的应用，达90个页面，包括小波变换简介、小波变换在图像去噪中的应用、小波变换在图像压缩中的应用
(Details wavelet transform and its applications in image processing, up to 90 pages, including Introduction to wavelet transform, wavelet transform denoising wavelet transform in image compression applications)