说明：  实现离散小波变换和DCT变换的对比，包括去噪，psnr等方面的性能的比较 其中小波变换的介数可以由用户自己定义
(Achieve the discrete wavelet transform and DCT transform contrast, including the de-noising, psnr comparison of the performance areas in which the number of wavelet transform can be mediated by the user defined)