说明：  大多数图像去噪的方法,尤其是针对高斯白噪声的去噪方法,从本质上来说,都是低通滤波的方法. 低通滤波是一把双刃剑,在消除图像噪声的同时,也会消除图像部分有用的高频信息.因此,各种图像去 噪方法,其实就是在去噪和保留有用高频信息之间进行权衡
(The majority of image denoising methods, especially for Gaussian white noise of the de-noising method, essentially, are low-pass filtering method. Low-pass filter is a double-edged sword, in the elimination of image noise at the same time, will be useful to eliminate some of the high frequency image information. Therefore, various image denoising methods, in fact, is useful in de-noising and retain high-frequency trade-off between information)