中文说明：
数字图像在产生过程中经常会受到噪音污染。因此，对于数字图像应该对其进行去噪音处理。在传统的基于傅里叶变换的信号去噪音方法中，可以使得信号和噪音的频带重叠部分尽可能的小，这样就可以在频域通过时，不需改变滤波方法而将信号和噪音分隔开来。但是，如果信号和噪音的频域重合时，用该方法进行噪音处理的效果就比较差。
English Description：
Digital images are often polluted by noise in the process of generation. Therefore, the digital image should be denoised. In the traditional signal denoising method based on Fourier transform, the frequency band overlap of signal and noise can be as small as possible, so that the signal and noise can be separated without changing the filtering method when passing through the frequency domain. However, if the frequency domain of signal and noise coincides, the effect of noise processing with this method is relatively poor