中文说明：
灰度图像简单的去噪方法；MATLAB实现模板操作的方法；空域滤波中常用的平滑滤波器；利用MATLAB程序进行图像去噪。
English Description：
This paper introduces a simple method of gray image denoising, a method of template operation based on MATLAB, a smoothing filter commonly used in spatial filtering, and an image denoising method based on MATLAB program.