中文说明：对被噪声污染的图像采用空间域的平滑滤波方法，主要有线性空间域滤波法和非线性滤波法。包括中值滤波，均值滤波，维纳滤波。
English Description：
Noise smoothing method of image based on spatial domain, mainly are linear spatial filtering method and nonlinear filtering method. Includes median filtering, filtering, Wiener.