中值滤波选择每个邻域像素的中值输出； -截尾均值滤波是指去掉百分率为 的最小值和最大值；定义域滤波中沿着边界的数字是像素的距离；值域就是去掉值域外的像素值。-Median filter to select each neighborhood pixel values ​ ​ in the output - trimmed mean filter is the minimum and maximum percentage of the removed domain filte