①去噪得到理想图像

均值滤波获取理想图像，滤波窗口取3 3；

改进均值滤波获取理想图像，滤波过程中首先去掉滤波窗口中的最大值点和最小值点，然后进行滤波，滤波窗口取3 3；

利用中值滤波法，获取理想图像，滤波窗口取3 3或5 5；

改进中值滤波法，获取理想图像，选取中值滤波法的中间三个值的平均作为输出，滤波窗口取3 3；

②利用原始图像减去理想图像得到噪声图像。

-① get the ideal image denoising mean filtering ideal image acquisition, filtering window take 3 3　improvements mean filter to obtain the ideal image, filtering process, first remove the filter window, the maximum point and minimum point, and then filtering, filtering window to take 3 3　the use of median filtering method, to obtain the ideal image, filtering window or take 3 3 5 5　improved median filtering method, to obtain the ideal image,　the average value as the output in the middle of the three median filtering method, Take the filter window 3 3　② using the original image noise image obtained by subtracting the ideal image.