888999991122222.m

频域实现图像的滤波是一种比较好的滤波办法

I=imread('lena.tif');
J1=imnoise(I,'salt & pepper',0.02);
J2=imnoise(I,'gaussian',0.02);
h=ones(5,5)/25;
I1=imfilter(J1,h);
I2=imfilter(J2,h);
subplot(2,2,1);
imshow(J1);
subplot(2,2,2);
imshow(I1);
subplot(2,2,3);
imshow(J2);
subplot(2,2,4);
imshow(I2);