%以saturn.tif為例，加入椒鹽噪聲，并在MATLAB中調用B = filter2(h,A)實現均值過濾器
I=imread('eight.tif');
J=imnoise(I,'gaussian',0.02);
imshow(I)
figure,imshow(J)
K1=filter2(fspecial('average',3),J)/255;
K2=filter2(fspecial('average',5),J)/255;
K3=filter2(fspecial('average',7),J)/255;
figure,imshow(K1)
figure,imshow(K2)
figure,imshow(K3)