图像的邻域运算（平滑）

%平滑

I=imread('coins.tif');

Inoised=imnoise(I,'gaussian',0.1,0.004);

h=ones(3,3)/5;

h(1,1)=0;

h(1,3)=0;

h(3,1)=0;

h(1,3)=0;

I2=imfilter(Inoised,h);

subplot(2,1,1);imshow(Inoised);

subplot(2,1,2);imshow(I2);

%中值滤波

I=imread('coins.tif');

J=imnoise(I,'salt&pepper',0.02);

K=medfilt2(J);

subplot(1,2,1);imshow(J);

subplot(1,2,2);imshow(K);