滤波核3×3的均值滤波。

F=imread('D:\Desktop\66.png');
F=rgb2gray(F);
f=double(F);
[row,col]=size(f);
f1=zeros(row,col);for i=2:row-1for j=2:col-1fx=[f(i-1,j-1),f(i-1,j),f(i-1,j+1),f(i,j-1),f(i,j),f(i,j+1),f(i+1,j-1),f(i+1,j),f(i+1,j+1)];f1(i,j)=sum(fx,'all')/9/256; end
end
figure(1);
subplot(1,2,1),imshow(F);title('原始图像');
subplot(1,2,2),imshow(f1);title('均值滤波');

滤波核3×3的中值滤波。

F=imread('D:\Desktop\66.png');
F=rgb2gray(F);
f=double(F);
[row,col]=size(f);
f2=zeros(row,col);for i=2:row-1for j=2:col-1fy=[f(i-1,j-1),f(i-1,j),f(i-1,j+1),f(i,j-1),f(i,j),f(i,j+1),f(i+1,j-1),f(i+1,j),f(i+1,j+1)];for x=1:9for y=x+1:9if fy(y)> fy(x)zh= fy(x);fy(x)= fy(y);fy(y)=zh;endendendf2(i,j)= fy(5)/256;end
end
figure(1);
subplot(1,2,1),imshow(F);title('原始图像');
subplot(1,2,2),imshow(f2);title('中值滤波');