3图像四倍减采样matlab

clear;clc;

% I=imread('Lena.bmp');

I=imread('微信图片_20220429194904_512_512.bmp');

[m,n]=size(I);

mm=1;

nn=1;

for i=1:2:m

for j=1:2:n

I1(mm,nn)=I(i,j);

nn=nn+1;

end

mm=mm+1;

nn=1;

end

figure;imshow(I); title('原图');

figure;imshow(I1);title('采样图');