downsampling the filtered image

i have iteratively filtered the image using low pass filtering. now i need to downsample the filtered images. how to implement?

Answer 1

[Matt J]

By indexing, perhaps, e.g.,

 x=1:10;
 xdownsampled=x(1:2:end);

Or, if downsampling at non-integer locations, by interpolation. See griddedInterpolant().

[sheno39]

if true
close all;
clear all;
clc;
I = imread('peppers.png'); 
figure,imshow(I),title('Original Image');
M=[1 1 1;1 1 1;1 1 1]./9;
M=ones(5,5)./25;
h = fspecial('gaussian',[5 5]);
J=imfilter(I,h);
K=imfilter(J,M);
figure,imshow(K),title('Low pass filtered image1');
L=imfilter(K,M);
figure,imshow(L),title('Low pass filtered image2');
M=imfilter(L,M);
figure,imshow(M),title('Low pass filtered image3');

end

i need to reduce the size of the image after each filteration? Is it possible Sir?

[Matt J]

Yes, using the methods I mentioned. Or IMRESIZE.

[sheno39]

Thank You.