How do I divide an image into possible number of blocks and apply a set of functions to each block?

Here is a sample image.

[Hans Scharler]

What are building this for?

Answer 1

[Walter Roberson]

Use blockproc() .

Answer 2

[vahid rowghanian]

If you want to divide the image into squares of size gs ( e.g. 2,3,4,5,6,7,8,9,10,…), you can use the following code. This function extracts gs by gs patches from the input image and stores them into 'patch' variable.

function [ patchim , npatchim ] = divideimage (im , gs)
m = size(im,1);
n = size(im,2);
if mod(m,gs)>0
    m = m - mod(m,gs) + gs;    
end
if mod(n,gs)>0
    n = n - mod(n,gs) + gs;
end
k1 = m / gs;
k2 = n / gs;
npatch = 1;
patch = zeros(gs,gs,3,k1*k2);% for 3-D images
im = imresize(im,[m,n]);
for i = 1 : k1
    for j = 1 : k2
        rmin = ( i - 1 ) * gs + 1;
        rmax = i * gs;
        cmin = ( j - 1) * gs + 1;
        cmax = j * gs;
        %%%%% do processes
        patch ( : , : , : , npatch) = im( rmin : rmax , cmin : cmax , : );
        npatch = npatch + 1;
    end
end
npatchim = npatch - 1;
patchim = patch;

end