# I know how to divide my 256x256 image into 16x16 blocks using mat2cell. Now I want to access those 16x16 blocks successively to further divide them into 4x4 blocks.

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Abhishek Baba on 20 Oct 2020
Edited: Matt J on 20 Oct 2020
I'm able to do this further division by taking one 16x16 block at a time (first using cell2mat and then again using mat2cell this time with parameter 4), but I want to do it using some 'for' loop, or anything for that matter in which I wouldn't have to access each 16x16 blocks individually.
Any idea how I can achieve that?
Thank you.

Ameer Hamza on 20 Oct 2020
Edited: Ameer Hamza on 20 Oct 2020
img = rand(256);
C1 = mat2cell(img, 16*ones(16,1), 16*ones(16,1));
C2 = cellfun(@(x) mat2cell(x, 4*ones(4,1), 4*ones(4,1)), C1, 'UniformOutput', 0);

Matt J on 20 Oct 2020
Edited: Matt J on 20 Oct 2020
Using mat2tiles
Image=rand(256);
ImageCell=mat2tiles(mat2tiles(Image,[4,4]),[4,4]);
>> ImageCell{2,3}
ans =
4×4 cell array
{4×4 double} {4×4 double} {4×4 double} {4×4 double}
{4×4 double} {4×4 double} {4×4 double} {4×4 double}
{4×4 double} {4×4 double} {4×4 double} {4×4 double}
{4×4 double} {4×4 double} {4×4 double} {4×4 double}