How do i fill a matrix from smaller matrices?

I have 32x32 blocks of an image. The block size is 8x8. How can i reconstruct the 256X256 image?

I wrote the following code but reshape(...) is not giving a proper result.

    idcts = zeros(32,32,8,8);
    for c=1:size(dcts,1)
        for r=1:size(dcts,2)
            temp = double(dcts{c,r});
            temp = idct2(temp);
            idcts(c,r,:,:) = temp;
        end
    end
    idcts = reshape(idcts,256,256);

Answer 1

[Massimo Zanetti]

It seems from you code that your blocks are stored in a cell array of size 32x32 called dcts. If it is so, and each block is 8x8, then just convert the cell to matrix:

mat_dcts = cell2mat(dcts)