How do i fill a matrix from smaller matrices?

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eri ccartman 2016-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/309857-how-do-i-fill-a-matrix-from-smaller-matrices

编辑： Massimo Zanetti 2016-10-31

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);

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Answer 1

Massimo Zanetti 2016-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/309857-how-do-i-fill-a-matrix-from-smaller-matrices#answer_241352

编辑：Massimo Zanetti 2016-10-31

在 MATLAB Online 中打开

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)