if i have 256x256 matrix and i want to zero padding it to 512x512 how can i do ?

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nopphakorn somsuan
nopphakorn somsuan 2019-9-26
回答： James Tursa 2019-9-26
I have file name k_im which has 256x256 matrix and i want to do zero padding it to matrix 512x512 help me write a code pls tyvm.

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回答（2 个）

the cyclist
the cyclist 2019-9-26
编辑：the cyclist 2019-9-26
If you have the Image Processing Toolbox, you can use padarray.
If not,
paddedM = zeros(512:512);
paddedM(129:384,129:384) = M;
(assuming you want equal padding on all sides, and I did my math right).
James Tursa
James Tursa 2019-9-26
If you just want it padded on two sides, then simply
k_im = your 256x256 matrix
k_im(512,512) = 0; % pad 0's out to (512,512) element

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