Matlab code to split an image into a square grid of square blocks

Question

Abigail Thomas 2019-10-9

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回答： Matt J 2019-10-10

采纳的回答： Matt J

Hello everyone,

I am having a hard time writing a matlab code that splits an image into a square grid of square blocks of side equal to

where

then shuffle the grid using randperm. So it is based on user input of how much the image should be cut down to, say the user inputs SplitImage(Image, r). All help is appreciated.

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Answer 1

Matt J 2019-10-10

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在 MATLAB Online 中打开

This uses mat2tiles (Download)

 A=mat2tiles( imread('cameraman.tif'), [32,32]);
 
 [m,n]=size(A);
 
 B=cell2mat(A(randperm(m), randperm(n)));
 
 imshow(B)

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Answer 2

Walter Roberson 2019-10-9

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See mat2cell() to do the splitting into cell arrays. Then randomize the cell array order, and then cell2mat() to restore.

You will have problems if your block size is not an exact divisor of the array size unless you take special care that all rows and columns in the randomized blocks add up to consistent sizes.