how to break an image into sub images

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Rao 2012-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/47379-how-to-break-an-image-into-sub-images

评论： Walter Roberson 2021-10-19

i have an image having pixels 512*512 . i want to break it in equal sub images (for eg like into images of 8*8) and want to apply a function (can be any) on each sub image ??

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回答（3 个）

José-Luis 2012-9-4

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https://ww2.mathworks.cn/matlabcentral/answers/47379-how-to-break-an-image-into-sub-images#answer_57870

Google, as well as Matlab answers are your friends:

http://stackoverflow.com/questions/1637000/how-to-divide-an-image-into-blocks-in-matlab

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Zainab Ishfaq 2018-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/47379-how-to-break-an-image-into-sub-images#answer_322330

编辑：Walter Roberson 2020-2-13

在 MATLAB Online 中打开

Height=8; width=8;
currentimage = imread('Image.png');
[r,c,~]=size( currentimage );
count=0;
for i=0:Height:r
count=count+1;
for j=0:width:c
if((i+Height)<r && (j+width)<c)
Image=imcrop( currentimage ,[(i+1) (j+1) Height width]);
imwrite(Image,horzcat(currentfilename, num2str(count),'.tif'));
end
end
end

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shital shinde 2020-2-21

编辑：shital shinde 2020-2-21

Thanks sir. It work now. I have one question. Can we parallelize the above example using parallel computing toolbox.

Walter Roberson 2020-2-21

编辑：Walter Roberson 2020-2-21

Yes. Just change for i to parfor i

As we have advised you before, the result will almost certainly be notably slower than your current code. But I know from your previous questions that you feel inclined to do that testing yourself.

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