# Convert image into Patches of size 64*64 and get each patch

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Tahir 2015년 5월 14일
편집: Neha Rathore 2022년 4월 28일
Hello, I have RGB image dataset.I want to convert an image into patches and save each patch.How to do this in matlab. The patch size should be 64*64
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Image Analyst 2021년 4월 6일
@Rajesh Das, and should be down below in the official "Answer" section with all the other answers of this question.

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### 채택된 답변

Sven 2015년 5월 14일
편집: Sven 2015년 5월 14일
Hi Tahir, try this:
imSz = size(I);
patchSz = [64 64];
xIdxs = [1:patchSz(2):imSz(2) imSz(2)+1];
yIdxs = [1:patchSz(1):imSz(1) imSz(1)+1];
patches = cell(length(yIdxs)-1,length(xIdxs)-1);
for i = 1:length(yIdxs)-1
Isub = I(yIdxs(i):yIdxs(i+1)-1,:);
for j = 1:length(xIdxs)-1
patches{i,j} = Isub(:,xIdxs(j):xIdxs(j+1)-1);
end
end
This produces a cell of your 64x64 patches:
>> patches
patches =
[64x64 uint8] [64x64 uint8] [64x64 uint8] [64x64 uint8]
[64x64 uint8] [64x64 uint8] [64x64 uint8] [64x64 uint8]
[64x64 uint8] [64x64 uint8] [64x64 uint8] [64x64 uint8]
[64x64 uint8] [64x64 uint8] [64x64 uint8] [64x64 uint8]
And you can access each one:
figure, imagesc(patches{2,3})
Did that do what you wanted?
Thanks, Sven.
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Neha Rathore 2022년 4월 28일
편집: Neha Rathore 2022년 4월 28일
Hi! The code worked well. How can i recombine these patches to form an original image.

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### 추가 답변(2개)

Image Analyst 2015년 5월 14일
This is answered by the FAQ in two different ways (mat2cell and indexing). Take your pick as to which is easier, more convenient, and intuitive for you.
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Image Analyst 2018년 9월 8일
I do have a version of blockproc() that uses a separate function, where you can do more complicated operations than in an anonymous function. It is attached.
There is also a function called graycoprops() that you may want instead of graycomatrix(). It gives you key features from the GLCM matrix.

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hello. its work well on 256 by 256 image but i have 512 by 512 image. it gives the following error. Index exceeds matrix dimensions.
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Walter Roberson 2017년 3월 30일
See the FAQ that Image Analyst posted.

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