Image patch extraction from given co-ordinate

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MD RESHAD UL HOQUE 2018-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/378889-image-patch-extraction-from-given-co-ordinate

编辑： Rik 2018-1-29

Hello everyone, I have an image [800 x 900 x 4]. I have to extract patches with a center point [(x1,y1),(x2,y2)... ]. How can I do that ?.

Thanks

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Rik 2018-1-25

What size should those patches be? And is your image a 3D gray scale image, or some other format? (YMCK perhaps?)

MD RESHAD UL HOQUE 2018-1-25

Patches size 17 x 17. It is 4D image.

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Rik 2018-1-25

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编辑：Rik 2018-1-29

在 MATLAB Online 中打开

Your image is not 4D. It has 3 dimensions, unless what you posted in your question is not true.

patch{i}=IM(x(i)+[-8 8],y(i)+[-8 8],:);

This makes use of the quirk of Matlab that if you enter corner coordinates, it will return the entire square part.

For edge cases, the code below crops the part outside of the matrix (my comment below has a copy-and-past bug)

selected_patches = cell(length(x),1);
for i=1:length(x)
    xtemp=x(i)+[-8 8];
    xtemp(xtemp<1)=1;xtemp(xtemp>size(IM,1))=size(IM,1);
    ytemp=y(i)+[-8 8];
    ytemp(ytemp<1)=1;ytemp(ytemp>size(IM,2))=size(IM,2);
    selected_patches{i}=IM(xtemp,ytemp,:);
end