Extract patches and save its coordinate points

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MD RESHAD UL HOQUE 2018-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/379485-extract-patches-and-save-its-coordinate-points

评论： MD RESHAD UL HOQUE 2018-1-30

I have an image [800 x 900 x 4 ]. I want to extract patches [patch size= 17 x 17] and at the same time save its corresponding coordinate (center).Can anyone give me suggestions or code for that?.

Thanks

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Walter Roberson 2018-1-29

Overlapping patches or not overlapping ?

MD RESHAD UL HOQUE 2018-1-29

Overlapping patches

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Answer 1

Rik 2018-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/379485-extract-patches-and-save-its-coordinate-points#answer_302290

编辑：Rik 2018-1-29

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You previous question suggests you already have the center coordinates, why not save that variable as well? Anyway, you can easily extend the solution there to include the center coordinate.

(Also, it's better not to overwrite the patch function with a variable)

selected_patches = cell(length(x),2);
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,1}=IM(xtemp,ytemp,:);
    selected_patches{i,2}=[x(i) y(i)];
end