Image patch extraction from given co-ordinate
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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
2 Commenti
Rik
il 25 Gen 2018
What size should those patches be? And is your image a 3D gray scale image, or some other format? (YMCK perhaps?)
Risposta accettata
Rik
il 25 Gen 2018
Modificato: Rik
il 29 Gen 2018
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
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