Image patch extraction from given co-ordinate
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MD RESHAD UL HOQUE
el 25 de En. de 2018
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
el 25 de En. de 2018
What size should those patches be? And is your image a 3D gray scale image, or some other format? (YMCK perhaps?)
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Rik
el 25 de En. de 2018
Editada: Rik
el 29 de En. de 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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