MATLAB: How to crop required ROI from an image

roi

 % code
   h = impoly(gca,[188,30; 189,142; 93,141; 13,41]);
   api = iptgetapi(h);
   fcn = makeConstrainToRectFcn('impoly',get(gca,'XLim'),get(gca,'YLim'));
   api.setPositionConstraintFcn(fcn);
   position = wait(h);
   a=imcrop(I,[250 91;251 203;155 202;75 102]]);
   imshow(I);
end
I am working on medical image processing.
I need to crop eye only from face & position is not constant for all images.
so i use polygonal ROI.
but it shows error.

Best Answer

Call imcrop() with no arguments if the coordinates are not the same from image to image. This will let the user interactively select the box.
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