How to crop an image A which is a subset of an image B
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dheeraj surabhi on 12 Oct 2015
Commented: dheeraj surabhi on 30 Oct 2015
I have two images where image A is a subset of image B.I could with feature matching technique - identify, match and show the images as a pair. Now that i have identified and matched image A with image B. i want to clip out(crop) that exact region from image B and create a new image. How can i do this, any help is appreciated ?
Dima Lisin on 13 Oct 2015
Edited: Dima Lisin on 25 Oct 2015
If you have matched the points, then you can simply find the bounding box of the matched points:
points = round(matchedTarget.Location);
left = min(points(:, 1));
right = max(points(:, 1));
top = min(points(:, 2));
bottom = max(points(:, 2));
croppedImage = target(top:bottom, left:right, :);
More Answers (2)
If I understood correctly, you have found the part in image B that is exactly like image A, and now you want to crop that part of image B. Because both are identical, the cropped image would be exactly like A, so you can just write
C = A;
C = B(ind1,ind2,:);
where ind1, ind2 are the vectors ob indices that define the region.
You have said you "have identified and matched image A with image B". If you did that, then you know the coordinates, for example like I did in my attached normxcorr2() demo. So simply use imcrop() after that.
Sorry - I don't have the Computer Vision System Toolbox. Perhaps Dima will answer you.
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