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Major axis and minor axis
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How can I plot the major axis and minor axis for an object in an image?
2 Comments
Image Analyst
on 10 Nov 2012
I've just added a section on "How do I create an ellipse" to the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_an_ellipse.3F so that might help you.
Accepted Answer
Walter Roberson
on 27 Aug 2012
regionprops() to get the centroid and orientation (angle). After that it becomes straight trig. The axes length is R, compute R*cos(theta), R*sin(theta), and center those displacements on the centroid.
17 Comments
Image Analyst
on 9 Sep 2012
Pamela, I haven't heard of that method to determine similarity. Much more common is SSIM ( http://en.wikipedia.org/wiki/SSIM) and friends, or even PSNR. Or you can use image moments: http://en.wikipedia.org/wiki/Image_moment
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