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This question already has an answer here:

I've tried the solutions given in How to find a circular object in the image glaucoma? to detect the ellipse, but the detection results are not quite what I wanted.

In glaucoma we have a cup to disk ratio terms in which I must looking for calculate between the diameter of the optic disk (VDD) and optic cup (VCD). optical disks showed with a red circle (red channel) and optic cup showed with a yellow circle (green channel). how about calculating the diameter between optic disk and optic cup? sorry my first question is not complete. i have already detect the optic disk with canny edge detection, but i have not found a way to calculate the diameter of optic disk and optic cup. How might I do that?

This is one example of an image glaucoma

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merged by J. M. will be back soon Nov 17 '15 at 5:18

This question was merged with Detecting an ellipse in a glaucoma photo because it is an exact duplicate of that question.

  • $\begingroup$ You posted a very similar question a few hours ago. This version of the question will probably be closed as a duplicate, but it does contain more detail and is better formed than your first version. I would suggest that you edit your original question by adding the details, links, and formatting that you have here to that one. $\endgroup$ – MarcoB Nov 16 '15 at 13:56