How do I detect the ellipses in the image attached?

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Ashutosh 2013-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/81290-how-do-i-detect-the-ellipses-in-the-image-attached

This is a ring type target which I need to auto-detect and number. Currently I am trying to fit ellipse which is failing because I get all four connected components as separate ellipses.

What should be a robust strategy to detect the outer, the inner and the inner most ellipse so as to be able to detect code of the target?

In actual scenario, I will have many more targets like this in a single image, which will appear distorted depending upon the location of viewing camera.

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Image Analyst 2013-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/81290-how-do-i-detect-the-ellipses-in-the-image-attached#answer_91025

Use bwconvhull() to get the convex hull of the whole set of objects. That will work better, but not perfect because you're missing a quadrant.

Also, see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_fit_a_circle_to_a_set_of_XY_data.3F

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Ashutosh 2013-9-6

Absolutely correct Analyst.My mistake.

Image Analyst 2013-9-6

You can't know the accuracy unless you have some "ground truth." I only told you one method: find the boundary points, then fit it to an ellipse. I don't know what you did after that for your second method. Did you then use poly2mask() to make a binary image and find the centroid with regionprops()?

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