How to find a circle segment coordinates in image?

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Itai Kadosh
Itai Kadosh am 14 Feb. 2016
Kommentiert: Image Analyst am 14 Feb. 2016
Hi,
I need to count the number of hairs in a circle located in a image (the images are attached), but I don't want to relate to the rest of the image. How can I isolate the circle from the rest of the image?
Itai

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Image Analyst
Image Analyst am 14 Feb. 2016
If you use a template that is opaque, say, black, then it would be trivial: just threshold.
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Itai Kadosh
Itai Kadosh am 14 Feb. 2016
But I received this image and I can't change the way the image is taken. There is a way to mark only the circle?
Thanks, Itai
Image Analyst
Image Analyst am 14 Feb. 2016
You can use imellipse. See attached demo.

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