How can I extract the diameter of the circle in an RGB image in this particular case?

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Usman Mahmood
Usman Mahmood am 24 Feb. 2018
Beantwortet: Image Analyst am 24 Feb. 2018
so I have about 1000 similar images (cant manually use imtools) and in each case, the diameter underneath is changing. What is a good approach to determine the diameter of the grey/blue circle? The red color in this particular case is the noise. Help me!

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Image Analyst
Image Analyst am 24 Feb. 2018
Try using imfindcircles().

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