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

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!

Asked:

on 24 Feb 2018

Answered:

on 24 Feb 2018

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