Finding radius by fitting circles to partial lines

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A
A 2013-3-16
Hello, I am trying to find the radius of circles from images which contain only a portion of the circle image, like this: http://postimage.org/image/hs9wbu3fv/ is anyone familiar with how to do this, for instance using Hough transforms? Thank you,

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Image Analyst
Image Analyst 2013-3-17
Matt J
Matt J 2013-3-17

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