Having difficulties finding the radius of the circle?

You need a three-dimensional Hough space for that, parameterized by center-x, center-y and circle radius. Then your most likely position and radius is given as the maximum in the 3D Hough space. I'm afraid this is outside of ImageJ's capabilities, but it should be pretty easy to write up code by hand.

Thanx! I will try that! – user1017919 Oct 28 at 13:19.

Perhaps this may serve you: (In Mathematica).

– user1017919 Oct 28 at 13:20 thanx a lot brother – user1017919 Oct 28 at 13:33 @user yes, you can, but Mma is expensive. The same functions are available for free in OpenCV. – belisarius Oct 28 at 13:46 ok thanx, open cv seems like promising lead :) – user1017919 Nov 1 at 8:35.

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