semi automatic circle fit function

In this image on the sphere there are five laser strips. What is semi automatic circle fit function.. In one document i read that using this we can find sphere centre and radius within the image plane.. So, i want to find it in MATLAB and require some details about it..

Answer 1

[Mark Hayworth]

Would the FAQ help? See http://matlab.wikia.com/wiki/FAQ#How_can_I_fit_a_circle_to_a_set_of_XY_data.3F