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* Handle det == 0 in findCircle3pts. Issue 16051 shows a case where findCircle3pts returns NaN for the center coordinates and radius due to dividing by a determinant of 0. In this case, the points are colinear, so the longest distance between any 2 points is the diameter of the minimum enclosing circle. * imgproc(test): update test checks for minEnclosingCircle() * imgproc: fix handling of special cases in minEnclosingCircle()