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本文给出了一种在圆度评估中求任意位置的平面圆圆心及半径的最小二乘算法，该算法也同样适用于空间球心及半径的求解。
In this paper, we present a least squares algorithm for finding the center of a circle and the radius of an arbitrary position in the roundness evaluation. The algorithm is also applicable to the solution of the sphere center and radius.