拟合圆，具体的参考文献为“ G. Taubin, "Estimation Of Planar Curves, Surfaces And Nonplanar Space Curves Defined By Implicit Equations, With Applications To Edge And Range Image Segmentation",IEEE Trans. PAMI, Vol. 13, pages 1115-1138, (1991)”-Fitting circle, the specific references to G. Taubin， Estimation Of Planar Curves of the Surfaces And Nonplanar SPACE Curves the Defined BY Implicit Equations, with Applications, the To the Edge And the Range Image Segmentation, IEEE Trans PAMI, Vol 13, pages 1115-1138, (1991)