6Zhang Zhengyou. Parameter estimation techniques: A tutorial with application to conic fitting [J]. Image and Vision Computing Journal, 1997, 15(1): 59~76
7Bookstein F L. Fitting conic sections to scattered data [J]. Computer Vision, Graphics, and Image Processing, 1979, 9(1): 56~71
8Sampson P D, Fitting conic sections to very scattered data: An interactive refinement of the Bookstein algorithm [J]. Computer Vision,Graphics and Image Processing, 1982, 18(1): 97~108
9Gander W, Golub G H, Strebel R. Least-sqares fitting of circles and ellipses [J]. BIT, 1994, 34(4): 558~578
10Rosin P L. A note on the least squares fitting of ellipse [J]. Pattern Recognition Letters, 1993, 14(10): 799~808