[4] [4] Yuen H K，Illingwoth J，Kitter J. Detecting Partially occluded ellipses using the hough transform [J]. Image Vision and Computing (S0262-8856)，1989，7(1): 31-37.

[5] [5] Yoo J H，Sethi I K. An ellipse detection method from the polar and pole definition of conics [J]. Pattern Recognition (S0031-3203)，1993，26(2): 307-315.

[6] [6] Xu L，Oja E，Kultaned P. A new curve detection method: Randomized hough transform (RHT) [J]. Pattern Recognition Letter (S0167-8655)，1990，11(5): 331-338.

[9] [9] Rosenfeld A，Kak A C. Digital Picture Processing: 2nd Edition [M]. New York: Academic Press，1982.

[11] [11] Fisher M A，Bolles R C. Random Sample Consensus: A Paradigm for Model Fitting with Applications to Image Analysis and Automated Cartography [J]. Communications of the ACM (S0001-0782)，1981，24(6): 344 – 350.