[1] [1] Dimitrios Ioannou，Walter Huda，Andrew F Laine. Circle recognition through a 2D Hough transform and radius histogram [J]. Image and Vision Computing(S0262-8856)，1999，17(1): 15-26.

[2] [2] Lei Xu，Erkki OJA，Pekka KULTANEN．A new curve detection method: randomized Hough transform(RHT) [J]. Pattem Recognition Letters(S0167-8655)，1990，11(5): 331-338.

[4] [4] CHEN The-chuan，CHUNG Kuo-liang. An efficient randomized algorithm for detecting circles [J]. Computer Vision and Image Understarlding(S1077-3142)，2001，83(2): 172-191.