[5] [5] XU Y, WU W Y, CHANG E C,et al.A two-layer structure prediction framework for microscopy cell detection［J］.Computerized Medical Imaging & Graphics, 2015, 41:29-36.

[6] [6] THOMAS S M.A simple approach for the estimation of circular ARC centre and its radius［J］.Computer Vision,Graphics, and Image Processing, 1989, 45(3)：362-370.

[10] [10] SHORTIS M R, CLARKE T A, SHORT T.A comparison of some techniques for the subpixel location of discrete target images［J］.Proceedings of the SPIE, 1994.doi:10.1117/12.189136.