[6] REG G.WILLSON,STEVEN A.S.What is the center of the image[J].J Opt Soc Am A,1994,11(11):2946 2955.

[8] TSAI R Y.A versatile camera calibration technique for highaccuracy 3D machine vision metrology using off the shelf TV cameras and lenses[J].IEEE Journal of Robotics and Automation,1987,RA 3(4):323-344.