7Mitsuo Takeda,Kazuhiro Mutoh.Fourier transform profilometry for the automatic measurement of 3-D object shapes[J].Applied Optics.1983,22(24):3977-3982.
8A flexible new technique for camera calibration[J]. IEEE Transactions on pattern Analysis and Ma- chine Intelligence ,2000, 22(11) : 1330-1334.
9LEE S, CHUNG S. A comparative Perfomumance Study of Several Global Thresholding Techniques for Segmentation [J]. Computer Vision, GraPhics, and Image Proeessing , 1990,52 : 171-190.
10OTSU N. A threshold selection method from gray- level histograms [J]. IEEE Trans on Systems, Man, and Cyber-netics , 19 7 9,9 ( 1 ) : 6 2- 6 6.