[1] OTSU N.Discriminant and least square threshold selection[J].In:Proc.4IJCPR,1978,6:592-596.
[2] TSAI W.Moment-preserving thresholding:a new approach.computer vision[J].Graphics and Image Processing,1985,29:377-393.
[3] KAPUR J N,SAHOO P K,WONG K A.A new method for gray-level picture thresholding using the entropy of the histogram[J].Computer Vision,Graphics and Image Processing,1985,29:273-285.
[4] ABUTALEB A S.Thresholding of gray-level picture using two-dimension entropy[J].Computer Vision,Graphics and Image Processing,1989,47:22-32.