3Chin R T, Wan H0 K,Stover D L et al.A One-pass Thinning Algorithm and Its Parallel Implemcntation[J].Comput. Vision Graphics lmage Processing, 1987,40(1):30-40.
4Hilditch C J.Linear Skeletons from Square Cupboards[J].Machine Intelligence, B.Meltzer and D.Michie.Eds.,Elsevier, New York,1969,4: 403-420.
5Nieuwenhuizen P R V,Kiewiet O, Bronsvoort W F.An Integrated Line Tracking and Vectiorizalion AIgoriihm[J].Compuler Graphics Form, 1994,13(3):349-359.
