[2] IZQUIERDO M A G , SANCHEZ M T , IBANEZ A , et al. Sub-pixel measurement of 3D surfaces by laser scanning[J]. Sensors and Actuators A: Physical, 1999, 76(1-3): 1-8.

[6] GEMAN D, JEDYNAK B. An Active Testing Model for Tracking Roads in Satellite Images[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1996, 18(1): 1-14.

[7] KOLLER T M, GERIG G , SZEKELY G , et al. Multiscale Detection of Curvilinear Structures in 2-D and 3-D Image Data [C]. Los Alamitos, Calif : IEEE CS Press, 1995. 864-869.

[8] JANG J H, HONG K S. Detection of curvilinear structures and reconstruction of their regions in gray-scale images[J]. Pattern Recognition, 2002, 35(4): 807-824.

[9] STEGER C. An Unbiased Detector of Curvilinear Structures[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1998, 20(2): 113-125.

[10] WANG L, PAVLIDIS T. Direct Gray-Scale Extraction of Features for Character Recognition[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1993, 15(10): 1053-1067.