［2］Ratha N, Ch en S, Jain A K. Adaptive flow orientation based feature extraction in fingerprint images[J]. Pattern Recognition, 1995,28(11):1657～1672.
[2]
［5］Maio D, Maltoni D. Direct gray-scale minutiae detection infingerprints [J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1997,19(1) :27～40.
[3]
［7］Yu Shiaw-Shian, Tsai Wen-Hsiang. A new thinning algorithm for gray-level images by the relaxation technique [J]. Pattern Recognition, 1990,23(10) :1067～1076.
[4]
［8］Datta A, Parui S K. A robust parallel thinning algorithm for binary images [J]. Pattern Recognition, 1994, 27 (9): 1181 ～1192.
[5]
［1］Lin Hong. Automatic personal identification using fingerprints[D]. US:Michigan State University, 1998:5～46.
[6]
［3］Mehtre B. Fingerprint image analysis for automatic identification [J]. Machine Vision and Application, 1993,6 (2-3): 124 ～ 139.
[7]
［4］Hong L, Jain A K, Bolle R et al. Pankanti. Identity authentication using fingerprints [A]. In: Proc. of First Int\'l Conference on Audio and Video Based Biometric Person Authentication [C], Geneva, Switzerland, 1997:103～ 110.
[8]
［6］Fang Xu-dong, Yau Wei-Yun, Ser Wee. Detecting the fingerprint minutiae by adaptive tracing the gray-level ridge[J]. Pattern Recognition, 2001,34(5): 999～1013.
[9]
［9］Xiao Q, Raafat H. Fingerprint image processing: A combined statistical and structural approach [J]. Pattern Recognition, 1991,24(10):985～992.
