In this paper, an Improved gradient-based method for the computation of fingerprint's Orienation Field is proposed. Our method mainly includes two procedures: the coarse level orientation computing, and the orientation predicting. In the first procedure, the effective point gradient vector and the new template are proposed for overcoming the limitation caused by normalization, and the contradiction between accuracy and robustness respectively; in the second procedure, an iteration based predicting method is adopted for improving the robustness against noise. Experiments prove the effectiveness of our method.
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