关键词: 指纹, 奇异点, 方向场

Abstract: Authors introduce a new feature called Orientation Abundance Degree（OAD） based on fingerprint’s orientation segmentation，and propose an effective method for detection of fingerprint’s SP by using OAD.In this method，fingerprint’s orientation is partitioned into a series of non-overnapping homogeneous areas firstly；then SPs are rapidly localized through edges detection of homogeneous areas and end-points extraction of edges；finally，the types of SPs are distinguished according to the Poincare Index value.Compared with the Poincare Index method（PI），experiments on FVC2002 show that：for the performance of accuracy，the False Detecting Ratio（FDR） of our method is much lower than PI’s FDR，and the Missed Detecting Ratio（MDR） is a little higher than PI’s MDR；for the performance of practicality，our method owns obvious superiority，the speed of our method is 14.2 times faster than PI.

Key words: fingerprint, singular point, orientation field