关键词: 指纹识别, 方向场, 方向一致性, 中心点

Abstract: Proposed a method to detect the core point and its orientation from fingerprint image.Through using hierarchical analysis of the orientation coherence，picked out the points of low orientation coherence，then utilized poincare index to distinguish the style of the low orientation coherence points.After the style have been distinguished，developed a new algorithm to confirm the orientation of the core point，through using the orientation information of a cirque，the centre of a cirque is the core point.Experimented in FVC2002 fingerprint database，result show that this method detect core point correctly and quickly，orientation of core point is precision and fastness，have the ability to defeat the noise，it can badly conform the request of fingerprint alignment.

Key words: fingerprint recognition, orientation filed, orientation coherence, core point