Method for extracting highlevel features for fingerprint recognition

摘要

A method to extract automatic high level features of a gray level ridge flow image including the automatic determination of the location of the high level features including the core and delta points of a fingerprint image in the form of a gray level image, comprising the following five steps:(1).determining a ridge flow direction of each gray level pixel of a fingerprint image and assign it with a direction code;(2).finding out a block directional flow and assigning each with appropriate direction code thereof;(3).correcting block flow directions in which a detection of the flow direction is affected image an input image quality in order to be immune from noises infiltrated during the acquiring process;(4).locating the delta points which are based on a corrected block direction flow diagram to locate from zero to a few delta points; and(5).locating the core points which are based on a corrected block direction flow diagram to locate one to two core points.