Fingerprint image enhancement method based on knowledge

Abstract

The fingerprint image enhancement method based on knowledge includes the steps: image pre-treatment; direction field estimation to calcualte the direction of each pixel in fingerprint image; binarization to change fingerprint image into black-white image according to pixel direction; fining the binary image; detail post-treatment to eliminate burr, spot and bridge in fined image to avoid pseudo detail; feedback enhacement with the knowledge rules; and extracting detail points including crest line end points. The said technology can be used to extract the details in fingerprint image and has important application value in biological recognition.

Description

technical field

[0001] The invention relates to pattern recognition, in particular to a method of utilizing image filtering and knowledge of direction field to realize enhanced processing of fingerprint image. Background technique

[0002] In the 1960s, with the continuous advancement of computer technology and information processing and identification technology, people began to use computers to process fingerprints, and launched automatic fingerprint identification systems (Automated Fingerprint Identification System, referred to as AFIS) in many countries around the world. Research and application in law enforcement. In the 1990s, with the further development of computer and pattern recognition technology, the application of automatic fingerprint recognition is no longer limited to the field of law and public security. It can be used as a means for computers to confirm users, and can also be used as an information security technology for accessing network resources. . I...

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