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Effective fingerprint direction field calculating method

A calculation method and directional field technology, applied in computing, computer parts, instruments, etc., can solve the problems of weak anti-noise ability and lack of availability.

Inactive Publication Date: 2013-11-27
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0005] The existing gradient-based fingerprint direction field calculation method has weak anti-noise ability, although some follow-up processing can be added to the algorithm to enhance the anti-noise ability, and achieved certain results, but for fingerprint images with poor quality, especially It is an image with a large area of ​​noise, and still cannot get a more ideal result

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Embodiment Construction

[0044] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0045] The effective fingerprint direction field calculation method provided by the present invention comprises the following steps:

[0046] Step 1 read in a sheet such as figure 1 As shown in the fingerprint image, the entire fingerprint image is specified according to formula (1),

[0047] N ( x , y ) = M 0 + V 0 ...

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Abstract

The invention discloses a direction field estimation implementation method aiming at a fingerprint noise area for fingerprint images with large area of a noise area. The effective fingerprint direction field calculating method provided by the invention comprises the steps of: calculating fingerprint direction fields in non-noise areas by adopting a gradient-based method firstly, and marking a noise area according to parameters such as efficient point gradient vector ratio and direction consistency; and estimating a direction field of the noise area by adopting an 8-directional interval predicting model on the basis of the calculated direction fields of the non-noise areas. Since the impact on a current point of 8 different directional intervals is considered, the estimated direction field result is more reasonable. In addition, the scheme of gradual contraction from outside to inside is adopted when estimating the direction field of the noise area, and the accuracy of prediction is further improved.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, in particular to the technical field of automatic fingerprint identification, and more specifically relates to a fingerprint direction field calculation method. Background technique [0002] Biometric identification technology is a technology for identification based on each person's unique biological and behavioral characteristics that can be sampled and measured. Because biometric features are not as easy to steal as various certificates, nor are they as easy to forget or crack as passwords and passwords, so they have unique advantages in identification and have been widely studied internationally in recent years. Automated Fingerprint Identification System (AFIS) is more and more popular due to its small size, low cost, easy operation and high reliability, and has become one of the most important biometric technologies. [0003] The direction field describes the direction pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 梅园周宇
Owner NANJING UNIV OF INFORMATION SCI & TECH