Fingerprint enhancement method and fingerprint recognition device

A fingerprint and fingerprint image technology, applied in the field of image processing, can solve the problems of poor enhancement effect and large amount of calculation

Active Publication Date: 2014-04-09
GUANGXI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a fingerprint enhancement method and a fingerprint identification device. The fingerprint enhancement algorithm overcomes the defects of large calculation amount and poor enhancement effect of the prior art fingerprint enhancement algorithm, and enhances the denoising ability by combining Gabor filtering and Gaussian difference. , reducing false f

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  • Fingerprint enhancement method and fingerprint recognition device
  • Fingerprint enhancement method and fingerprint recognition device

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Experimental program
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Embodiment 1

[0074] like figure 1 As shown, the fingerprint enhancement method provided in this embodiment includes the following steps:

[0075] A. Normalize the fingerprint image to obtain a normalized fingerprint image, and calculate the continuous direction map of the normalized fingerprint image;

[0076] The specific steps of the step A are as follows:

[0077] A1. Normalize the fingerprint image to obtain a normalized fingerprint image, so that the gray scale of the fingerprint image has the same mean and variance;

[0078] A2. Divide the direction map: the reference point is located in the center of the direction template, the horizontal position is taken as the starting direction, and a direction is determined every π / 8 according to the reverse time direction, respectively using i=0,1,2,..., 7 to indicate that the calculated direction angle range is [0, π);

[0079] A3. Calculate the average gray value of each pixel in each direction in the normalized image

[0080] A4. Divi...

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Abstract

The invention aims to provide a fingerprint enhancement method. The fingerprint enhancement method includes the following steps that A, a fingerprint image is normalized to obtain a normalized fingerprint image, and the continuous directional diagram of the fingerprint image is calculated; B, a fingerprint enhancement image is obtained after the normalized fingerprint image is subjected to Gabor filtration, and an initial filtering image is obtained by recombining a continuous directional diagram; C, Gaussian blur is performed on the initial filtering image to obtain a Gaussian blur image, and Gaussian difference is performed on the Gaussian blur image to obtain a Gaussian difference image; D, after being mapped in the opposite direction, the Gaussian difference image is reconstructed to obtain a final filtering image. The invention further provides a fingerprint recognition device. According to the fingerprint enhancement algorithm, the Gabor filtering and the Gaussian difference are combined, and thus the denoising capacity is enhanced, and the defects that an existing fingerprint enhancement algorithm is large in calculation amount and poor in enhancement effect are overcome. Through the fingerprint enhancement method, the fingerprint recognition device is combined with the processing structure of a DSP and the processing structure of an FPGA, and thus the fingerprint recognition efficiency and the fingerprint storage efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to fingerprint recognition processing technology. Background technique [0002] Biometric identification technology is a solution that uses automatic technology to measure the characteristics of the body or the behavior characteristics of individuals for identity verification, and compares these characteristics or characteristics with the templates in the database to complete the authentication. As the most mature and convenient member of biometric technology, fingerprint recognition technology has been successfully applied in various fields of society. Such as: access control, attendance system, e-commerce, ATM automatic teller machine and criminal identification system, etc. [0003] In the automatic fingerprint identification system, fingerprint image enhancement is a key technology. The purposes of fingerprint image enhancement are: (1) smoothing noise, (2) improving t...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 林川陈飞龙谭光兴潘盛辉曹以隽吴正茂林聪
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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