Fingerprint enhancement method and fingerprint identification device

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...

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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 feature points, laying the foundation for subsequent fingerprint feature extraction and fingerprint identification; the fingerprint identification device provided by the present invention utilizes the above-mentioned fingerprint enhancement method, and combines the processing structure of DSP and FPGA at the same time, which improves fingerprint identification efficiency and fingerprint storage. efficiency

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