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Method for identifying fingerprint facing image quality

A fingerprint identification and image quality technology, applied in the field of fingerprint identification, can solve the problem of poor compatibility of ideal and non-ideal fingerprint images

Inactive Publication Date: 2010-02-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a fingerprint identification method oriented to image quality in order to solve the shortcomings of existing fingerprint identification methods that are not good at both ideal and non-ideal fingerprint images.

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  • Method for identifying fingerprint facing image quality
  • Method for identifying fingerprint facing image quality
  • Method for identifying fingerprint facing image quality

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] figure 1 In , an image quality-oriented fingerprint recognition method, its steps are:

[0024] (1) The fingerprint image g(x, y) of the collection of reading, wherein g(x, y) is the gray value of pixel point (x, y);

[0025] (2) Extract the quality features of the fingerprint image, and extract the gradient consistency Q T , Spectral feature Q F , gray standard deviation Q s There are three characteristics;

[0026] (3) The three feature indicators extracted in step (2) form a three-dimensional feature vector, which is used as the input vector of the support vector machine; the SVM support vector machine classifier is used to learn and classify the quality of the fingerprint image, and it is determined as the Two quality types are defined;

[0027] (4) For two kinds of fingerprints with good quality and poor quality, the matching algorithm...

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Abstract

The invention discloses a fingerprint identifying method facing to the quality of an image, which solves the defect that the compatibility of the existing fingerprint identifying method to an ideal fingerprint image and a non ideal fingerprint image is not good. The method of the invention includes: (1) reading the collected fingerprint image g(x, y), wherein, g (x, y) is the gray value of the pixel points (x, y); (2) carrying out quality characteristic extracting on the fingerprint images and respectively extracting three characteristics of grads consistency QT, the frequency spectrum characteristic QF and the gray standard difference Qs; (3) adopting an SVM sorter to carry out learning and sorting on the qualities of the fingerprint images and confirming the qualities of the fingerprintimages as two defined quality types; (4) respectively adopting a matching arithmetic based on detail points and a matching arithmetic based on textures to the two fingerprints with better and poorer qualities to accomplish the identification.

Description

technical field [0001] The invention relates to a fingerprint identification method, in particular to an image quality-oriented fingerprint identification method. Background technique [0002] At present, in the automatic fingerprint identification technology, the image quality is an important factor affecting the identification performance. In the existing fingerprint identification processing methods, the minutiae points of the fingerprint image are usually obtained for matching, but the performance of this method drops significantly for images with poor quality. Other recognition methods, such as line-based and texture-based recognition methods, have certain effects on poor-quality images, but for better-quality images, not only the performance is not improved much, but the resources and time taken up are complicated. degree is relatively large. Therefore, there is an urgent need for a fingerprint recognition method that distinguishes image quality, which not only ensur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/66
Inventor 尹义龙杨公平骆功庆张宇詹小四任春晓
Owner SHANDONG UNIV