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Finger vein recognition method and system

A technology of finger veins and recognition methods, applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, instruments, etc., can solve problems such as uneven image quality, and achieve the effect of enhancing texture features

Inactive Publication Date: 2019-08-23
CHINA UNIV OF GEOSCIENCES (WUHAN)
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AI Technical Summary

Problems solved by technology

[0003] In the process of finger vein recognition or verification, due to unstable illumination when collecting vein images, the rotation of fingers may lead to uneven image quality. Therefore, an algorithm that is more robust to errors caused by illumination and finger rotation is needed. Finger vein recognition can be applied in real life

Method used

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  • Finger vein recognition method and system
  • Finger vein recognition method and system

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Embodiment Construction

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0040] Such as figure 1 , figure 2 Shown, a kind of finger vein recognition method comprises the following steps:

[0041] S1. Determine the upper and lower edge point sets of the finger area in the original image, refine the edge to a pixel width, and place the finger area in the original image horizontally;

[0042] The specific process is as follows:

[0043] S11. Obtain the edge point set a. If the difference between the gray value of the current pixel point and the gray value of the two pixels above it is more than 33, the pixel point is determined to be an edge point.

[0044] S12. Obtain the edge point set b, and use the Sobel operator to calculate the gradient of the entire image. When the gradient of the current pixel exceeds the gradient va...

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Abstract

The invention discloses a finger vein recognition method and system, and the method comprises the steps: determining an upper edge point set and a lower edge point set of a finger region, and refiningthe edge to a pixel width; selecting appropriate points from the refined edge point set for edge expansion to obtain a real edge point set; correcting the rotation of the finger according to the obtained pixel coordinates, and setting the background gray value to be 0; obtaining the ROI, wherein the width is selected to be 0.73 time that of the original image, the lowest edge coordinate is selected when the upper edge is intercepted, and the uppermost edge coordinate is selected for height interception when the lower edge is intercepted; performing histogram equalization and Gabor filtering on the ROI; extracting an ROI from 3816 pieces of 636 types of vein images, and storing the ROI; during matching, using a one vs n method, and calculating the similarity scores of the two ROI images in the zero-mean normalization direction, the range is 0-1, the closer the numerical value is to 1, the higher the similarity degree is, and the main body to which the image with the highest similaritydegree with the to-be-matched image belongs is judged as the main body of the to-be-matched image.

Description

technical field [0001] The invention relates to the technical fields of image processing and biological feature recognition, in particular to a finger vein recognition method and system. Background technique [0002] Finger vein recognition is a kind of biometric recognition technology. Finger vein recognition technology is based on the characteristics of blood flow that can absorb characteristic wavelength relationships. Using near-infrared light to irradiate fingers, images of invading finger veins can be captured. Because the characteristics of finger veins are difficult to be copied, and the characteristics of each person's finger veins are different, and they will hardly change with age. Therefore, finger vein recognition technology has the characteristics of living body recognition, high security, and uniqueness. , Hotel management, government agencies, prison access control, medical appraisal, etc. have great application prospects. [0003] In the process of finger v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/32
CPCG06V40/12G06V40/1347G06V10/243G06V10/25
Inventor 黄田野张科定程卓
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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