Method for matching finger vein feature points

A technology of finger vein feature and matching method, applied in the field of biometrics, can solve the problem of low recognition rate and accuracy

Inactive Publication Date: 2018-03-30
SHENZHEN CASTLE SECURITY TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a matching method of finger vein feature points, which is based on the position and angle information of the minutiae points, and improves the problem of low recognition rate and accuracy caused by the displacement or rotation of the finger vein image

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  • Method for matching finger vein feature points

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Embodiment Construction

[0041] A method for matching finger vein feature points according to the present invention will be described with reference to the accompanying drawings.

[0042] Such as figure 1 As shown, a matching method of finger vein feature points includes the following steps:

[0043] Step 1: extract the feature points of the finger vein image, and calculate the position and angle information of the feature points;

[0044] Step 2: Compare the position and angle information of the feature point, center each extracted feature point, and give the feature vector that saves the three detail points of endpoint, bifurcation point and double bifurcation point, and perform template matching;

[0045] Step 3: Perform polar coordinate transformation on the feature vector described in step 2 to complete the matching of minutiae points.

[0046] Preferably, when template matching is performed, the feature vectors corresponding to each feature point do not need to be rotated and normalized.

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Abstract

The invention discloses a method for matching finger vein feature points, which comprises the steps of 1, extracting a feature point of a finger vein image, and calculating location information and angle information of the feature point; 2, comparing the location information and the angle information of the feature point, performing center positioning on each extracted feature point, providing a feature vector storing three types of detail points such as end points, bifurcation points and double bifurcation points, and not requiring to perform rotation normalization processing on a template for matching; and 3, performing polar coordinate transformation on the feature vector in the step 2 so as to complete detail point matching. The beneficial effects lie in that the method is based on thelocation information and the angle information of the detail points, so that a problem of low recognition rate caused by displacement or rotation of the vein image is improved.

Description

technical field [0001] The invention relates to the field of biometric identification, in particular to a method for matching finger vein feature points. Background technique [0002] In the field of finger vein recognition, feature point matching is a very important link. The matching method and accuracy of feature points determine the speed and accuracy of the final search. [0003] Improving the matching accuracy is an important part of image matching in the existing matching methods, and scholars at home and abroad have done a lot of research work in this area. Image matching technology is mainly divided into image pixel-based methods and vein feature-based methods. The pixel-based method directly calculates the pixel gray level difference between two images. It is believed that the pixel gray level difference of the same part should be higher than that of different parts. The difference should be small, this method is simple and intuitive, but the amount of calculation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/10G06V40/14
Inventor 曾尧唐忞旻龙安川
Owner SHENZHEN CASTLE SECURITY TECH CO LTD
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