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Method for acquiring three-dimensional finger vein image based on binocular camera

A binocular camera, finger vein technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem of difficult to guarantee recognition accuracy, unfavorable 3D shape observation and understanding of venous blood vessels, system recognition rejection rate, false recognition The problem is that the rate is not ideal, so as to achieve the effect of convenient access, reducing human intervention and reducing the amount of calculation.

Pending Publication Date: 2020-12-15
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0003] At present, two-dimensional monocular finger vein images are mainly used in the market for finger vein recognition, which invisibly puts forward higher requirements for the recognition system, and the recognition accuracy is difficult to guarantee, and the rejection rate and false recognition rate of system recognition are often not ideal.
In addition, the information contained in 2D monocular finger vein images is often not as rich as 3D finger vein images, nor can it provide realistic visual effects for finger vein researchers, which is not conducive to researchers' observation and understanding of the 3D shape of veins

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  • Method for acquiring three-dimensional finger vein image based on binocular camera
  • Method for acquiring three-dimensional finger vein image based on binocular camera
  • Method for acquiring three-dimensional finger vein image based on binocular camera

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Embodiment Construction

[0054] In order to verify the feasibility and superiority of the method proposed by the present invention, the present invention will be further elaborated in conjunction with the application scenarios:

[0055] A method for obtaining a three-dimensional finger vein image based on a binocular camera, comprising the steps of:

[0056] Step 1, collecting finger vein images under binocular vision;

[0057] Use the binocular camera to obtain two finger vein images of the same finger of different testers;

[0058] Step 2, preprocessing the finger vein image;

[0059] The preprocessing of the finger vein image in the present invention mainly includes image grayscale, image bilateral filtering, image enhancement, image binarization and thinning of image finger vein lines;

[0060] (1) Grayscale of the image;

[0061] Utilize the weighted average method to carry out the grayscale processing to the color image of the finger vein; since the human eyes have different sensing strengths t...

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Abstract

The invention discloses a method for acquiring a three-dimensional finger vein image based on a binocular camera, and the method comprises the following steps: 1, collecting a finger vein image underbinocular vision, and obtaining two finger vein images of the same finger of different testees through the binocular camera; 2, preprocessing the finger vein image, wherein the preprocessing of the finger vein image mainly comprises image graying, image bilateral filtering, image enhancement, image binaryzation and image finger vein line refinement; 3, performing three-dimensional reconstruction on the two-dimensional finger vein image, including (1) acquiring internal and external parameters of a binocular camera by using a Zhang calibration method; (2) performing epipolar correction by usingthe rotation matrix; (3) obtaining a disparity map through stereo matching; and (4) performing three-dimensional reconstruction on the finger vein image. According to the invention, the calculation amount is reduced, the accurate and detailed disparity map can be rapidly and conveniently obtained, and the method can be well used for finger vein recognition.

Description

technical field [0001] The invention relates to a method for acquiring a three-dimensional finger vein image based on a binocular camera. [0002] technical background [0003] At present, two-dimensional monocular finger vein images are mainly used in the market for finger vein recognition, which invisibly puts forward higher requirements for the recognition system, and the recognition accuracy is difficult to guarantee, and the rejection rate and false recognition rate of system recognition are often not ideal. In addition, the information contained in 2D monocular finger vein images is often not as rich as that of 3D finger vein images, nor can it provide realistic visual effects for finger vein researchers, which is not conducive to researchers' observation and understanding of the 3D shape of veins. Contents of the invention [0004] In view of the above problems, the present invention proposes a method for acquiring three-dimensional finger vein images based on a bino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/90G06T7/80G06T7/593G06T7/33G06T7/136G06T5/40G06T5/20
CPCG06T7/90G06T5/20G06T5/40G06T7/136G06T7/85G06T7/337G06T7/593G06T2207/20028G06T2207/30101G06T2207/10012
Inventor 冯定忠陈威慧张烨李衎樊一超
Owner ZHEJIANG UNIV OF TECH
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