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

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...

AI Technical Summary

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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