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Fingerprint and vein double biological feature extraction optical imaging system

An optical imaging system and biometric technology, which is applied in the field of biometric feature extraction system, fingerprint and vein dual biometric feature extraction optical imaging system, can solve the problem that fingerprint feature extraction system cannot extract fingerprint and vein feature at the same time.

Active Publication Date: 2018-09-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: the existing fingerprint feature extraction system cannot extract fingerprint and vein feature simultaneously; For realizing the above technical purpose, the technical scheme of the present invention is as follows:

Method used

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  • Fingerprint and vein double biological feature extraction optical imaging system
  • Fingerprint and vein double biological feature extraction optical imaging system
  • Fingerprint and vein double biological feature extraction optical imaging system

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Embodiment 1

[0027] An optical imaging system for fingerprint and vein dual biometric feature extraction, its working waveband is 400nm-700nm and 840nm-860nm, the system F number is F / #=2.86, and the object-image conjugate distance is 96.78mm.

[0028] See attached figure 1 , which is a structural diagram of the fingerprint and vein dual biometric feature extraction system provided in this embodiment; it includes a collection area, an optical imaging system and a sensor receiving area, the collection area is composed of a white LED light source 11 in the collection area, and a transparent flat glass 12 in the collection area , the near-infrared LED light source 13 in the collection area is made up; the optical imaging system is composed of the first positive lens 21 of the optical imaging system, the second positive lens 22 of the optical imaging system, the first negative lens 23 of the optical imaging system, and the first negative lens 23 of the optical imaging system. Two negative lens...

Embodiment 2

[0040] A fingerprint lock including the fingerprint and vein dual biometric feature extraction system described in the above technical solution, the fingerprint lock can simultaneously extract fingerprint and vein information at the fingerprint.

[0041] The technical solution can also be applied to other anti-theft devices or identification systems.

[0042] The invention proposes a specific design for extracting fingerprints and vein biometric features only by using a single optical imaging system, adopts a coaxial design, has a simple and compact structure, and is suitable for mass production. Fingerprint features can be extracted in the visible light band and vein features can be extracted in the near-infrared band at the same time. The imaging quality of both bands is close to the diffraction limit, which meets the imaging quality requirements.

[0043] In order to further reduce the cost, the surfaces of all the lenses mentioned above are spherical.

[0044] In order to...

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Abstract

The invention belongs to the technical field of optics, and relates to a fingerprint and vein double biological feature extraction optical imaging system which is capable of operating at a visible light waveband and a near-infrared waveband at the same time and adopts an active optical imaging mode, wherein a white light LED (Light-Emitting Diode) light source and a near-infrared LED light sourceare adopted to respectively perform surface-type lighting and lateral-transmission-type lighting on a to-be-detected object, then a fingerprint image and a vein image are acquired by the optical imaging system at the same time, and the fingerprint image and the vein image are received by a follow-up sensor after an infrared filter. The fingerprint and vein double biological feature extraction optical imaging system is based on a double gaussian structure, and adopts a coaxial transmission type structure, so that small-volume optical imaging is achieved through few optical lenses, in comparisonwith a conventional system, the volume is greatly reduced, thus the optical imaging system has the characteristic of simple and compact structure; in addition, focusing performances of the optical imaging system at various field positions of double wavebands are all close to a diffraction limit, thus the optical imaging system has the advantages of small distortion, high energy concentration rate, uniform image surface illumination distribution and so on; and extraction of double biological features consisting of fingerprint and vein can be completed at the same time, thus the optical imagingsystem also has the advantage of high security.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a biometric feature extraction system, in particular to an optical imaging system for dual biometric feature extraction of fingerprints and veins that adopts a coaxial transmission structure and can work simultaneously in visible light bands and near-infrared bands. Background technique [0002] Today, with the rapid development of information technology, information security is particularly important, but the widely used fingerprint identification is no longer foolproof, it is easy to forge and is easily affected by the external environment. The vein is an internal feature of the human body, which is difficult to forge and can only be collected under living conditions. And the feature points of the two are located at the same position, which is easy to obtain. Therefore, a multi-mode recognition technology for fingerprints and veins is proposed. [0003] However, most of the cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G07C9/00G02B13/00G02B13/14G02B13/18
CPCG02B13/00G02B13/14G02B13/18G07C9/00563G06V40/1324G06V40/10G06V40/14
Inventor 季轶群赵迪迪
Owner SUZHOU UNIV
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