Living fingerprint capturer

Abstract

The invention relates to a living fingerprint capturer comprising an optical fingerprint imaging module and a fingerprint signal processing module, wherein the optical fingerprint imaging module comprises a light source, a prism, an imaging objective lens and an image sensor module which are arranged along an optical path; the image sensor module comprises an image sensor; the prism is a pentaprism comprising a sampling surface and an illuminating surface which are mutually parallel and over against as well as an imaging surface opposite to the imaging objective lens, and the rest surfaces of the pentaprism are all coated with shading layers; the light source is arranged below the illuminating surface of the pentaprism; and a diffusion membrane is arranged between the illuminating surface of the pentaprism and the light source. The invention has the advantages of good optical imaging quality, low false alarm rate, overall automatic induction control, and the like.

Description

Technical field [0001] The invention relates to a biological identification technology, in particular to a living fingerprint collector. Background technique [0002] Fingerprint recognition is a biometric method for identity confirmation and verification based on the biological characteristics of individual living fingerprints. Fingerprint collection is precisely the core of this biometric method. The process of fingerprint collection is essentially the process of fingerprint imaging. The principle is to draw a fingerprint image based on the geometric, physical and biological characteristics of ridges and ridges to obtain different feedback signal values, and then compare the fingerprint images to determine whether they are The effective user fingerprint has achieved the purpose of security identification. [0003] One of the most common methods in fingerprint collection currently is to use optical acquisition and imaging, which transfers fingerprint optical information to a phot...

AI Technical Summary

Problems solved by technology

[0005] (1) The design of the optical path is unreasonable, and the quality of fingerprint optical imaging is poor, which makes it difficult for valid user fingerprints to be safely identified, which brings inconvenience to the normal use of users;

[0006] (2) In terms of design, in order to reduce the energy consumption of the collection device, the fingerprint collection device should be in a dormant state when there is no finger contact, and the collection device will automatically turn on when the finger approaches. The sensor control mechanism that is close to automatic opening is more complicated or the sensor sensitivity is poor. Usually, the finger of the human body needs to be deliberately close to the sensor point to start the fingerprint collection device, which fails to realize all-round automatic sensor control. Other commercially available fingerprint collection devices need to use It can only be started by pressing the open button, which has a low degree of automation and is inconvenient to operate. Especially in some occasions that require fingerprint collection and identification with a large amount of data, it is a waste of precious time to turn on and off the button repeatedly.

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