A reflective five-finger vein and fingerprint collection device

Abstract

The present application provides a reflective five-finger vein and fingerprint collection device, comprising: a substrate, a palm support, a light-emitting module and an imaging module; the palm support, the light-emitting module and the imaging module are respectively arranged on the substrate, and each of the light-emitting modules comprises a plurality of near-infrared lamps, a first near-infrared polarizer and a plurality of fingerprint fill-in lamps; the imaging module comprises an infrared light lens, a visible light lens, a second near-infrared polarizer, a band-pass filter, an infrared light image sensor and a visible light image sensor; the reflective five-finger vein and fingerprint collection device of the present application arranges the palm support, the light-emitting module and the imaging module on the substrate respectively, so that the imaging module can collect five finger veins and fingerprints at the same time, thereby improving the collection efficiency; the light intensity of the non-finger vein area on the finger surface can be attenuated, thereby eliminating the reflection phenomenon on the finger surface, reducing the influence of ambient light, and improving the imaging quality of the finger vein.

Description

Technical Field

[0001] The present application belongs to the field of biometric technology, and more specifically, to a reflective five-finger vein and fingerprint collection device. Background Art

[0002] Finger vein detection uses the property of human hemoglobin absorbing near-infrared light when passing through veins to collect vein images under the skin of the finger and extract them as biometric features. Compared with other biometric technologies such as fingerprints, irises or hand shapes, finger vein detection is extremely difficult to copy and forge. The biggest reason is that this biometric feature is under the skin of the finger and cannot be seen by the naked eye. In addition, since finger vein detection is contactless, it is more hygienic and suitable for use in public places. At the same time, it is more natural to use the finger, making it easier for users to accept.

[0003] According to relevant research data, when the wavelength is 760nm, the absorption of near-infrared light by reduced hemoglobin is the strongest, when the wavelength is 850nm, the absorption of near-infrared light by reduced hemoglobin and oxyhemoglobin is equal, and when the wavelength is 940nm, the absorption of near-infrared light by oxyhemoglobin is the strongest. Therefore, near-infrared light with wavelengths of 760nm, 850nm, and 940nm was selected to shoot five fingers, respectively, to obtain high-quality finger vein images.

[0004] In the application of finger vein recognition, how to obtain high-contrast, high-information, high-quality finger vein images is an important issue. Due to the differences in individual finger biological tissues, the thickness of fat in different people's fingers, the reflectivity of the skin surface, the protein content, etc., the degree of penetration of near-infrared light into the skin will be affected, resulting in poor quality of finger vein images taken by some people. In addition, the veins and fingerprints of each finger need to be collected separately, which has low collection efficiency. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a reflective five-finger vein and fingerprint acquisition device to solve the technical problems of poor image quality and low acquisition efficiency in the prior art in the process of biometric acquisition.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in this application is: to provide a reflective five-finger vein and fingerprint collection device, including: a substrate, a palm support, a light-emitting module and an imaging module;

[0007] The palm support, the light-emitting module and the imaging module are respectively arranged on the substrate, and at least five light-emitting modules are arranged, each of which includes a plurality of near-infrared lamps, a first near-infrared polarizing plate and a plurality of fingerprint fill-in lamps, wherein the first near-infrared polarizing plate is covered on the plurality of near-infrared lamps, and the plurality of fingerprint fill-in lamps are arranged on one side of the near-infrared lamps;

[0008] The imaging module includes an infrared light lens, a visible light lens, a second near-infrared polarizer, a bandpass filter, an infrared light image sensor and a visible light image sensor. The infrared light lens, the second near-infrared polarizer, the bandpass filter and the infrared light image sensor are coaxially and stacked in sequence, and the visible light lens is arranged on the visible light image sensor.

[0009] Preferably, the plurality of near-infrared lamps are divided into near-infrared lamps with a wavelength of 760 nm, near-infrared lamps with a wavelength of 850 nm and near-infrared lamps with a wavelength of 940 nm, and the near-infrared lamps with three wavelengths are arranged at intervals from each other.

[0010] Preferably, the light emitting module further comprises a light intensity adjustment unit, and the light intensity adjustment unit is electrically connected to the plurality of near-infrared lamps respectively.

[0011] Preferably, the polarization directions of the first near-infrared polarizers are the same, and the angle between the polarization direction of the second near-infrared polarizer and the polarization directions of the first near-infrared polarizers is between 60 degrees and 90 degrees.

[0012] Preferably, the bandpass filter is a filter with a bandwidth of 750nm to 1100nm.

[0013] Preferably, the light emitted by the fingerprint fill light is blue light or green light.

[0014] Preferably, the imaging module also includes a base plate, a middle frame and a face frame, the infrared image sensor and the visible light image sensor are arranged on the base plate, the middle frame is arranged on the base plate and surrounds the infrared image sensor and the visible light image sensor, and the infrared lens, the second near-infrared polarizer, and the bandpass filter are fixed between the middle frame and the face frame.

[0015] Preferably, the imaging module further includes a transparent protective plate, and the transparent protective plate is arranged between the middle frame and the surface frame.

[0016] Preferably, a plurality of finger-joint fixing positions are arranged on the palm support, and the plurality of finger-joint fixing positions are arranged at intervals from each other.

[0017] Preferably, a plurality of anti-slip grooves are provided on the palm support.

[0018] Compared with the prior art, the reflective five-finger vein and fingerprint collection device provided by the present application has the advantages that the palm support, the light-emitting module and the imaging module are respectively arranged on the substrate, so that the imaging module can collect the five-finger veins and fingerprints at the same time, thereby improving the collection efficiency; the infrared light emitted by the near-infrared lamp passes through the first near-infrared polarizer, the infrared light lens, the second near-infrared polarizer and the bandpass filter in sequence, which can attenuate the light intensity of the non-finger vein area on the finger surface, eliminate the reflection phenomenon on the finger surface, reduce the influence of ambient light, and improve the imaging quality of the finger vein; the visible light emitted by the fingerprint fill light directly irradiates the five fingers, and the visible light is reflected back to the visible light lens, and finally formed on the visible light image sensor, thereby improving the fingerprint recognition rate and security. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the reflective five-finger vein and fingerprint collection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] Please also read Figure 1 Now, the reflective five-finger vein and fingerprint collection device 100 provided in the embodiment of the present application is described. The reflective five-finger vein and fingerprint collection device 100 comprises: a substrate 10, a palm support 20, a light emitting module 30 and an imaging module 40.

[0026] Specifically, the palm support 20, the light emitting module 30 and the imaging module 40 are respectively arranged on the substrate 10, and at least five light emitting modules 30 are arranged. Each light emitting module 30 includes a plurality of near-infrared lamps 31, a first near-infrared polarizer 32 and a plurality of fingerprint fill-in lights 33. The first near-infrared polarizer 32 is covered on the plurality of near-infrared lamps 31, and the plurality of fingerprint fill-in lights 33 are arranged on one side of the near-infrared lamp 31.

[0027] Specifically, the imaging module 40 includes an infrared light lens, a visible light lens, a second near-infrared polarizer, a bandpass filter, an infrared light image sensor and a visible light image sensor. The infrared light lens, the second near-infrared polarizer, the bandpass filter and the infrared light image sensor are coaxially and stacked in sequence, and the visible light lens is arranged on the visible light image sensor.

[0028] It is understandable that when the reflective five-finger vein and fingerprint collection device 100 collects the five-finger veins and fingerprints of a person, the palm support 20 can support the palm of the person so that the fingers remain stable and shaking can be reduced. The light-emitting modules 30 are preferably provided with five. When the five fingers are straightened, each finger is just located on a corresponding light-emitting module 30 to improve the imaging quality of each finger.

[0029] When collecting the veins of the five fingers, the infrared light emitted by the near-infrared lamp 31 first passes through the first near-infrared polarizer 32, and then irradiates the five fingers. Human hemoglobin can absorb the near-infrared light when passing through the veins on the five fingers, and the light part that is not absorbed on the five fingers will be reflected to the imaging module 40, and pass through the infrared light lens, the second near-infrared polarizer, the bandpass filter and the infrared light image sensor in sequence.

[0030] The polarization direction of the second near-infrared polarizer and the polarization direction of each of the first near-infrared polarizers 32 may form a preset angle to attenuate the light intensity in the non-finger vein area of ​​the finger surface and eliminate the reflection phenomenon on the finger surface.

[0031] Among them, the bandpass filter can be selected to be a model corresponding to the wavelength of the near-infrared lamp 31 to ensure that the infrared light emitted by the near-infrared lamp 31 can be transmitted, while at the same time filtering the infrared light of the ambient light to avoid interference from the ambient light and further improve the imaging quality of the palm vein.

[0032] When collecting fingerprints of five fingers, the visible light emitted by the fingerprint fill light 33 directly irradiates the five fingers, and the visible light is reflected back to the visible light lens, and finally forms an image on the visible light image sensor, thereby realizing the collection of fingerprints of five fingers while collecting veins of five fingers.

[0033] It is worth noting that, unlike conventional fingerprint collectors, when collecting fingerprints through the reflective five-finger vein and fingerprint collection device 100, five fingerprints can be collected at the same time, which is still effective even for special people with incomplete fingers and unclear fingerprints.

[0034] In addition, the fingerprint described in this technical solution refers to the fingerprint of the entire finger, which includes all the textures on the fingertips and knuckles. Therefore, compared with traditional fingerprint recognition devices, the fingerprint recognition rate is improved and it is even more difficult to imitate.

[0035] Compared with the prior art, the reflective five-finger vein and fingerprint acquisition device 100 provided in the present application has the advantages that the palm support 20, the light-emitting module 30 and the imaging module 40 are respectively arranged on the substrate 10, so that the imaging module 40 can simultaneously acquire five-finger veins and fingerprints, thereby improving the acquisition efficiency; the infrared light emitted by the near-infrared lamp 31 passes through the first near-infrared polarizer 32, the infrared light lens, the second near-infrared polarizer and the bandpass filter in sequence, which can attenuate the light intensity of the non-finger vein area on the finger surface, eliminate the reflection phenomenon on the finger surface, reduce the influence of ambient light, and improve the imaging quality of the finger vein; the visible light emitted by the fingerprint fill light 33 directly irradiates the five fingers, and the visible light is reflected back to the visible light lens, and finally imaged on the visible light image sensor, thereby improving the fingerprint recognition rate and security.

[0036] In another embodiment of the present application, the plurality of near infrared lamps 31 are divided into near infrared lamps 31 with a wavelength of 760 nm, near infrared lamps 31 with a wavelength of 850 nm, and near infrared lamps 31 with a wavelength of 940 nm, and the near infrared lamps 31 with three wavelengths are arranged at intervals from each other.

[0037] It is understandable that the combination of three wavelengths of infrared light sources, 760nm, 850nm, and 940nm, can adapt to the differences in finger biological tissues of different people and obtain high-quality finger vein images. The basic idea of ​​multispectral finger vein imaging is that different individuals absorb near-infrared light differently, and combining multiple wavelengths of light can achieve more accurate collection.

[0038] Furthermore, the light emitting module 30 further includes a light intensity adjustment unit (not shown), and the light intensity adjustment unit is electrically connected to the plurality of near-infrared lamps 31 .

[0039] It is understandable that the light intensity adjustment unit is preferably pulse width modulation. Pulse width modulation is an analog control method that modulates the bias of the transistor base or the MOS tube gate according to the change of the corresponding load to achieve the change of the transistor or MOS tube conduction time, thereby achieving the change of the output of the switching regulated power supply. The light intensity of each wavelength of the near-infrared lamp 31 can be adjusted by the light intensity adjustment unit. Each wavelength of light is divided into N brightness levels, so there are N*N*N light intensity ratio combinations. Each of these combined lights takes a picture, so that high-quality finger vein pictures can be selected. For example, each light is divided into 4 brightness levels, and there are 4*4*4=64 light intensity ratio combinations. The finer the light, the more accurate the captured image.

[0040] In another embodiment of the present application, the polarization directions of the first near-infrared polarizers 32 are the same, and the angle between the polarization direction of the second near-infrared polarizer and the polarization directions of the first near-infrared polarizers 32 is between 60 degrees and 90 degrees.

[0041] It can be understood that, since the polarization directions of the first near-infrared polarizers 32 are the same, the first near-infrared polarizers 32 are combined into a polarization array to keep the direction of the infrared light consistent. When the angle between the polarization direction of the second near-infrared polarizer and the polarization direction of the first near-infrared polarizers 32 is between 60 degrees and 90 degrees, the reflection of the non-palm vein part of the finger can be effectively eliminated, the contrast of the finger vein imaging is improved, it is more conducive to algorithm processing, and the false recognition rate and rejection rate of the finger vein are improved.

[0042] It is worthwhile to add that, using the principle of polarized light, when the angle between the polarization direction of the second near-infrared polarizer and the polarization direction of the first near-infrared polarizers 32 is between 60 degrees and 90 degrees, the larger the angle, the more obvious the elimination of the reflection of the non-palm vein part of the finger, and the higher the contrast, but considering the imaging effect, it needs to be set according to the light intensity of the near-infrared lamp 31. Preferably, the angle between the polarization direction of the second near-infrared polarizer and the polarization direction of the first near-infrared polarizers 32 is 75 degrees.

[0043] In another embodiment of the present application, the bandpass filter is a filter with a bandwidth of 750nm to 1100nm.

[0044] It is understandable that in order to transmit infrared light of three wavelengths of 760nm, 850nm and 940nm and filter out interference from visible light, the infrared light lens needs to be equipped with a bandpass filter to further reduce interference from ambient light.

[0045] In another embodiment of the present application, the light emitted by the fingerprint fill light 33 is blue light or green light.

[0046] It is understandable that by shooting the images of five fingers under blue light or green light, the information of five fingerprints can be obtained more clearly at the same time compared with white light. The biometric information of five finger veins and five finger fingerprints can be collected at the same time, so that the device can be used even if there are missing fingers.

[0047] In another embodiment of the present application, the imaging module 40 also includes a base plate, a middle frame and a face frame, the infrared image sensor and the visible light image sensor are arranged on the base plate, the middle frame is arranged on the base plate and surrounds the infrared image sensor and the visible light image sensor, and the infrared lens, the second near-infrared polarizer, and the bandpass filter are fixed between the middle frame and the face frame.

[0048] It can be understood that the bottom plate, the middle frame and the face frame provide three-dimensional support for the infrared light lens, the visible light lens, the second near-infrared polarizer, the bandpass filter, the infrared light image sensor and the visible light image sensor, thereby maintaining relative stability and improving shock resistance and service life.

[0049] In another embodiment of the present application, the imaging module 40 further includes a transparent protective plate, and the transparent protective plate is mounted between the middle frame and the surface frame.

[0050] The entire imaging module 40 can be protected by the transparent protective plate to prevent the lens from being contaminated, scratched, or vibrated.

[0051] In another embodiment of the present application, please refer to Figure 1 The palm support 20 is provided with a plurality of finger gap fixing positions 21, and the plurality of finger gap fixing positions 21 are arranged at intervals from each other.

[0052] It is understandable that the plurality of the finger gap fixing positions 21 need to be arranged according to ergonomics, that is, the spacing between adjacent finger gap fixing positions 21 is slightly larger than the width of a normal person's finger. The number of the finger gap fixing positions 21 is preferably 4, and each of the finger gap fixing positions 21 can be located in four finger gaps, respectively.

[0053] In another embodiment of the present application, please refer to Figure 1 The palm support 20 is provided with a plurality of anti-slip grooves 22 .

[0054] It can be understood that the surface friction of the palm support 20 can be improved by a plurality of anti-slip grooves 22, so that when collecting the veins and fingerprints of the five fingers, the five fingers remain stable and have an anti-slip effect.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A reflective five-finger vein and fingerprint collection device, used for contactless collection of five-finger veins and five-finger fingerprints, wherein the five fingers include fingertips and knuckles, and characterized in that: include: Base plate, palm support, light emitting module and imaging module; The palm support, the light-emitting module and the imaging module are respectively arranged on the substrate, and at least five light-emitting modules are arranged, each of which includes a plurality of near-infrared lamps, a first near-infrared polarizing plate and a plurality of fingerprint fill-in lamps, wherein the first near-infrared polarizing plate is covered on the plurality of near-infrared lamps, and the plurality of fingerprint fill-in lamps are arranged on one side of the near-infrared lamps; The imaging module comprises an infrared light lens, a visible light lens, a second near-infrared polarizer, a bandpass filter, an infrared light image sensor and a visible light image sensor, wherein the infrared light lens, the second near-infrared polarizer, the bandpass filter and the infrared light image sensor are coaxially and sequentially stacked, and the visible light lens is arranged on the visible light image sensor; the imaging module further comprises a bottom plate, a middle frame and a surface frame, wherein the infrared light image sensor and the visible light image sensor are arranged on the bottom plate, the middle frame is arranged on the bottom plate and surrounds the infrared light image sensor and the visible light image sensor, and the infrared light lens, the second near-infrared polarizer and the bandpass filter are fixed between the middle frame and the surface frame; The near-infrared lamps are divided into near-infrared lamps with a wavelength of 760nm, near-infrared lamps with a wavelength of 850nm and near-infrared lamps with a wavelength of 940nm, and the near-infrared lamps with three wavelengths are arranged at intervals from each other; The light-emitting module also includes a light intensity adjustment unit, which is electrically connected to several of the near-infrared lamps respectively. The light intensity adjustment unit is pulse width modulation, and the light intensity of each wavelength of the near-infrared lamp is adjusted by the light intensity adjustment unit. Each wavelength of light is divided into N brightness levels.

2. The reflective five-finger vein and fingerprint collection device as claimed in claim 1, characterized in that: The polarization directions of the first near-infrared polarizers are the same, and the angle between the polarization direction of the second near-infrared polarizer and the polarization directions of the first near-infrared polarizers is between 60 degrees and 90 degrees.

3. The reflective five-finger vein and fingerprint collection device as claimed in claim 2, characterized in that: The bandpass filter is a filter with a bandwidth of 750nm to 1100nm.

4. The reflective five-finger vein and fingerprint collection device according to any one of claims 1 to 3, characterized in that: The light emitted by the fingerprint fill light is blue light or green light.

5. The reflective five-finger vein and fingerprint collection device as claimed in claim 1, characterized in that: The imaging module also includes a transparent protection plate, and the transparent protection plate is mounted between the middle frame and the surface frame.

6. The reflective five-finger vein and fingerprint collection device according to any one of claims 1 to 3, characterized in that: The palm support is provided with a plurality of finger-joint fixing positions, and the plurality of finger-joint fixing positions are arranged at intervals from each other.

7. The reflective five-finger vein and fingerprint collection device according to any one of claims 1 to 3, characterized in that: The palm support is provided with a plurality of anti-slip grooves.

Images