WO2019128463A1

WO2019128463A1 - Venous image acquisition device

Info

Publication number: WO2019128463A1
Application number: PCT/CN2018/113645
Authority: WO
Inventors: 黄永峰; 胡星; 赵飞; 龚文川
Original assignee: 广州广电运通金融电子股份有限公司
Priority date: 2017-12-27
Filing date: 2018-11-02
Publication date: 2019-07-04
Also published as: CN108073907A

Abstract

A venous image acquisition device. A main body is provided with an opening for incidence of natural light. A second polarizer is provided at the opening. A hole is provided at a side surface of the main body for inserting an acquisition object. An infrared light source is provided within the main body and emits infrared light to illuminate the acquisition object inserted into the hole. An imaging assembly is provided within the main body, and receives infrared light transmitting through the acquisition object, so as to perform venous imaging. The first polarizer is provided within the main body, located between the imaging assembly and the hole, and polarizes the infrared light and first polarized light directed toward the imaging assembly, the first polarized light being polarized light generated by a second polarizer polarizing the natural light. The polarization directions of the first polarizer and the second polarizer form a pre-determined non-parallel angle. The invention solves the technical problems in which a user using a top-lit venous image acquisition apparatus cannot see the position of their own fingers during use, and a side-lit venous image acquisition apparatus causes overexposure of a venous image.

Description

Vein image acquisition device

The present application claims priority to Chinese Patent Application, filed on Jan. 27, PCT-------.

Technical field

The present invention relates to the field of identity verification technologies, and in particular, to a vein image acquisition device.

Background technique

With the continuous advancement of society and the urgent requirements for fast and effective automatic authentication, biometrics technology has developed rapidly in recent decades.

As an intrinsic attribute of human beings, and with strong self-stability and individual differences, biometrics become an ideal basis for automatic authentication. Current biometric recognition technologies mainly include: fingerprint recognition, retina recognition, iris recognition, gait recognition, vein recognition and face recognition.

The vein recognition technology achieves the purpose of identity verification by collecting images of veins in the fingers or palms and performing living body recognition on the vein images. It has high anti-counterfeiting, in vivo detection, high accuracy, adaptability and ease of use.

The existing vein image acquisition device can be divided into two types: upper lighting and side lighting from the light source lighting structure. The light source of the upper light vein image acquisition device is above the finger. In order to avoid the influence of external light on the finger vein image, an opaque cover is generally arranged above the finger, but this makes the user unable to see the position of the finger when using the device, which seriously affects the use experience. The light source of the side-lighting vein image acquisition device is on one side or both sides of the finger, and an opaque cover is not disposed above the finger. Under external illumination, there is a problem of over-exposure of the vein image.

Summary of the invention

The invention provides a vein image collecting device, which solves the technical problem that the upper light vein image collecting device can cause the user to use the finger position and the side light vein image collecting device can cause the vein image to be overexposed.

The invention provides a vein image acquisition device, comprising: a main body, an imaging component, an infrared light source, a first polarizer and a second polarizer;

The body is provided with an opening for natural light to be incident, and the second polarizer is disposed at the opening;

The side of the main body is provided with an opening for the object to be collected;

The infrared light source is disposed in the main body for emitting infrared light to irradiate the object to be collected placed from the opening;

The imaging component is disposed in the body for receiving infrared light transmitted through the object to be collected for imaging of a vein image;

The first polarizer is disposed in the body and is located between the imaging component and the opening for polarizing the infrared light and the first polarized light that are incident on the imaging component The first polarized light is polarized light generated by the natural light being polarized by the second polarizer;

The polarization directions of the first polarizer and the second polarizer are non-parallel preset angles.

Preferably, the vein image acquisition device further comprises an infrared filter disposed between the imaging assembly and the opening.

Preferably, the infrared filter is disposed between the first polarizer and the imaging assembly.

Preferably, the first polarizer is disposed between the infrared filter and the imaging assembly.

Preferably, the first polarizer is attached to the infrared filter.

Preferably, the first polarizer is disposed at or suspended between the infrared filter and the imaging assembly.

Preferably, when the object to be collected is a finger, the polarization direction of the first polarizer is set to be perpendicular to the direction of the finger knuckle placed.

Preferably, the polarizer is a linear polarizer or a circular polarizer.

Preferably, the polarizing plate is made of glass or resin.

Preferably, the surface of the first polarizer is provided with an infrared anti-reflection film for enhancing the transmittance of infrared light emitted by the infrared light source.

As can be seen from the above technical solutions, the present invention has the following advantages:

After the object to be collected is placed in the body, the natural light is irradiated onto the object to be collected through the second polarizer, and the user can see the position of the finger through the second polarizer; the infrared light source emits infrared light, and the infrared light is transmitted through the object to be collected. And passing through the first polarizer to form a vein image in the imaging assembly; the infrared light does not pass through the second polarizer, and the natural light is first polarized by the second polarizer to become the first polarized light, the first polarized light When passing through the first polarizer, since the polarization directions of the first polarizer and the second polarizer are non-parallel preset angles, the first polarized light is filtered by the first polarizer and cannot enter the imaging assembly. Therefore, there is no problem of overexposure of the vein image; therefore, the vein image acquisition device of the present invention does not need to be provided with an opaque cover, and solves the technical problem that the upper photon vein image acquisition device may not be able to see the position of the finger when the user uses it. The user experience is improved, and natural light is not incident on the imaging component, which solves the technical problem that the side-lighting vein image acquisition device may cause the vein image to be overexposed.

DRAWINGS

1 is a schematic structural view of a first embodiment of a vein image acquisition device according to the present invention;

2 is a schematic view showing a comparison of a polarization direction of a first polarizer and a polarization direction of a second polarizer;

3 is a schematic view showing a relative direction of a polarization direction of a first polarizer and a finger streak direction.

4 is a schematic diagram of an optical path of a first embodiment of a vein image acquisition device according to the present invention;

FIG. 5 is a schematic diagram of an optical path of a second embodiment of a vein image acquisition device according to the present invention; FIG.

6 is a schematic diagram of an optical path of a third embodiment of a vein image acquisition device according to the present invention;

FIG. 7 is a schematic diagram of an optical path of a fourth embodiment of a vein image acquisition device according to the present invention; FIG.

FIG. 8 is a schematic diagram of an optical path of a fifth embodiment of a vein image acquisition device according to the present invention; FIG.

FIG. 9 is a schematic diagram of an optical path of a sixth embodiment of a vein image acquisition device according to the present invention; FIG.

FIG. 10 is a schematic diagram of an optical path of a seventh embodiment of a vein image acquisition device according to the present invention.

Detailed ways

In order to make the object, the features and the advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 1 , which is a schematic structural diagram of a first embodiment of a vein image acquisition device provided by the present invention.

The present invention provides an embodiment of a vein image acquisition device comprising: a body 7, an imaging assembly 1, an infrared source 5, a first polarizer 2, and a second polarizer 3.

The main body 7 is provided with an opening 8 for natural light to be incident, and the second polarizing plate 3 is disposed at the opening 8.

This embodiment does not limit the shape and size of the opening 8.

It can be understood that the natural light enters the object to be collected from the opening 8 and is reflected into the human eye, so that the position of the object to be collected 6 is seen from the opening 8 when the user uses it.

The second polarizing plate 3 is disposed at the opening 8 such that the natural light becomes the first polarized light after being deflected by the second polarizing plate 3 upon entering the main body 7.

The side of the main body 7 is provided with an opening for the object to be collected 6 to be placed. It should be noted that the opening is not shown in FIG.

The collection object can be any part where a vein image can be collected, such as a finger or a palm.

It should be noted that although the side of the main body 7 is provided with an opening, natural light can be transmitted, but when the object to be collected 6 is placed, the influence of natural light can be ignored.

The infrared light source 5 is disposed in the main body 7 for emitting infrared light to illuminate the object to be collected 6 placed from the opening.

The infrared source 5 can be an infrared LED source.

The specific position of the infrared light source 5 is not specifically limited in this embodiment, as long as it can be irradiated to the object to be collected 6 and imaged in the imaging assembly 1, for example, it can be disposed obliquely above the object to be collected 6 as shown in FIG. It can also be placed directly above the object to be collected 6.

The imaging assembly 1 is disposed in the main body 7 for receiving infrared light transmitted through the object to be collected 6 to perform vein image imaging. As shown in FIG. 1, the imaging assembly 1 may be disposed at the bottom in the main body 7.

Imaging assembly 1 includes, but is not limited to, a lens and a sensor.

The first polarizing plate 2 is disposed in the main body 7 and located between the imaging assembly 1 and the opening for polarizing the infrared light and the first polarized light that are incident on the imaging assembly 1. The first polarized light is natural light. Polarized light generated after the second polarizer is deflected;

The polarization directions of the first polarizer 2 and the second polarizer 3 are non-parallel preset angles.

In order to optimize the filtering effect of the first polarized light, the preset angle may be set to 90 degrees. For details, please refer to FIG. 2, the polarization direction of the first polarizing plate 2 and the polarization direction of the second polarizing plate 3 are compared. schematic diagram.

It should be noted that the infrared light that is irradiated onto the object to be collected 6 does not pass through the second polarizing plate 3, and the natural light first passes through the second polarizing plate 3 to become the first polarized light, and the first polarized light reaches the first. In the polarizing plate 2, since the polarization directions of the first polarizing plate 2 and the second polarizing plate 3 are non-parallel preset angles, the first polarized light is filtered out when passing through the first polarizing plate 2, so that Entering the imaging assembly 1, there is no problem with overexposure of the vein image.

Further, the vein image acquisition device further includes an infrared filter 4 disposed between the imaging assembly 1 and the opening.

In this embodiment, the infrared filter 4 may be disposed between the first polarizer 2 and the imaging assembly 1; as shown in FIG. 1, the first polarizer 2 may also be disposed on the infrared filter 4 and imaged. Between components 1.

The function of the infrared filter 4 is to filter the light, for example, to filter out the non-infrared light in the weak natural light entering from the opening, thereby effectively ensuring the quality of the vein image.

Please refer to FIG. 3, which is a schematic diagram of the relative directions of the polarization direction of the first polarizer 2 and the direction of the finger knuckles.

Further, when the object to be collected 6 is a finger, the polarization direction of the first polarizing plate 2 is set to be perpendicular to the direction of the finger knuckle placed.

The inventors have found in the research that the vein image collected by the vein image collecting device in the embodiment is usually bright at the finger streak, so the polarization direction of the first polarizing plate 2 can be adjusted according to the angle at which the finger is placed. Designed to be perpendicular to the direction of the finger's knuckles, it can reduce the transmittance of infrared light at the finger knuckles and improve the brightness uniformity of the finger vein image.

Further, the polarizing plate (referring to the first polarizing plate and the second polarizing plate) may be a linear polarizer or a circular polarizer, and the polarizing plate may be made of glass or resin.

Further, an infrared anti-reflection film is disposed on the surface of the first polarizer 2 for enhancing transmittance to infrared light.

The embodiment of the invention improves the imaging quality of the vein image under the strong light condition by preventing the over-exposure of the vein image, improving the brightness uniformity of the finger vein image, and improving the transmittance of the first polarizer 2 to the infrared light. The reduction algorithm is difficult to identify the vein image, and the ease of use of the finger vein device under strong light conditions is increased.

Since there are many options for the arrangement position of the infrared light source 5, there are two cases in which the imaging module 1, the infrared filter 4, and the first polarizing film 2 are arranged in order. Therefore, in order to facilitate understanding of the technical solution of the present invention, the following The embodiments of the present invention are specifically described.

Please refer to FIG. 4 , which is a schematic diagram of an optical path of a first embodiment of a vein image acquisition device provided by the present invention.

In the present embodiment, the first polarizer 2 is suspended between the infrared filter 4 and the imaging assembly 1, that is, the first polarizer 2 is neither in contact with the imaging assembly 1 nor in contact with the infrared filter 4. The infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6, although the infrared light source 5 shown in FIG. 4 has two and is distributed obliquely above both sides of the object to be collected 6, but it may be only in the object to be collected 6 An infrared light source 5 is disposed above one side.

Please refer to FIG. 5 , which is a schematic diagram of an optical path of a second embodiment of a vein image acquisition device provided by the present invention.

In the second embodiment, the first polarizing plate 2 is suspended between the infrared filter 4 and the imaging assembly 1 and disposed at the imaging assembly 1, and the infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6, although The infrared light source 5 shown in FIG. 5 has two and is disposed obliquely above both sides of the object to be collected 6, but it is also possible to provide the infrared light source 5 only on the side of the object 6 to be collected.

Please refer to FIG. 6 , which is a schematic diagram of an optical path of a third embodiment of a vein image acquisition device provided by the present invention.

In the third embodiment, the first polarizer 2 is suspended between the infrared filter 4 and the imaging assembly 1, and is neither in contact with the imaging assembly 1 nor in contact with the infrared filter 4.

The infrared light source 5 is disposed between the object to be collected 6 and the second polarizing plate 3, for example, may be disposed directly above the object to be collected 6; for ease of installation, the infrared light source 5 may be directly disposed on the lower surface of the second polarizing plate 3. Since the infrared light source 5 is small in volume compared with the second polarizing plate 3, the user can still see the position of the object 6 to be collected through the second polarizing plate 3.

Please refer to FIG. 7 , which is a schematic diagram of an optical path of a fourth embodiment of a vein image acquisition device provided by the present invention.

In the fourth embodiment, the first polarizer 2 is suspended between the infrared filter 4 and the imaging assembly 1 and disposed at the imaging assembly 1, and the infrared source 5 is located between the object 6 to be collected and the second polarizer 3. For example, it may be disposed directly above the object to be collected 6; for ease of installation, the infrared light source 5 may be directly disposed on the lower surface of the second polarizing plate 3 because the infrared light source 5 is very bulky compared to the second polarizing plate 3. Small, so the user can still see the position of the object to be collected 6 through the second polarizing plate 3.

Please refer to FIG. 8 , which is a schematic diagram of an optical path of a fifth embodiment of a vein image acquisition device provided by the present invention.

In the fifth embodiment, the infrared filter 4 is disposed between the first polarizer 2 and the imaging assembly 1. Specifically, the infrared filter 4 and the first polarizer 2 may be disposed in abutting manner.

Please refer to FIG. 9 , which is a schematic diagram of an optical path of a sixth embodiment of a vein image acquisition device provided by the present invention.

The infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6. Although the infrared light source 5 shown in FIG. 9 has two and is distributed obliquely above the two sides of the object to be collected 6, it may be only in the object to be collected 6 An infrared light source 5 is disposed above the side.

Please refer to FIG. 10 , which is a schematic diagram of an optical path of a seventh embodiment of a vein image acquisition device provided by the present invention.

In the seventh embodiment, when the infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6, the first polarizing plate 2 may be disposed on the side of the infrared light source 5 close to the object to be collected 6, and other structures and connection relationships are The same as the sixth embodiment, the specific description can be referred to the sixth embodiment.

The above is a detailed description of the structure and connection mode of a vein image acquisition device. For ease of understanding, an application of a vein image acquisition device will be described below in a specific application scenario, and the application examples include:

As shown in FIG. 1, the infrared light source 5 is disposed on both sides of the inner wall of the main body 7. When the finger is placed in the main body 7, the two infrared light sources 5 are respectively located obliquely above the finger, and the infrared light source 5 emits infrared light, so that the infrared light is transmitted through the to-be-collected. The object 6 passes through the infrared filter 4 and the first polarizer 2 to form a vein image in the imaging unit 1.

The natural light passes through the second polarizer to become the first polarized light, and the first polarized light is irradiated onto the object to be collected 6 and reflected into the human eye, so that the user can see the position of the collected object when using.

When the first polarized light reaches the first polarizer 2, since the polarization directions of the first polarizer 2 and the second polarizer 3 are non-parallel preset angles, the natural light passes through the first polarizer 2 It is filtered out so that it cannot enter the imaging unit 1, so there is no problem of overexposure of the vein image.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A vein image collecting device, comprising: a main body, an imaging component, an infrared light source, a first polarizing plate and a second polarizing plate;

The body is provided with an opening for natural light to be incident, and the second polarizer is disposed at the opening;

The side of the main body is provided with an opening for the object to be collected;

The infrared light source is disposed in the main body for emitting infrared light to irradiate the object to be collected placed from the opening;

The imaging component is disposed in the body for receiving infrared light transmitted through the object to be collected for imaging of a vein image;

The first polarizer is disposed in the body and is located between the imaging component and the opening for polarizing the infrared light and the first polarized light that are incident on the imaging component The first polarized light is polarized light generated by the natural light being polarized by the second polarizer;

The polarization directions of the first polarizer and the second polarizer are non-parallel preset angles.
The vein image collection device of claim 1 further comprising an infrared filter disposed between said imaging assembly and said aperture.
The vein image collection device according to claim 2, wherein the infrared filter is disposed between the first polarizer and the imaging unit.
The vein image collection device according to claim 2, wherein the first polarizer is disposed between the infrared filter and the imaging unit.
The vein image collection device according to claim 3, wherein the first polarizer is attached to the infrared filter.
The vein image collection device according to claim 4, wherein the first polarizer is disposed at or suspended between the infrared filter and the imaging assembly.
The vein image collection device according to claim 1, wherein when the object to be collected is a finger, the polarization direction of the first polarizer is set to be perpendicular to the direction of the finger knuckle placed.
The vein image collecting device according to any one of claims 1 to 7, wherein the first polarizing plate and the second polarizing plate are linear polarizers or circular polarizers.
The vein image collecting device according to any one of claims 1 to 7, wherein the first polarizing plate and the second polarizing plate are made of glass or resin.
The vein image collecting device according to any one of claims 1 to 7, wherein the surface of the first polarizer is provided with an infrared anti-reflection film for enhancing infrared light emitted from the infrared light source. Transmittance.