JP5852507B2 - Vein authentication device and vein authentication method - Google Patents

Description

  The present invention relates to a technique for performing personal authentication using a vein pattern.

Since vein authentication uses a vein pattern inside the living body, it is said that forgery / tampering is more difficult than fingerprint authentication. In addition, among vein authentication, when using the finger vein pattern, the biometric authentication device can be downsized compared to other parts such as the iris, face, back of the hand, palm of the hand, etc. Easy to incorporate.
When the finger vein is irradiated with infrared light, the vein absorbs infrared light, but the part other than the vein transmits infrared light. By taking a picture, it is possible to take an image of a finger vein and use the vein pattern for authentication.

In Patent Document 1 shown below, the contour / region / vein shape / brightness / number of pixels of the finger are registered as key information together with the vein pattern, and the collation order of the registered vein pattern candidates is determined using the key information. A technique for performing authentication according to the collation order is disclosed.
Further, in Patent Document 2, a finger vein pattern and a finger wrinkle pattern are registered, and at the time of authentication, a wrinkle pattern is extracted from an image obtained by photographing the finger and collated with the registered wrinkle pattern. A technique for performing registration and authenticating a vein pattern is disclosed.

JP 2009-187520 A JP 2010-086241 A

  However, since the technique described in Patent Document 1 requires an image in which the outline of a finger is captured and an area having a width larger than the width of the finger needs to be secured, the finger photographing apparatus becomes large and authentication is performed. There is a problem that it is difficult to reduce the size of the apparatus. In addition, the technique described in Patent Document 2 uses the finger wrinkle pattern to align vein information in order to correct variations in how the finger is placed during authentication. In addition to taking a lot of time, there is a problem that authentication takes a lot of time because it is collated with a registered vein pattern.

  Accordingly, an object of the present invention is to provide a small vein authentication apparatus that can execute authentication at high speed.

In order to solve the above-described problem, the vein authentication device of the present invention provides :
A vein image processing unit for extracting vein information from a vein image obtained by photographing light transmitted through a finger irradiated with infrared light ;
A wrinkle image processing unit that extracts wrinkle information from a wrinkle image obtained by photographing light reflected from the finger irradiated with infrared light ;
An information registration unit that registers the vein information and the wrinkle information in association with each other ;
The wrinkle information extracted from the wrinkle image acquired by the imaging unit at the time of authentication is collated with the wrinkle information of the registration information, and the vein information of the registration information is based on the degree of similarity as a collation result. A matching order determination unit for determining the matching order ;
An authentication unit that collates the vein information extracted from the vein image acquired by the imaging unit at the time of authentication and the vein information of the registration information in the order determined by the collation order ;
When acquiring the vein image, the infrared light is irradiated after moving to a position to irradiate the side surface of the finger, and when acquiring the wrinkle image, the infrared light is moved to a position to irradiate the palm side of the finger. A light source that emits light;
It is characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, authentication can be performed at high speed and a high-speed and small vein authentication apparatus can be provided.

It is a figure which shows the function example of a vein authentication apparatus. It is a figure which shows the structural example of a vein authentication apparatus, (a) represents a structure perspective view, (b) represents sectional drawing. It is a figure which shows an example of the vein image and wrinkle image which are acquired by an imaging part, (a) represents a vein image, (b) represents a wrinkle image. It is a figure which shows the example of a processing flow which registers registration information. It is a figure which shows the example of a processing flow at the time of authentication. It is a figure which shows the modification of a structure of a vein authentication apparatus, (a) represents the case where a light source is moved, (b) represents the case where infrared light is reflected using a mirror.

  Next, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings as appropriate.

First, an example of functions of the vein authentication device 100 will be described with reference to FIG.
As illustrated in FIG. 1, the vein authentication device 100 includes a processing unit 10, a light source unit 20, an imaging unit 21, a storage unit 22, and an I / F (interface) unit 23.

  The processing unit 10 includes a CPU (Central Processing Unit) and a main memory (not shown), and each function of the processing unit 10 is realized by developing an application program (not shown) stored in the storage unit 22 in the main memory. The Details of each function of the processing unit 10 will be described later.

The light source unit 20 has a function of emitting infrared light. The light source unit 20 is controlled by the control unit 11 to emit light.
The imaging unit 21 acquires light transmitted through a finger irradiated with infrared light emitted from the light source unit 20 as a vein image, and is reflected from the finger irradiated with infrared light emitted from the light source unit 20. Has a function of acquiring (capturing) as a wrinkled image. The imaging unit 21 is controlled by the control unit 11 for acquisition (photographing).

  The storage unit 22 is a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), and stores registration information 22a that is registered in advance for verification at the time of authentication. The registration information 22a stores identification information 222, vein information 223, and wrinkle information 224 in association with each other. The identification information 222 is information for identifying a user used at the time of authentication, and is, for example, a name, an ID number, an account number, or the like. The vein information 223 is information related to the vein pattern extracted from the vein image. The wrinkle information 224 is information regarding a wrinkle pattern extracted from the wrinkle image.

  The I / F unit 23 is connected to an information processing apparatus (not shown) to transmit / receive information such as commands and data, or is connected to a display (not shown) to perform authentication and a message regarding an authentication result. And the like.

  Next, details of functions of the processing unit 10 will be described. The processing unit 10 includes a control unit 11, a vein image processing unit 12, a wrinkle image processing unit 13, an information registration unit 14, a collation order determination unit 15, and an authentication unit 16.

  The control unit 11 controls the functions of the units 12 to 16 of the processing unit 10 and also controls the light source unit 20 and the imaging unit 21, and stores information between the storage unit 22 and the I / F unit 23 and the processing unit 10. It has a function to control transmission and reception.

The vein image processing unit 12 has a function of extracting vein information 223 from the vein image acquired by the imaging unit 21.
The wrinkle image processing unit 13 has a function of extracting wrinkle information 224 from the wrinkle image acquired by the imaging unit 21.

When the user registers the vein information 223 and the wrinkle information 224, the information registration unit 14 associates the vein information 223 and the wrinkle information 224 with each other and stores them in the recording unit 22 as registration information 22a.
The collation order determination unit 15 collates the wrinkle information 224 acquired at the time of authentication with the wrinkle information 224 of the registration information 22a, calculates the similarity, and increases the collation order as the degree of similarity increases. It has a function of determining the collation order of the information 223. The collation order indicates that collation is performed in order from vein information 223 associated with wrinkle information 224 having a high degree of similarity. The similarity can be calculated using, for example, a known technique such as correlation calculation or likelihood calculation.

  The authentication unit 16 collates the vein information 223 acquired at the time of authentication with the vein information of the registration information 22a in the order determined by the collation order, calculates the similarity, and determines whether the authentication is successful based on the similarity It has the function to judge. The similarity can be calculated using, for example, a known technique such as correlation calculation or likelihood calculation. For example, the authentication unit 16 determines that the authentication is successful when the similarity is equal to or greater than a predetermined threshold.

Next, a configuration example of the vein authentication device 100 will be described with reference to FIG. 2 (see FIG. 1 as appropriate).
FIG. 2A is a configuration perspective view of the vein authentication device 100. Reference numeral 30 in FIG. 2A denotes a finger rest, which is an area on which a finger belly is placed. Reference numeral 31 denotes an irradiation window, and infrared light is emitted from the light source unit 20 to the finger. Reference numeral 32 denotes an imaging window, which is an area where the imaging unit 21 captures a finger vein image or a wrinkle image. The irradiation window 31 and the imaging window 32 are made of a material that transmits infrared light.

FIG.2 (b) is sectional drawing showing the AA cross section of Fig.2 (a). The same reference numerals in FIG. 2B denote the same parts as in FIG.
In FIG. 2B, reference numeral 20 (20a, 20b, 20c) represents the light source unit 20. When acquiring a vein image, infrared light is irradiated to the finger from the light source units (first light source units) 20a and 20b through the irradiation window 31, and the finger irradiated with the infrared light is transmitted by the imaging unit 21. The light that has been taken is photographed. When acquiring a wrinkle image, infrared light is irradiated from the light source unit (second light source unit) 20c through the imaging window 32 to the finger, and reflected by the imaging unit 21 from the finger irradiated with infrared light. The captured light is photographed.

  Here, an example of a vein image and a wrinkle image acquired by the imaging unit 21 will be described with reference to FIG. 3 (see FIG. 1 as appropriate). 3A shows a vein image, and FIG. 3B shows a wrinkle image.

  FIG. 3A shows a vein image showing the vein 303 of the finger 301 restricted by the imaging window 302. The vein image processing unit 12 extracts the pattern of the vein 303 as the vein information 223 from the vein image acquired by the imaging unit 21.

  FIG. 3B shows a wrinkle image in which the wrinkle 304 of the finger 301 restricted by the photographing window 302 is copied. The wrinkle image processing unit 13 extracts a wrinkle 304 pattern as wrinkle information 224 from the wrinkle image acquired by the imaging unit 21.

Here, the size of the photographing window 302 will be described. As can be seen from FIG. 3A, the width of the photographing window 302 is narrower than the width of the finger. Further, as can be seen from FIG. 3B, it is preferable that the longitudinal direction of the photographing window 302 is a length that allows photographing of both the first joint and the second indirect of the finger 301. However, due to size restrictions of the vein authentication device 100, the longitudinal direction of the imaging window 302 may be only one of the first joint and the second indirect of the finger 301.
That is, the vein authentication device 100 only needs to include the imaging window 32 smaller than the width of the finger, and thus can be reduced in size.

Next, an example of a processing flow for registering registration information will be described with reference to FIG. 4 (see FIGS. 1 and 2 as appropriate).
In step S401, the control unit 11 turns on the first light source unit (light source units 20a and 20b) and emits infrared light from the light source units 20a and 20b.
In step S402, the control unit 11 adjusts the light amount of the first light source unit so that a vein image can be easily acquired.

In step S403, the control unit 11 causes the imaging unit 21 to acquire a vein image.
In step S404, the control unit 11 turns off the first light source unit (light source units 20a and 20b).

  In step S405, the vein image processing unit 12 determines whether the vein image acquired in step S403 can be registered. For example, the vein image processing unit 12 determines that registration is not possible when only a part of the finger is shown in the acquired vein image or when the finger is separated from the finger rest 30 and the image is unclear. judge. If it is determined that registration is possible (Yes in step S405), the process proceeds to step S406. If it is determined that registration is not possible (No in step S405), the process proceeds to step S414.

In step S406, the vein image processing unit 12 extracts vein information 223 from the vein image.
In step S407, the information registration unit 14 registers the vein information 223 in the registration information 22a of the storage unit 22.

In step S408, the control unit 11 turns on the second light source unit (light source unit 20c) and emits infrared light from the light source unit 20c.
In step S409, the control unit 11 adjusts the amount of light of the second light source unit so that a wrinkle image can be easily acquired.

In step S410, the control unit 11 causes the imaging unit 21 to acquire a wrinkle image.
In step S411, the control unit 11 turns off the second light source unit (light source unit 20c).
In step S412, the wrinkle image processing unit 13 extracts wrinkle information 224 from the wrinkle image.

In step S413, the information registration unit 14 registers the wrinkle information 224 in the registration information 22a of the storage unit 22 in association with the vein information 223 registered in step S406.
In step S414, the control unit 11 determines that the registration has failed and ends the process. The control unit 11 may display a registration failure message on a display unit (not shown) via the I / F unit 23 when determining that the registration has failed.

Next, a processing flow example at the time of authentication will be described with reference to FIG.
Steps S501 to S504 are the same as steps S401 to S404 in FIG.

  In step S505, the vein image processing unit 12 determines whether the vein image acquired in step S503 can be authenticated. For example, the vein image processing unit 12 determines that authentication is not possible when only a part of the finger is shown in the acquired vein image or when the finger is separated from the finger rest 30 and the image is unclear. judge. If it is determined that authentication is possible (Yes in step S505), the process proceeds to step S506. If it is determined that authentication is not possible (No in step S505), the process proceeds to step S517.

Steps S506 to S511 are the same as steps S406 and S408 to S412 in FIG.
In step S512, the collation order determination unit 15 collates the wrinkle information 224 extracted in step S511 with the wrinkle information 224 registered in the registration information 22a. Specifically, the collation order determination unit 15 calculates the similarity between the wrinkle information 224 extracted in step S511 and the wrinkle information 224 registered in the registration information 22a.

In step S513, the collation order determination unit 15 determines the collation order. Specifically, the collation order determination unit 15 determines the collation order of the vein information 223 based on the similarity calculated in step S512 so that the higher the similarity is, the higher the collation order is.
In step S514, the authentication unit 16 collates the vein information 223 extracted in step S506 with the vein information 223 registered in the registration information 22a in the order determined in the collation order. Specifically, the authentication unit 16 calculates the similarity between the vein information 223 acquired at the time of authentication and the vein information 223 of the registration information 22a. Therefore, the vein authentication device 100 can increase the possibility of being determined as successful authentication at an early stage of collation executed based on the collation order, and can finish the authentication process at high speed.

  In step S515, the authentication unit 16 determines whether authentication is successful based on the similarity calculated in step S514. Specifically, the authentication unit 16 determines that the authentication is successful when the similarity is equal to or greater than a predetermined threshold. If it is determined that the authentication is successful (Yes in step S515), the process proceeds to step S516. If it is determined that the authentication is not successful (No in step S515), the process proceeds to step S517.

In step S516, the control unit 11 determines that the authentication is successful and ends the process. When determining that the authentication is successful, the control unit 11 may display an authentication success message on a display unit (not shown) via the I / F unit 23.
In step S517, the control unit 11 determines that the authentication has failed and ends the process. The control unit 11 may display an authentication failure message on a display unit (not shown) via the I / F unit 23 when determining that the authentication has failed.

Next, a modified example of the configuration of the vein authentication device 100 will be described with reference to FIG.
FIG. 6A illustrates a case where the light source unit 20a is moved to the position of the light source unit 20c when the imaging unit 21 acquires a wrinkle image. In this way, the number of light source units 20 can be reduced.

  FIG. 6B shows a case where the vein authentication device 100 includes a mirror 60. When the imaging unit 21 acquires a wrinkle image, the direction of the light source unit 20a can be changed, and infrared light can be reflected by the mirror 60 to replace the light source unit 20c. In addition, the dashed-dotted line 61 in FIG.6 (b) represents progress of infrared light. By doing in this way, the number of the light source parts 20 can be reduced, and the size of the vein authentication apparatus 100 can be reduced.

  As described above, the vein authentication device 100 of the present invention images a vein image obtained by photographing light transmitted through a finger irradiated with infrared light and light reflected from the finger irradiated with infrared light. An image capturing unit 21 that acquires a wrinkle image, a vein image processing unit 12 that extracts vein information from the vein image, a wrinkle image processing unit 13 that extracts wrinkle information from the wrinkle image, and vein information and wrinkle information are registered in association with each other. The information registration unit 14 registered as information 22a, the wrinkle information extracted from the wrinkle image acquired by the imaging unit 21 at the time of authentication, and the wrinkle information of the registration information 22a are collated, and the vein of the registration information 22a is based on the collation result. The collation order determination unit 15 that determines the collation order of information, and the vein information extracted from the vein image acquired by the imaging unit 21 and the registration information 22a in the order determined by the collation order An authentication unit 16 collates the vein information, characterized in that it comprises a. And since the vein authentication apparatus 100 performs verification for authentication in the order determined by the verification order, it is possible to complete the authentication processing at high speed. In addition, the vein authentication device 100 only needs to include the imaging window 32 that is smaller than the width of the finger, and thus can be downsized.

In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
In addition, each configuration, function, processing unit, and the like of the processing unit 10 may be realized by hardware by designing a part or all of them, for example, with an integrated circuit. In addition, each configuration, function, and the like of the processing unit 10 may be realized by software by the processor interpreting and executing a program that realizes each function. Information such as programs, tables, and files for realizing each function is stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), an IC (Integrated Circuit) card, an SD card, a DVD (Digital Versatile Disc), etc. Can be placed on a recording medium.
In addition, the control lines and information lines are those that are considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. In practice, it may be considered that almost all configurations are connected to each other.

DESCRIPTION OF SYMBOLS 10 Processing part 11 Control part 12 Vein image processing part 13 Wrinkle image processing part 14 Information registration part 15 Collation order determination part 16 Authentication part 20 (20a, 20b, 20c) Light source part 21 Imaging part 22 Storage part 30 Finger rest 31 Irradiation Window 32,302 Shooting window 60 Mirror 303 Vein 304 Wrinkle

Claims (4)

A vein image processing unit for extracting vein information from a vein image obtained by photographing light transmitted through a finger irradiated with infrared light;
A wrinkle image processing unit that extracts wrinkle information from a wrinkle image obtained by photographing light reflected from the finger irradiated with infrared light;
An information registration unit that registers the vein information and the wrinkle information in association with each other;
The wrinkle information extracted from the wrinkle image acquired by the imaging unit at the time of authentication is collated with the wrinkle information of the registration information, and the vein information of the registration information is based on the degree of similarity as a collation result. A matching order determination unit for determining the matching order;
An authentication unit that collates the vein information extracted from the vein image acquired by the imaging unit at the time of authentication and the vein information of the registration information in the order determined by the collation order;
When acquiring the vein image, the infrared light is irradiated after moving to a position to irradiate the side surface of the finger, and when acquiring the wrinkle image, the infrared light is moved to a position to irradiate the palm side of the finger. A light source that emits light;
A vein authentication device comprising: The imaging unit includes an imaging window for capturing the vein image and the wrinkle image,
The vein authentication apparatus according to claim 1 , wherein a width of the imaging window is smaller than a width of the finger. The vein authentication device according to claim 2 , further comprising an area on which the belly of the finger is placed. A vein authentication method for a vein authentication device that performs vein authentication,
The vein authentication device includes:
Move the light source to a position for irradiating the side of the finger by irradiating infrared light to the light source from extracts vein information from the infrared light captured the light transmitted through the finger irradiated vein image A vein image processing step;
Wrinkle information from a wrinkle image obtained by moving the light source to a position to irradiate the palm side of the finger and then irradiating the light source with infrared light and photographing light reflected from the finger irradiated with the infrared light Wrinkle image processing step to extract,
An information registration step for registering the vein information and the wrinkle information as registration information in association with each other;
The wrinkle information extracted from the wrinkle image acquired in the imaging step at the time of authentication is collated with the wrinkle information of the registration information, and the vein information of the registration information is based on the magnitude of similarity as a collation result A matching order determination step for determining the matching order of
An authentication step of collating the vein information extracted from the vein image acquired in the imaging step at the time of authentication with the vein information of the registration information in the order determined by the collation order;
The vein authentication method characterized by performing.

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