JP2012073905A - Biometric authentication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biometric authentication device reducing time for authentication.SOLUTION: A biometric authentication device 10 has: setting data storage unit 14 for storing at least one piece of information concerning an operating condition of an apparatus and a body of a target person that are used for creating collation information as setting data in association with personal identification information or the collation information; and a setting unit 31 for reading out the setting data based on personal identification information input at authentication or the collation information determined by the input personal identification information, then based on a result of comparison between the read setting information with position information of the body, setting at least a part of the read setting information in a biometric authentication information acquiring unit 12 to acquire the biometric authentication information.

Description

  The present invention relates to a technique for authenticating an individual using biometric information.

  In order to protect important corporate information and personal information, biometric personal authentication technology is used in various places. Biometric authentication using information on human physical characteristics (biological organs) and behavioral characteristics (癖) is never forgotten or lost like a key. Also, depending on the characteristics used for authentication, there is no other person who has the same thing, and there is a property that it does not change even with age. And, since physical characteristics and behavioral characteristics (biometric authentication information) are difficult to duplicate or counterfeit, personal authentication technology using biometric authentication has attracted attention.

Examples of the physical features include fingerprints, palm prints, palm shapes, retinas, irises, faces, veins, voice prints, ear shells, and the like. Examples of behavioral features include handwriting, keystrokes, and blinking.
For body surface information such as fingerprints, the pattern may be forged by resin or the like, but because the vein is an internal organ, it is difficult to forge the pattern.

In addition, a biometric authentication device using a finger vein is easy to miniaturize and can be incorporated in various places. Therefore, by incorporating the finger vein authentication device into the entrance / exit of the security area or the locker, personal authentication can be performed without using a key.
For example, Patent Document 1 discloses a technique for optimizing the amount of light emitted from a light source based on a captured finger vein image and performing vein pattern enhancement processing in image calculation for authentication.

JP 2002-92616 A JP 2010-113433 A

Patent Document 1 describes a method of adjusting the light amount by confirming whether or not a vein pattern is imaged at the time of imaging in order to prevent a decrease in the authentication rate.
However, the finger that is the object of the finger vein authentication device has large individual differences in length and thickness.
Therefore, in the method of Patent Document 1, after taking an image with a certain initial light amount and confirming whether or not the vein pattern has been imaged, the light amount is increased or decreased if the image is not successfully captured. The feedback is repeated until the vein pattern is optimally imaged. In this method, since imaging is started from a state in which it is not known what kind of finger is to be imaged, the number of times of feedback of the light amount increases, and authentication time is required.

Patent Document 2 records shooting conditions such as the influence of the light quantity, focus, and external light of a biometric sensor adjusted when acquiring biometric information at the time of registration, and sets the recorded information at the time of authentication to perform shooting. Thus, there is described a method for reducing the repetition of feedback of biometric information acquisition at the time of authentication.
However, when acquiring the biometric information at the time of authentication, because thus the optimal operating conditions of the living body sensor the positional relationship between the imaging element and the object in a time authentication during registration is shifted is changed, similarly to Patent Document 1 Feedback is repeated until the vein pattern is optimally imaged, and the number of times of feedback of the light amount increases, which requires authentication time.

In addition, when an unspecified number of people frequently register and authenticate vein patterns, such as station lockers and fitness gym lockers, they may image unique fingers and repeat feedback such as the amount of light. As a result, authentication time is required.
On the other hand, when authentication is performed in a state where vein patterns have been registered, such as attendance management and entrance / exit management in the security area, if authentication time is required, traffic congestion will occur to wait for authentication. .

  Accordingly, an object of the present invention is to provide a biometric authentication device characterized in that the authentication time is shortened in order to solve the above-described problems.

  In order to solve the above problems, a biometric authentication device according to the present invention acquires biometric authentication information for biometric authentication from the body of a subject to be authenticated, and a biometric information acquisition unit that detects the position of the body; A storage unit that stores information for collation with the acquired biometric authentication information in association with personal identification information for individually identifying the target person, and an input unit for inputting the personal identification information And an authentication unit that performs personal authentication by comparing information for verification corresponding to personal identification information input via the input unit and biometric authentication information acquired by the biometric authentication information acquisition unit The biometric authentication device, wherein the personal identification information or the verification information is set as at least one of use conditions of the device used when creating the verification information and information on the subject's body Vs. The setting data is read based on the setting data storage unit stored and the personal identification information input at the time of authentication or the verification information specified by the personal identification information. A setting unit configured to acquire the biometric authentication information by setting at least a part in the biometric authentication information acquisition unit, wherein the authentication unit is configured to acquire a biometric from biometric authentication information acquired from the biometric authentication information acquisition unit. A position information detection unit that acquires position information; and the setting data storage unit includes, as one of the setting data, position information of the living body when the information for verification is acquired, and the authentication unit Is to compare the position information of the living body when the information for verification is acquired and the position information of the living body at the time of authentication to calculate the amount of change in the position of the living body, When the change amount of the biometric position is equal to or less than a predetermined threshold value, the individual using the biometric authentication information acquired in a state where setting data other than the biometric position information is set in the biometric authentication information acquiring unit It is characterized by performing authentication.

  According to the present invention, it is possible to reduce the time required for personal authentication using biometric information.

It is a figure which shows the hardware constitutions of the finger vein authentication apparatus of 1st Embodiment. It is explanatory drawing of the finger vein authentication apparatus of 1st Embodiment. (A) is a top view which shows the external appearance of a finger vein authentication apparatus. (B) is sectional drawing of a finger vein authentication apparatus. It is a functional block diagram of the finger vein authentication device of the first embodiment. It is a flowchart of the registration procedure of the vein pattern in the finger vein authentication apparatus of 1st Embodiment. It is a flowchart of the authentication procedure of the vein pattern in the finger vein authentication apparatus of 1st Embodiment. It is a figure which shows the hardware constitutions of the finger vein authentication apparatus of 2nd Embodiment. It is explanatory drawing of the finger vein authentication apparatus of 2nd Embodiment. (A) is a top view which shows the external appearance of a finger vein authentication apparatus. (B) is sectional drawing of a finger vein authentication apparatus. It is a flowchart of the registration procedure of the vein pattern in the finger vein authentication apparatus of 2nd Embodiment. It is a flowchart of the authentication procedure of the vein pattern in the finger vein authentication apparatus of 2nd Embodiment. It is a figure which shows the hardware constitutions of the finger vein authentication apparatus of 3rd Embodiment. It is a flowchart of the registration procedure of the vein pattern in the finger vein authentication apparatus of 3rd Embodiment. It is a flowchart of the authentication procedure of the vein pattern in the finger vein authentication apparatus of 3rd Embodiment.

Hereinafter, a mode for carrying out the present invention (referred to as “the present embodiment”) will be described in detail with reference to the drawings. Further, in all the drawings for explaining the present embodiment, the same parts are denoted by the same reference numerals in principle, and the repeated explanation thereof is omitted.
A finger vein authentication device using a finger vein will be described as an example of a biometric authentication device.

<< first embodiment >>
(Overview)
The finger vein authentication device 10 images a vein pattern using a difference in infrared light absorption rate between a blood vessel (blood) and another tissue. The vein pattern is expressed white (brightly) in a portion where the amount of absorption of infrared light is small or a portion that transmits infrared light. On the other hand, the vein portion where the amount of infrared light absorption is large and the peripheral portion of the finger where infrared light is difficult to reach are imaged black (dark) because the amount of infrared light is small.
Thereby, the outline of the finger and the vein inside the finger can be recognized.

(Hardware configuration)
FIG. 1 is a diagram illustrating a hardware configuration of the finger vein authentication device 10 according to the first embodiment.
The finger vein authentication device 10 (biometric authentication device) includes an input device 10-1, a processor 11, an imaging device 12, an infrared light emitting device 13 (light emitting device), a memory 14 (storage device), and an external I / F (InterFace). The device 15 includes an audio output device 16, a video output device 17, and a touch sensor device 20. These are connected to each other via a bus (not shown).

The input device 10-1 is, for example, a card reader or a numeric keypad, and transmits information input from the user to the processor 11.
The processor 11 performs various processes by executing a program stored in the memory 14.
The imaging device 12 is a CCD (Charge Coupled Devices) camera, for example, and images a user's body (a living body such as a finger).
The infrared light emitting device 13 is, for example, an infrared LED (Light Emitting Diode), and irradiates light on the finger 70 (see FIG. 2) for vein imaging.
The memory 14 stores a program executed by the processor 11. The memory 14 stores a verification template.

The external I / F device 15 is connected to an external device such as a personal computer (not shown) via a communication line.
The voice output device 16 generates an error sound or a voice guide message, for example, to alert the user or the administrator or guide the user to the correct operation.
The video output device 17 is a liquid crystal display, for example, and displays an error message or a guide message to alert the user or administrator or to guide the user to the correct operation.

  The touch sensor device 20 detects how the finger (biological body) is placed on the finger vein authentication device 10 (details will be described later).

(appearance)
FIG. 2 is an explanatory diagram of the finger vein authentication device 10 according to the first embodiment. FIG. 2A is a plan view showing the appearance of the finger vein authentication device 10. FIG. 2B is a cross-sectional view of the finger vein authentication device 10.

The finger vein authentication device 10 includes an imaging device 12, an infrared light emitting device 13, a touch sensor device 20, an imaging window 61, and a mirror 62.
The imaging device 12 images a user's body (such as a finger). The finger vein authentication device 10 uses a camera with high spectral sensitivity in the infrared light region as the imaging device 12 in order to image a vein using a difference in infrared light absorption rate between blood vessels (blood) and other tissues. It is preferable to do this.
The infrared light emitting device 13 is, for example, an infrared LED, and irradiates light to the finger 70 for vein imaging.

The touch sensor device 20 detects position information indicating how a finger (biological body) is placed on the finger vein authentication device 10.
The type of sensor used as the touch sensor device 20 is not particularly limited. In the present embodiment, a capacitive touch sensor will be described as an example. This capacitive touch sensor detects the presence or absence of a finger by utilizing the fact that the capacitance changes when the finger touches.
When the finger 70 is placed on the finger vein authentication device 10, the finger 70 comes into contact with the touch sensor device 20, and the capacitance changes. Due to the change in capacitance, the touch sensor device 20 can accurately detect that the finger 70 is placed.

In the example illustrated in FIG. 2, the touch sensor device 20 is installed in two places. One place is placed behind the fingertip, and the other place is placed behind the fingertip.
Human fingers vary from person to person, but generally fingers are straight. If the fingertip position is detected by the fingertip touch sensor device 20 and the fingertip position is detected by the fingertip touch sensor device 20, the position where the finger is placed can be recognized.

In this embodiment, the touch sensor is used to detect the position where the finger is placed, but the present invention is not limited to this. Another sensor may be used, or the position where the finger is placed may be detected from the finger image, contour, joint, vein position, or the like.
Even in the non-contact type finger vein authentication device 10 that captures an image of a finger without bringing the finger into contact with the device, the position where the finger is placed can be detected from the finger image, contour, joint, vein position, and the like. .

The imaging window 61 protects the inside of the finger vein authentication device 10 and takes light scattered from the finger 70 into the finger vein authentication device 10. The imaging window 61 is preferably provided with a filter that prevents reflection of light scattered from the finger 70, transmits infrared light, and blocks transmission of visible light.
The mirror 62 reflects the light taken from the imaging window 61 to the imaging device 12.

(Function block diagram)
FIG. 3 is a functional block diagram of the finger vein authentication device 10 of the first embodiment.
The finger vein authentication unit 30 (authentication unit) has a software configuration based on a program, and functions thereof are an imaging setting control unit 31, a feature extraction unit 32, a template management unit 33, a template collation unit 34, and a position information detection unit 35. Have
Hereinafter, when the subject is described as “... Part”, the processor 11 loads the program into the memory 14 and realizes the function of the program.

The imaging setting control unit 31 adjusts the settings of the imaging device 12 and the infrared light emitting device 13 (details will be described later).
The feature extraction unit 32 extracts body features (such as vein patterns) from the image captured by the imaging device 12.
The template management unit 33 determines whether an image captured by the imaging device 12 is suitable for template creation. Further, the template management unit 33 associates the vein pattern from which the feature has been extracted and the setting information (detailed later) of the imaging device 12 and / or the infrared light emitting device 13 with a user ID as a matching template. Store in the memory 14 or an external device. Further, the template management unit 33 reads a verification template from the memory 14 or an external device.
The template matching unit 34 performs matching between the matching template and the authentication template, and determines whether or not the vein patterns match from the matching result.

  The verification template is a reference template and is used repeatedly. On the other hand, the authentication template is a template created every time authentication processing is performed. Incidentally, a template means a template or a reference, but in the present embodiment, authentication information created every time authentication is also referred to as an authentication template.

  The position information detection unit 35 detects position information from the detection result of the touch sensor device 20 and the image captured by the imaging device 12. Further, the position information detection unit 35 determines whether or not the position information at the time of registration matches the position information at the time of authentication. Then, the position information detection unit 35 calculates a difference (change amount) between the position information at the time of registration and the position information at the time of authentication.

  Note that the position information is not limited to that by a finger. It is also possible to detect position information of a living body other than a finger, register the position information as a verification template, and use it for authentication processing.

The upper part of Table 1 shows the format of the collation template in step S411 in the flowchart of FIG. 4 to be described later.
The middle part of Table 1 is a modification of the upper collation template, which is a collation template format including a plurality of position information and setting data. This is used when one user registers setting data at a plurality of positions.
The lower part of Table 1 shows the format of the authentication template in step S515 in the flowchart of FIG.

The verification template includes a user ID (identifier), a vein pattern from which features are extracted, position information, and setting data (setting information of the imaging device 12 and the infrared light emitting device 13).
The user ID is an identifier that uniquely identifies the user. The vein pattern from which the feature is extracted is information obtained by the feature extraction unit 32 extracting the feature of the living body from the image (biometric authentication information) captured by the imaging device 12 (details will be described later).
The position information is a result of the position information detection unit 35 detecting the position of the living body from the detection result of the touch sensor device 20 or the image captured by the imaging device 12.

  The setting data is information (setting information) related to the settings of the imaging device 12 and the infrared light emitting device 13. The setting information of the imaging device 12 is information such as exposure time, zoom magnification, and focus, for example. The setting information of the infrared light emitting device 13 is information such as luminance and wavelength, for example. The position information and the setting data may be collectively referred to as “setting data”.

  As shown in the middle of Table 1, when a plurality of combinations of position information and setting data are included for one combination of vein patterns from which user IDs and features are extracted, the position information at the time of authentication is most approximate. Setting data associated with the position information is used (details will be described later).

However, the information stored as the verification template is not limited to these.
The finger vein authentication device 10 encrypts and manages information as a countermeasure against information leakage. Information on the encryption algorithm may be stored as a verification template.
Alternatively, the number of times used for authentication may be stored as a matching template, and a matching template having a large number of times may be preferentially searched or used.

  The verification template is stored in advance in a storage device such as the memory 14. When the finger vein authentication device 10 is connected to an external device via the external I / F device 15, the verification template may be stored in the external device.

  The authentication template is created for each authentication process described later, and is temporarily stored in a storage device such as the memory 14. The authentication template includes a vein pattern from which features are extracted and position information. However, the information stored as the authentication template is not limited to these. In order to store the authentication template as a verification template to be used for subsequent authentications, the user ID, setting data (setting information of the imaging device 12 and the infrared light emitting device 13), the external light value and time described later are used. May be included.

(registration process)
A registration process for a matching template, which is a reference template, will be described with reference to FIGS.
FIG. 4 is a flowchart of a vein pattern registration procedure in the finger vein authentication device 10 of the first embodiment.

In step S401, the finger vein authentication device 10 is powered on by a user, administrator, timer, or the like.
Then, the process proceeds to step S402.
In step S <b> 402, the finger vein authentication unit 30 receives a user ID for requesting registration input by a user or an administrator via the input device 10-1. User IDs may be numbered in advance or may be automatically numbered during the registration process. Further, the input user ID may be output by the audio output device 16 or the video output device 17 to allow the user or administrator to reconfirm.
Then, the process proceeds to step S403.

In step S403, when the user who requests registration inserts the finger 70 into the finger vein authentication device 10, the infrared light emitting device 13 is turned on, and the finger 70 is irradiated with light. This light is scattered inside the finger 70. Light scattered from the finger 70 is input to the imaging device 12. Since veins and other tissues have different infrared light absorption rates, vein patterns can be imaged by scattered light.
Then, the process proceeds to step S404.

In step S404, the imaging device 12 captures an image of a finger and acquires an image.
Then, the process proceeds to step S405.

In step S405, the template management unit 33 determines whether or not a vein can be imaged in the image acquired in step S404. Note that the image of the vein being captured means whether the image is suitable for authentication.
In addition, the case where it is not suitable for authentication means the case where it is difficult to see the vein for the following reasons, for example.
(1) The image is dark because the amount of light is insufficient.
(2) The amount of light is too strong, and the image is skipped (overexposed).
(3) Out of focus (out of focus).
(4) Out of focus (out of focus).
(5) Camera sensitivity is not correct.

When the vein is not imaged (step S405 “No”), the imaging setting control unit 31 adjusts the settings of the imaging device 12 and / or the infrared light emitting device 13 in step S406. The settings of the imaging device 12 are, for example, exposure time, zoom magnification, focus, and the like. The settings of the infrared light emitting device 13 are, for example, luminance and wavelength.
Then, the process returns to step S404.

  If the vein has been imaged (step S405 “Yes”), in step S407, the template management unit 33 determines whether the acquired image is a finger.

When the acquired image is not a finger (step S407 “No”), in step S408, the audio output device 16 and the video output device 17 instruct the user to perform re-imaging. For example, the audio output device 16 generates an error sound or an error message, and the video output device 17 displays an error message or a guide message.
Then, the process returns to step S403.

When the acquired image is a finger (step S407 “Yes”), in step S409, the position information detection unit 35 detects position information from the image and the detection result of the touch sensor device 20. The detection result at this time is referred to as registration position information.
Then, the process proceeds to step S410.

In step S410, the feature extraction unit 32 extracts a vein pattern feature from the acquired image.
Then, the process proceeds to step S411.

In step S411, the template management unit 33 associates the vein pattern from which the feature has been extracted with the user ID, and stores them in the memory 14 or the external device as a matching template. At that time, the template management unit 33 combines the setting information (setting data) of the imaging device 12 and / or the infrared light emitting device 13 when the finger vein suitable for authentication is imaged and the registration position information. Remember. The setting information of the imaging device 12 and / or the infrared light emitting device 13 stored here is referred to as registration time setting information.
Then, the process proceeds to step S412.

In step S412, the audio output device 16 and the video output device 17 issue a registration completion message. For example, the audio output device 16 generates a completion sound or a completion message, and the video output device 17 displays a completion message to notify the user that the registration process has been completed.
Then, the finger vein authentication device 10 ends the process.

(Authentication process)
For example, an authentication process performed when determining whether to enter a room or determining whether a device can be used will be described with reference to FIGS.
FIG. 5 is a flowchart of a vein pattern authentication procedure in the finger vein authentication device 10 of the first embodiment.

In step S501, the finger vein authentication device 10 is powered on by a user, administrator, timer, or the like.
Then, the process proceeds to step S502.

  In step S502, the finger vein authentication unit 30 receives a user ID input by a user who requests authentication via the input device 10-1. When the input user ID is illegal, the finger vein authentication unit 30 may instruct the user to input again by the audio output device 16 and the video output device 17. For example, the audio output device 16 generates an error sound or an error message, and the video output device 17 displays an error message or a guide message.

In addition, that the user ID is invalid means that the user ID is incorrect, that the expiration date has expired, or that the vein pattern is not registered.
If the input user ID is valid, the process proceeds to step S503.

In step S <b> 503, the position information detection unit 35 detects the position information of the user's finger via the touch sensor device 20. The position information at this time is referred to as authentication position information.
Then, the process proceeds to step S504.

  In step S504, the template management unit 33 reads a matching template associated with the user ID received in step S502 from the memory 14 or an external device. Then, setting data and position information are read out from the matching template.

As shown in the middle part of Table 1, in the case of a matching template including a plurality of combinations of position information and setting data for one combination of vein patterns from which user IDs and features are extracted, Setting data associated with the closest positional information is used. That is, the collation template is searched using the input user ID as the first key and the authentication position information as the second key. Then, setting data that is closest to the position information and is included in the matching template with the matching user ID is specified. The settings of the imaging device 12 and / or the infrared light emitting device 13 are adjusted according to the specified setting data. Note that the closest approximation of the position information means that the difference (change amount) between the registration position information and the authentication position information is minimized.
Then, the process proceeds to step S505.

In step S505, the position information detection unit 35 compares the authentication position information detected in step S503 with the registration position information included in the matching template read in step S504, and finds the difference (change amount) between the two. calculate.
Then, the process proceeds to step S506.

  In step S506, the position information detection unit 35 determines whether or not the amount of change calculated in step S505 is equal to or less than a threshold value.

When the amount of change is not less than or equal to the threshold (step S506 “No”), in step S507, the imaging setting control unit 31 adjusts the settings of the imaging device 12 and / or the infrared light emitting device 13 according to the initial values.
Then, the process proceeds to step S509.

When the amount of change is equal to or smaller than the threshold value (step S506 “Yes”), in step S508, the imaging setting control unit 31 performs the imaging device 12 and / or the infrared light emitting device according to the setting data read in step S504. Adjust the 13 setting. In addition, when reading of setting data fails, it can also adjust according to an initial value.
Then, the process proceeds to step S509.

  Note that the setting information at the time of authentication and the position information at the time of authentication may be stored as a verification template, and the setting information and the position information may be used at the next authentication.

In step S509, the infrared light emitting device 13 is turned on, and the finger 70 is irradiated with light.
Then, the process proceeds to step S510.

In step S510, the imaging device 12 images a finger and acquires an image.
Then, the process proceeds to step S511.

  In step S511, the template management unit 33 determines whether or not the vein is captured in the image acquired in step S510. Note that the image of the vein being captured means whether the image is suitable for authentication.

If the vein has not been imaged (step S511 “No”), the imaging setting control unit 31 adjusts the settings of the imaging device 12 and / or the infrared light emitting device 13 in step S512. The settings of the imaging device 12 are, for example, exposure time, zoom magnification, focus, and the like. The settings of the infrared light emitting device 13 are, for example, luminance and wavelength.
Then, the process returns to step S510.
Incidentally, in the present embodiment, since the settings of the imaging device 12 and / or the infrared light emitting device 13 are adjusted by the processing in step S504 and step S508, the problem as described in the background art, that is, in step S511. It is possible to reliably reduce “No”.

If the vein has been imaged (step S511 “Yes”), in step S513, the template management unit 33 determines whether the captured image is a finger.
If the captured image is not a finger (step S513 “No”), the audio output device 16 and the video output device 17 instruct the user to re-image in step S514. For example, the audio output device 16 generates an error sound or an error message, and the video output device 17 displays an error message or a guide message.
Then, the process returns to step S509.

When the captured image is a finger (step S513 “Yes”), in step S515, the feature extraction unit 32 extracts the feature of the vein pattern. Then, the feature extraction unit 32 temporarily stores the vein pattern from which the feature has been extracted in the memory 14 as an authentication template.
Then, the process proceeds to step S516.

In step S516, the template collation unit 34 collates the collation template with the authentication template.
When the finger vein authentication device 10 is connected to an external device via the external I / F device 15, the authentication template may be stored and verified on the external device.
Then, the process proceeds to step S517.

  In step S517, the template matching unit 34 determines whether the vein patterns match from the matching result.

If the vein patterns do not match (step S517 “No”), the audio output device 16 and the video output device 17 issue an authentication failure message in step S518. For example, the audio output device 16 generates an error sound or an error message, and the video output device 17 displays an error message or a guide message to notify the user that the authentication has failed.
Then, the finger vein authentication device 10 ends the process.

If the vein patterns match (step S517 “Yes”), in step S519, the audio output device 16 and the video output device 17 issue an authentication completion message. For example, the audio output device 16 generates a completion sound or a completion message, and the video output device 17 displays a completion message to notify the user that the authentication is completed.
Then, the finger vein authentication device 10 ends the process.

(Effects of the embodiment, etc.)
In the first embodiment, the collation template is searched using the user ID and the position information as keys, and the settings of the imaging device 12 and / or the infrared light emitting device 13 are adjusted according to the specified setting data, so that the imaging settings are set. The number of feedback processes can be reduced. That is, the possibility of becoming “No” in step S511 can be reduced.

<< Second Embodiment >>
(Overview)
The finger vein authentication device 10 of the second embodiment further includes an external light sensor device 18 in addition to the finger vein authentication device 10 of the first embodiment. The finger vein authentication device 10 of the second embodiment further stores an external light value as a verification template. The outside light value and the setting data may be collectively referred to as “setting data”.
The setting information at the time of registration and authentication may change due to the influence of external light. Therefore, the finger vein authentication device 10 adjusts the settings of the imaging device 12 and / or the infrared light emitting device 13 based on the external light value.

  The finger vein authentication device 10 according to the second embodiment will be described. Note that description of elements common to the finger vein authentication device 10 of the first embodiment is omitted as appropriate.

(Constitution)
FIG. 3 described above is a functional block diagram of the finger vein authentication device 10 of the first embodiment. The finger vein authentication device 10 of the second embodiment will also be described with reference to FIG.
The template management unit 33 of the finger vein authentication device 10 of the second embodiment further has a function of storing an external light value as a verification template and further reading the external light value from the verification template.

FIG. 6 is a diagram illustrating a hardware configuration of the finger vein authentication device 10 according to the second embodiment.
FIG. 7 is an explanatory diagram of the finger vein authentication device 10 according to the second embodiment. FIG. 2A is a plan view showing the appearance of the finger vein authentication device 10. FIG. 2B is a cross-sectional view of the finger vein authentication device 10.
As shown in FIGS. 6 and 7, the finger vein authentication device 10 of the second embodiment further includes an external light sensor device 18 in addition to the configuration of the finger vein authentication device 10 of the first embodiment.

The external light sensor device 18 detects external light. The result of detecting the external light by the external light sensor device 18 is referred to as an external light value.
There is no particular limitation as to what type of sensor the outside light sensor device 18 is. Further, the installation position of the external light sensor device 18 is not particularly limited. In order to detect external light applied to the imaging device 12, the external light sensor device 18 is preferably installed near the imaging device 12.

(registration process)
The verification template registration process will be described with reference to FIG. 3 and FIGS.
FIG. 8 is a flowchart of a vein pattern registration procedure in the finger vein authentication device 10 of the second embodiment.
FIG. 8 differs from the flowchart (FIG. 4) of the vein pattern registration procedure in the finger vein authentication device 10 of the first embodiment in the following two points.
(1) A process for detecting external light (step S801) is added.
(2) When setting data is stored as a verification template (corresponding to step S411 in FIG. 4), the external light value at the time of registration is also stored (step S802).

Steps different from the vein pattern registration procedure in the finger vein authentication device 10 of the first embodiment will be described in detail.
In step S801, the external light sensor device 18 detects external light. The detection result at this time is called an external light value at the time of registration.
In step S802, the template management unit 33 associates the vein pattern from which the feature has been extracted with the user ID, and stores them in the memory 14 as a matching template.
At that time, the template management unit 33 sets the setting information of the imaging device 12 and / or the infrared light emitting device 13 when the finger vein pattern suitable for authentication is imaged, the registration position information, and the registration external light value. Are also stored together.

(Authentication process)
The authentication process will be described with reference to FIG. 3, FIG. 6, and FIG.
FIG. 9 is a flowchart of a vein pattern authentication procedure in the finger vein authentication device 10 of the second embodiment.
FIG. 9 differs from the flowchart (FIG. 5) of the vein pattern authentication procedure in the finger vein authentication apparatus 10 of the first embodiment in the following three points.
(1) A process for detecting external light (step S901) is added.
(2) When the setting data stored as the verification template is read (corresponding to step 504 in FIG. 5), the external light value at the time of registration is also read (step S902).
(3) A process of determining whether or not the external light value at the time of registration matches the external light value at the time of authentication (step S903) is added.

Steps different from the authentication procedure in the finger vein authentication device 10 of the first embodiment will be described in detail.
In step S901, when the input user ID is valid, the outside light sensor device 18 detects outside light. The detection result at this time is referred to as an authentication outside light value.
In step S902, the template management unit 33 reads the setting data, the position information, and the external light value at the time of registration from the matching template read in the same manner as the processing in step S504 (see FIG. 5).

In step S903, the imaging setting control unit 31 determines whether or not the registration-time external light value matches the authentication-time external light value.
If they match (step S903 “Yes”), in step S508, the imaging setting control unit 31 adjusts the settings of the imaging device 12 and / or the infrared light emitting device 13 according to the setting data read in step S902. In addition, when reading of setting data fails, a process can also be advanced by an initial value.
If they do not match (step S903 “No”), the process proceeds to step S507. Further, the setting information (setting data) at the time of registration is corrected based on the difference between the external light value at the time of registration and the external light value at the time of authentication, and the imaging device 12 and / or the infrared light emitting device is corrected according to the corrected setting information. Thirteen settings may be adjusted.

As in the first embodiment, the authentication setting information and the authentication external light value may be stored as a verification template, and the setting information and the external light value may be used for the next and subsequent authentications.
Further, when searching for a matching template, an external light value at the time of authentication may be used as a search key. Then, the setting data stored in the searched matching template may be used.

(Effects of the embodiment, etc.)
In the second embodiment, the external light value at the time of registration is compared with the external light value at the time of authentication, and if they match, the settings of the imaging device 12 and / or the infrared light emitting device 13 are adjusted according to the setting information at the time of registration. Thus, the number of imaging setting feedback processes can be reduced.
Also, the registration setting information is corrected based on the difference between the registration external light value and the authentication external light value, and the settings of the imaging device 12 and / or the infrared light emitting device 13 are set according to the corrected setting information. By adjusting, the number of imaging setting feedback processes can be reduced.

<< Third Embodiment >>
(Overview)
The finger vein authentication device 10 of the third embodiment further includes a clock device 19 in addition to the finger vein authentication device 10 of the first embodiment. The finger vein authentication device 10 of the third embodiment further stores the time when the vein pattern is registered as a verification template. The time and setting data may be collectively referred to as “setting data”.
The blood flow of the finger may change depending on the time. Due to the influence, setting information at the time of registration and authentication may be changed. Therefore, the finger vein authentication device 10 stores the registration time as a verification template, and at the time of authentication, the imaging device 12 and / or infrared light is used according to the template setting data registered at the time closest to the authentication time. The setting of the light emitting device 13 is adjusted.

  A finger vein authentication device 10 according to a third embodiment will be described. Note that description of elements common to the finger vein authentication device 10 of the first embodiment is omitted as appropriate.

(Constitution)
FIG. 3 described above is a functional block diagram of the finger vein authentication device 10 of the first embodiment. The finger vein authentication device 10 of the third embodiment will also be described with reference to FIG.
The template management unit 33 of the finger vein authentication device 10 of the third embodiment further has a function of storing a registration time as a verification template and further reading out the registration time from the verification template.

FIG. 10 is a diagram illustrating a hardware configuration of the finger vein authentication device 10 according to the third embodiment.
As shown in FIG. 10, the finger vein authentication device 10 of the third embodiment further includes a clock device 19 in addition to the configuration of the finger vein authentication device 10 of the first embodiment.

  The clock device 19 detects the time.

(registration process)
The verification template registration process will be described with reference to FIGS. 3, 10, and 11.
FIG. 11 is a flowchart of a vein pattern registration procedure in the finger vein authentication device 10 of the third embodiment.
FIG. 11 differs from the flowchart (FIG. 4) of the vein pattern registration procedure in the finger vein authentication device 10 of the first embodiment in the following two points.
(1) A process for detecting time (step S1101) is added.
(2) When setting data is stored as a verification template (corresponding to step S411 in FIG. 4), the registration time is also stored (step S1102).

Steps different from the vein pattern registration procedure in the finger vein authentication device 10 of the first embodiment will be described in detail.
In step S1101, the timepiece device 19 detects the time. The detection result at this time is called registration time. The clock device 19 may also detect the date and the day of the week.
In step S1102, the template management unit 33 associates the vein pattern from which the feature has been extracted with the user ID, and stores them in the memory 14 or the external device as a matching template.
At that time, the template management unit 33 stores the setting information of the imaging device 12 and / or the infrared light emitting device 13 when the finger vein pattern suitable for authentication is imaged and the registration time. The date and day of the week may be stored in the verification template.
Registration processing is performed a plurality of times at different times, and a plurality of matching templates are stored.

(Authentication process)
The authentication process will be described with reference to FIG. 3, FIG. 10, and FIG.
FIG. 12 is a flowchart of a vein pattern authentication procedure in the finger vein authentication device 10 of the third embodiment.
FIG. 12 differs from the flowchart (FIG. 5) of the vein pattern authentication procedure in the finger vein authentication device 10 of the first embodiment in the following two points.
(1) A process for detecting time (step S1201) is added.
(2) When searching for a matching template, a process (step S1202) of reading a matching template in which the nearest registration time is stored using the authentication time as a search key is added.

Steps different from the authentication procedure in the finger vein authentication device 10 of the first embodiment will be described in detail.
In step S1201, when the input user ID is valid, the clock device 19 detects the time. The detection result at this time is called an authentication time. The clock device 19 may also detect the date and the day of the week.

  In step S1202, the template management unit 33 searches for a matching template in the same manner as in the process of step S504 (see FIG. 5). At this time, the authentication time is further used as a search key. Then, the setting data and the position information stored in the retrieved matching template are read out.

  As in the first embodiment, the authentication setting information and the authentication time may be stored as a verification template, and the setting information and the time may be used for the next and subsequent authentications.

(Effects of the embodiment, etc.)
In the third embodiment, the registration time and the authentication time are compared, and authentication is performed using the matching template that is closest to each other, so that the number of imaging setting feedback processes can be reduced.

<< Summary >>
Although each embodiment has been described for each piece of information stored as a matching template, the information stored as a template is not limited to one. A plurality of pieces of information may be stored in the template. Further, the combination is not limited. For example, the external light value and the time may be stored as a template.

Further, by storing information related to the encryption algorithm in the verification template, the decryption process can be performed quickly. By storing information on the feature quantity extraction algorithm, it is possible to eliminate a situation where an authentication template is created with a different algorithm.
Alternatively, the number of times used for authentication may be stored as a matching template, and a matching template having a large number of times may be preferentially searched or used. When the area for storing the verification template is insufficient, the verification template that has been used a small number of times for authentication can be deleted to effectively use the resources.

  In addition, when a plurality of setting information is stored, an average value of these may be calculated, and the settings of the imaging device 12 and / or the infrared light emitting device 13 may be adjusted according to the average value.

  In this way, by storing a plurality of information as collation templates, specifying a collation template to be preferentially searched or used, or reducing the number of collation templates stored in the storage device, Further, the number of imaging setting feedback processes can be reduced, and highly accurate authentication can be performed.

  As described above, the finger vein authentication device using the finger vein has been described as an example of the biometric authentication device, but the present invention is not construed as being limited to the above-described embodiment. For example, the present invention can naturally be applied to a biometric authentication device using a palm vein. Further, the present invention is not limited to veins and can be applied to personal authentication by biometric authentication using physical characteristics such as fingerprints and irises and behavioral characteristics such as blinking.

10 Finger vein authentication device (Biometric authentication device)
10-1 Input device 11 Processor 12 Imaging device (imaging unit, biometric authentication information acquisition unit)
13 Infrared light emitting device (light emitting unit, biometric authentication information acquiring unit)
14 Memory (storage device)
15 External I / F device 16 Audio output device 17 Video output device 18 External light sensor device (external light detection unit, biometric authentication information acquisition unit)
19 Clock device (time detector)
20 Touch sensor device (biometric authentication information acquisition unit)
30 Finger vein authentication unit (authentication unit)
31 imaging setting control unit 32 feature extraction unit 33 template management unit 34 template collation unit 35 position information detection unit 61 imaging window 62 mirror 70 finger

Claims (7)

A biometric authentication information acquisition unit for acquiring biometric authentication information for biometric authentication from the body of a subject to be authenticated, and detecting the position of the body;
A storage unit that stores information for collation with the acquired biometric authentication information in association with personal identification information for individually identifying the target person,
An input unit for inputting the personal identification information;
Biometric authentication including verification information corresponding to personal identification information input via the input unit and an authentication unit that performs personal authentication by comparing the biometric information acquired by the biometric information acquisition unit A device,
At least one of the usage conditions of the device used when creating the verification information and the information on the subject's body is stored as setting data in association with the personal identification information or the verification information. A setting data storage unit,
The setting data is read based on the personal identification information input at the time of authentication or the verification information specified by the personal identification information, and at least a part of the read setting information is set in the biometric authentication information acquisition unit And a setting unit for acquiring the biometric authentication information,
The authentication unit has a position information detection unit that acquires biometric position information from biometric authentication information acquired from the biometric information acquisition unit,
The setting data storage unit has, as one of the setting data, position information of the living body when the information for verification is acquired,
The authentication unit compares the position information of the living body when the information for verification is acquired with the position information of the living body at the time of authentication, calculates a change amount of the position of the living body, When the amount of change in position is equal to or less than a predetermined threshold, personal authentication is performed using biometric authentication information acquired in a state where setting data other than the biometric position information is set in the biometric authentication information acquisition unit A biometric authentication device characterized by the above. The setting data storage unit has, as the setting data, position information of a plurality of living organisms for the same subject and setting data other than the position information of the living organism corresponding to each of the position information of the plurality of living organisms. And
The setting unit sets the biometric authentication information acquisition unit to set the setting data corresponding to the biometric position information so that the change amount of the biometric position information is minimized, and acquires the biometric authentication information.
The authentication unit uses the biometric authentication information acquired in a state in which setting data corresponding to the biometric location information that minimizes the amount of change in the biometric location information is set in the biometric authentication information acquisition unit. The biometric authentication device according to claim 1, wherein authentication is performed. The biometric information acquisition unit includes a touch sensor unit,
The biometric authentication device according to claim 1, wherein the position information detection unit acquires position information of the living body from a detection result of the touch sensor unit. The biometric authentication information acquisition unit includes an imaging unit,
The biometric authentication device according to any one of claims 1 to 3, wherein the setting data includes data for setting an imaging condition of the imaging unit. The biometric authentication information acquisition unit includes a light emitting unit,
The biometric authentication device according to any one of claims 1 to 4, wherein the setting data includes data for setting a light emission condition of the light emitting unit. The biometric authentication information acquisition unit includes an outside light detection unit,
The biometric authentication device according to any one of claims 1 to 5, wherein the setting data is data including an external light value detected by the external light detection unit. The biometric authentication information acquisition unit includes a time detection unit,
The biometric authentication device according to any one of claims 1 to 6, wherein the setting data is data including a time detected by the time detection unit.

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