JP2010146158A - Biometric authentication device, biometric authentication method, and computer program - Google Patents

Abstract

An object of the present invention is to guide the position of a hand without delaying the authentication work, regardless of whether the hand to be presented is left or right.
A biosensor is provided in a housing of the biometric authentication device and acquires biometric information. The positional relationship between the person to be authenticated and the housing of the biometric authentication device 1 is acquired by the distance sensor 13 and the position detection unit 23. The CPU 30 determines, based on the positional relationship acquired by the distance sensor 13 and the position detection unit 23, whether the hand to be authenticated by the person to be authenticated is the left or right hand in the biometric information acquisition region of the biometric sensor 14. The display control unit 22 displays an image of the palm at the time of registration of the person to be authenticated on the display unit 12, and guides the position of the hand of the person to be authenticated with respect to the biosensor 14 for the hand corresponding to the determination result by the CPU 30. .
[Selection] Figure 2

Description

  The present invention relates to authentication technology, and more particularly, to biometric authentication technology.

  For example, when performing personal authentication based on biological information such as the shape of a palm (palm shape), the shape of a palm or finger vein, or the shape of a fingerprint, the position of the living body relative to a sensor that acquires the biological information is registered and authenticated. It is desirable to match in order for more accurate authentication.

As a technique for matching the position of a living body with respect to a sensor at the time of registration and at the time of authentication, for example, a technique for guiding a position of a living body by displaying a biometric image acquired at the time of registration as a guide image at the time of authentication is known. It has been.
JP 2008-71158 A

  When biometric information is acquired from a hand and authentication is performed, it is preferable that the guide image for guiding the biometric position is displayed by the person to be authenticated to be presented for authentication among the left and right hands. However, since it is not always determined whether the person to be authenticated presents with the left or right hand at the time of authentication, it is necessary to determine before the guide image is displayed whether the hand to be authenticated is the hand left or right. is there.

  Here, it is possible to determine the right and left of the hand based on the information acquired by the sensor for acquiring biological information. However, in this method, since the guide image cannot be displayed until the sensor acquires necessary information, the guidance of the living body position is delayed, and as a result, it takes extra time for the authentication work and is troublesome for the person to be authenticated. It may make you feel.

  The present invention has been made in view of the above-described problems, and the problem to be solved is to delay the authentication work by guiding the position of the hand, regardless of whether the hand to be authenticated is left or right. It is to be able to do without.

  One of the biometric authentication devices disclosed in this specification is for authenticating a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated. The biometric authentication device includes a biometric information sensor, a positional relationship acquisition unit, a determination unit, and a display control unit. Here, the biometric information sensor is provided in the housing of the biometric authentication device and acquires biometric information. The positional relationship acquisition means acquires the positional relationship between the person to be authenticated and the housing of the biometric authentication device. The determination means determines whether the hand that the person to be authenticated presents to the biometric information acquisition area in the biometric information sensor is the left or right hand based on the positional relationship acquired by the positional relationship acquisition means. The display control unit displays an image corresponding to the determination result by the determination unit on the display unit.

  According to this biometric authentication apparatus, the determination unit determines whether the hand to be authenticated is the left or right hand based on the positional relationship acquired by the positional relationship acquisition unit. Therefore, even if the hand of the person to be authenticated is before the biometric information is acquired by the biometric information sensor, the left / right determination of the hand to be presented by the person to be authenticated can be performed. Here, the display control means displays an image corresponding to the right and left of the hand on the display unit to guide the position of the hand and appropriately guide the living body position, so that the authentication work is not delayed.

  As described above, according to the biometric authentication device disclosed in the present specification, it is possible to guide the position of the hand without delaying the authentication work regardless of whether the hand to be authenticated is left or right. Play.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1A will be described. FIG. 1A shows a first example of the external configuration of the biometric authentication device 1. The biometric authentication device 1 authenticates a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated.

  The biometric authentication device 1 illustrated in FIG. 1A includes a numeric keypad 11, a display unit 12, a distance sensor 13, a biometric sensor 14, and a light shielding cover 15, which are arranged on the same surface of the housing 16. Has been.

The numeric keypad 11 is a switch operated by the person to be authenticated, and receives input of numerical information associated with the operation from the person to be authenticated.
The display unit 12 is a liquid crystal display, for example, and displays a palm image and various types of information. The palm image displayed on the display unit 12 guides the position of the authentication subject's hand with respect to the biosensor 14 so that the biosensor 14 can acquire biometric information.

A plurality of distance sensors 13 are provided from the left part to the right part of the lower end of the casing 16 of the biometric authentication device 1, and each measures the distance to the person to be authenticated.
The biosensor (biometric information sensor) 14 is provided in the housing 16 of the biometric authentication device 1 and acquires biometric information from the hand of the person to be authenticated. In the present embodiment, the biometric sensor 14 acquires the shape information of the palm vein of the person to be authenticated as biometric information. The shape information of the vein can be acquired by, for example, imaging reflected light when the entire palm is irradiated with infrared light having a wavelength absorbed by hemoglobin of red blood cells flowing through the vein.

  Other biometric information that can be used for authentication of the person to be authenticated includes, for example, palm shape (palm shape) and wrinkle (palm print) information, finger vein shape information, and fingerprint shape information. . When authentication of the person to be authenticated is performed based on the biometric information, the biometric sensor 14 acquires the information from the hand of the person to be authenticated.

The biosensor 14 also captures an image of the palm of the person to be authenticated (visible light image).
The light shielding cover 15 shields the biological sensor 14 from external light, and is provided with an opening 17 into which the person to be authenticated inserts his / her hand when he / she puts his / her hand into the biometric information acquisition area of the biological sensor 14. Yes. The display unit 12 is provided on the outer surface of the light shielding cover 15 that covers the biosensor 14.

  Note that the arrangement relationship between the numeric keypad 11, the display unit 12, the biosensor 14, and the light shielding cover 15 on the surface of the housing 16 is shown in FIG. 1B instead of being arranged vertically as shown in FIG. 1A. You may make it arrange side by side like the 2nd example of the external appearance structure shown.

Next, FIG. 2 will be described. FIG. 2 shows the internal configuration of the biometric authentication device 1.
The biometric authentication device 1 includes an ID extraction unit 21, a display control unit 22, a position detection unit 23, and an authentication control unit 24 in addition to the numeric keypad 11, the display unit 12, the distance sensor 13, and the biometric sensor 14 illustrated in FIG. , A CPU 30 and a database 40.

The ID extraction unit 21 extracts ID information (identification information) individually assigned to the person to be authenticated, input by the person to be authenticated, from the input of numeric information received by the numeric keypad 11.
The display control unit 22 performs control for causing the display unit 12 to display a palm image expressed by image data output from the CPU 30.

  The position detection unit 23 acquires the positional relationship between the person to be authenticated and the housing 16 of the biometric authentication device 1, and in this embodiment, the standing position of the person to be authenticated standing facing the housing 16. The positional relationship with the housing 16 is acquired. The position detection unit 23 acquires this positional relationship based on the distance to the person to be authenticated measured by the distance sensor 13. More specifically, the position detection unit 23 calculates the distance between the standing position of the person to be authenticated and each of the right part and the left part of the housing 16 based on the distance to the person to be authenticated measured by each of the distance sensors 13. The measurement result is calculated and the measurement result is output as the above-described positional relationship acquisition result.

  The authentication control unit 24 compares the biometric information acquired from the biometric sensor 14 with the biometric information stored in advance in the database 40 and authenticates the person to be authenticated. .

  The CPU (central processing unit) 30 manages the operation of each component of the biometric authentication device 1. In particular, the CPU 30 provides a function of determining, based on the positional relationship acquired by the position detection unit 23, whether the hand to be authenticated by the person to be authenticated is the left or right hand in the biometric information acquisition area of the biometric sensor 14. In this embodiment, this determination is performed based on the measurement result of the distance between the standing position of the person to be authenticated and each of the right part and the left part of the housing 16 acquired by the position detection unit 23.

  The CPU 30 includes an MPU (micro processor), a RAM, and a ROM. Here, the MPU performs various control operations by executing a control program. The RAM is a random access memory that provides a temporary storage area for work that is used as necessary when the MPU executes a control program. The ROM is a read-only memory in which a control program executed by the MPU is stored in advance. When the MPU reads a control program (computer program) stored in the ROM and starts executing the CPU 30, the CPU 30 performs various control processes described later to provide the above-described functions.

  The database 40 is a data group stored in a storage device (not shown). In the database 40, image data representing the left and right palm images of each person to be authenticated and biometric information data of each person to be authenticated (in this embodiment, left and right palm vein shape information data). The ID information individually assigned to the person to be authenticated is registered in association with the ID information.

The biometric authentication device 1 includes the above components.
Next, FIG. 3 will be described. FIG. 3 represents the data structure of the database 40.
The database 40 has an index area, an image data area, and a vein data area as data registration areas.

  In the image data area, image data for the right hand and the left hand of each person to be authenticated is registered. In the vein data area, vein shape information data (hereinafter referred to as “vein data”) for the right hand and the left hand of each person to be authenticated is registered.

  The index area includes index (index) information indicating the position on the image data area and the position on the vein data area where the image data and vein data for the right hand and the left hand of each person to be authenticated are registered. Registered in association with ID information. For example, the image data and vein data for the authenticated person specified by the ID information “1” is obtained by using the index information associated with “ID # 1” in the index area in the example of FIG. The image data area and the vein data area can be read out.

  Next, FIG. 4 will be described. FIG. 4 is a flowchart showing the contents of the registration process performed by the biometric authentication device 1. This registration process is a process of registering image data and vein data for the person to be authenticated in the database 40 and is performed by the CPU 30.

  In FIG. 4, first, in S <b> 101, the CPU 30 performs a process of acquiring, from the ID extraction unit 21, ID information that is input by operating the numeric keypad 11 by the person to be authenticated (the person to be registered in the registration process of FIG. 4). .

  Next, in S102, the CPU 30 gives a predetermined instruction to the display control unit 22 to display information representing that the right-hand biometric information is registered on the display unit 12, and informs the registrant about that. Process to notify.

  Next, in S <b> 103, the CPU 30 determines whether or not the right hand of the registered person is detected in the biometric information acquisition area in the biometric sensor 14, as a signal representing the captured image output from the biometric sensor 14. Based on the determination process. Here, when the CPU 30 determines that the right hand of the registered person has been detected (when the determination result is Yes), the process proceeds to S104. On the other hand, when it is determined that the right hand of the registered person has not been detected yet (when the determination result is No), the process of S103 is repeated until it is detected.

Next, in S <b> 104, the CPU 30 receives the output signal from the biometric sensor 14 and performs a process of acquiring an image of the palm of the right hand of the registered person represented by this output signal.
Next, in S <b> 105, the CPU 30 receives the output signal from the biometric sensor 14 and performs processing for acquiring the shape information of the palm vein of the right hand of the registered person represented by this output signal.

  Next, in S106, the CPU 30 registers in the database 40 the right-hand image data representing the image acquired in the process of S104 and the right-hand vein data representing the shape information acquired in the process of S105. I do. In this process, the CPU 30 registers the right-hand image data in the empty area in the image data area of the database 40 and registers the right-hand vein data in the empty area in the vein data area of the database 40. Then, the index information indicating the registration position of each of the right hand image data and the right hand vein data is registered in the index area of the database 40 in association with the ID information of the registered person acquired in the process of S101.

  Next, in S107, the CPU 30 gives a predetermined instruction to the display control unit 22 to display information representing that the biometric information of the left hand is registered on the display unit 12, and informs the registrant about that. Process to notify.

  Next, in S <b> 108, the CPU 30 indicates whether or not the left hand of the registered person is detected in the biometric information acquisition area in the biometric sensor 14, as a signal representing a captured image output from the biometric sensor 14. Based on the determination process. Here, when it is determined that the left hand of the registered person has been detected (when the determination result is Yes), the CPU 30 advances the process to S109. On the other hand, when it is determined that the left hand of the registered person has not been detected yet (when the determination result is No), the process of S108 is repeated until it is detected.

Next, in S109, the CPU 30 performs a process of receiving an output signal from the biosensor 14 and acquiring an image of the palm of the left hand of the registered person represented by this output signal.
Next, in S110, the CPU 30 performs a process of receiving an output signal from the biometric sensor 14 and acquiring shape information of the palm vein of the left hand of the registered person represented by this output signal.

  Next, in S111, the CPU 30 registers in the database 40 the left-hand image data expressing the image acquired in the process of S109 and the left-hand vein data expressing the shape information acquired in the process of S110. Thereafter, the registration process is terminated. In this process, the CPU 30 registers left-hand image data in a free area in the image data area of the database 40 and registers left-hand vein data in a free area in the vein data area of the database 40. Then, the index information indicating the registration position of each of the left hand image data and the left hand vein data is registered in the index area of the database 40 in association with the ID information of the registered person acquired in the process of S101.

The above processing is registration processing.
In the embodiment described above, the biometric authentication device 1 performs the registration process. Instead of this, for example, this registration process is performed by a registration device dedicated to registration of biometric information, and the acquired ID information for each registered person, left and right palm image data, and vein data are transmitted from the registration device to the communication line. The biometric authentication device 1 may receive it via In this case, the biometric authentication device 1 performs processing for registering the received various data in the database 40 according to the data structure shown in FIG.

  Next, an authentication process performed by the biometric authentication device 1 will be described. This authentication process is a process for authenticating a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated (in this embodiment, palm vein shape information).

First, FIG. 5 will be described. FIG. 5 shows an outline of the authentication process.
The biometric authentication device 1 first performs an ID input acquisition process in S200. This process determines whether the registration information (image data and vein data) of the person to be authenticated exists in the database 40 based on the ID information input by the person to be authenticated. This is a process of reading registration information from the database 40.

  Next, the biometric authentication device 1 performs the left / right position detection process of S300. In this process, the standing position of the person to be authenticated standing facing the casing 16 of the biometric authentication device 1 is detected, and the standing position is determined on the right side or the left side of the casing 16. It is. Here, when it is determined that the standing position is on the right side of the housing 16 based on the positional relationship between the standing position and the housing 16, the hand to be given by the person to be authenticated is unnatural. It is determined that the left hand can be inserted into the opening 17 of the light shielding cover 15 without taking the posture. Further, when it is determined that the standing position is close to the left side of the housing 16, the hand that the person to be authenticated presents is determined to be the right hand based on the same idea.

  Next, the biometric authentication device 1 performs the hand image display process of S400a. In this process, an image (an image at the time of registering the palm of the person to be authenticated) represented by the image data of the hand corresponding to the determination result of the hand to be presented by the person to be authenticated is registered. This is processing to be displayed on the display unit 12. By displaying this image, the position of the hand of the person to be authenticated with respect to the biometric sensor 14 is guided.

  Note that the image at the time of registration of the palm of the person to be authenticated is displayed on the display unit 12 by being reversed left and right. That is, for example, when the image at the time of registration of the palm of the right hand of the person to be authenticated illustrated in FIG. 6A is displayed on the display unit 12, as shown in FIG. 6B, the image of FIG. The image is displayed with the thumb side on the left side.

  In the external configuration of FIGS. 1A and 1B, the biometric sensor 14 acquires biometric information from the palm of the person to be authenticated, whereas the display unit 12 provided on the outer surface of the light shielding cover 15 At the time of acquisition, it will be located on the back side of the hand. Therefore, by reversing the palm image horizontally and displaying it on the display unit 12, the person to be authenticated can see through the palm image at the time of his / her registration displayed on the display unit 12 from the back side of the hand. Since the image can be seen with such a feeling, the hand position is more appropriately guided.

  Further, in this hand image display process, the subject to be authenticated, which is superposed on the palm image at the time of registration of the person to be authenticated displayed on the display unit 12, and is captured and acquired by the biosensor 14 at this time. A process for displaying a live image of the palm of the person on the display unit 12 is performed. The live image of the palm is also displayed on the display unit 12 by being reversed horizontally like the image at the time of registration.

  An example of superimposed display on the display unit 12 of the palm image of the right hand is shown in FIG. 7A. The person to be authenticated refers to the superimposed image and moves the hand so that the live palm image (live image 51) exactly overlaps the palm registration image (registration image 52). Thus, the hand is guided to an appropriate position. Here, since the live image 51 is reversed left and right and displayed on the display unit 12, there is no unnaturalness in which the moving direction of the person to be authenticated and the moving direction of the live image 51 are reversed on the left and right. Further, since the palm image in the light shielding cover 15 that cannot be directly viewed by the person to be authenticated is displayed on the display unit 12, anxiety and discomfort felt by the person to be authenticated can be reduced.

  In addition, in the superimposed display of the palm image, as illustrated in FIG. 7B, an image of only the palm outline at the time of registration may be displayed as the registration-time image 52. By doing so, the visibility of the live image 51 at the time of superimposed display is improved, so that the user can easily move the hand for superimposing the live image 51 on the registration-time image 52.

  Returning to the description of FIG. Next, the biometric authentication device 1 performs the verification process of S400b. In this process, the current biometric information of the person to be authenticated (palm vein data in the present embodiment) is collated with that at the time of registration, and the person to be authenticated is authenticated based on the collation result.

Next, specific processing contents of the authentication processing of FIG. 5 will be described.
First, FIG. 8 will be described. FIG. 8 is a flowchart showing the specific processing contents of the ID input acquisition processing which is the processing of S200 of FIG. This ID input acquisition process is performed by the ID extraction unit 21 and the CPU 30.

First, in S <b> 201, the ID extraction unit 21 performs processing for acquiring the operation content of the ten-key switch 11 by the person to be authenticated.
In S202, the ID extraction unit 21 performs a process of determining whether or not the number of digits of the numeric input indicated by the acquired operation content of the numeric keypad 11 is appropriate as the number of digits of the ID information. Note that the number of digits of the ID information is defined in advance. Here, when the ID extraction unit 21 determines that the number of digits for the number input is appropriate, the ID extraction unit 21 passes the input number information to the CPU 30 and advances the process to S203. On the other hand, if the ID extraction unit 21 determines that the number of digits for the numeric input is inappropriate, the process returns to S201, and the operation content acquisition processing of the numeric keypad 11 is performed again.

Next, in S203, CPU30 searches the index area | region of the database 40, and performs the process which finds out ID information corresponding to the acquired number information.
Next, in S <b> 204, the CPU 30 performs a process of determining whether or not the index area of the database 40 can be found from the ID information corresponding to the acquired numeric information. Here, when the CPU 30 determines that the ID information has been found (when the determination result is “Yes”), the process proceeds to S205. On the other hand, when the CPU 30 determines that the ID information cannot be found (when the determination result is “no”), the CPU 30 considers that the operation of the ten-key switch 11 by the person to be authenticated has an error, and returns the process to S201. The acquisition process of the operation content of the numeric keypad 11 is performed again.

Next, in S205, the CPU 30 searches the image data area and the vein data area using the index information associated with the found ID information in the index area, and the image data at the time of registration of the person to be authenticated and Process to find vein data. Thereafter, the ID input acquisition process is terminated.
The above process is the ID input acquisition process.

  Next, FIG. 9 will be described. FIG. 9 is a flowchart showing specific processing contents of the left / right position detection processing which is processing of S300 in FIG. The left / right position detection process is performed by the position detection unit 23 and the CPU 30.

  First, in S301, the position detection unit 23 controls each distance sensor 13 to measure the distance from each distance sensor 13 to the person to be authenticated facing the casing 16 of the biometric authentication device 1, and the measurement result. Is transferred to the CPU 30.

  Next, in S <b> 302, the CPU 30 calculates an average value of distances measured by the distance sensors 13 provided on the left side of the casing 16 among the plurality of distance sensors 13 provided on the casing 16 of the biometric authentication device 1. A process of calculating the measurement result n of the distance between the authenticator and the left part of the housing 16 is performed.

  Next, in S303, the CPU 30 calculates the average value of the distances measured by the distance sensors 13 provided in the right part of the casing 16 among the distance sensors 13 provided in the casing 16 of the biometric authentication device 1. A process of calculating the measurement result m of the distance between the authenticator and the right part of the housing 16 is performed.

  Next, in S304, the CPU 30 determines the measurement result n of the distance between the person to be authenticated and the left part of the case 16 calculated in the process of S302, and the person to be authenticated and the case 16 calculated in the process of S303. A process of comparing the magnitude of the value with the measurement result m of the distance to the right part is performed.

  In the determination process of S304, when it is determined that the measurement result m is smaller than the measurement result n (that is, the right part of the housing 16 is closer to the person to be authenticated than the left part), the CPU 30 advances the process to S305. A process for determining that the hand to be presented by the person to be authenticated is a left hand is performed. At this time, since the standing position of the person to be authenticated is close to the right side of the housing 16, as described above, the person to be authenticated does not take an unnatural posture and enters the opening 17 of the light shielding cover 15. This is because it is considered that the left hand can be inserted.

  On the other hand, in the determination process of S304, when it is determined that the measurement result n is smaller than the measurement result m (that is, the left part of the casing 16 is closer to the person to be authenticated than the right part), the CPU 30 performs the process in S306. Proceeding, a process for determining that the hand to be presented by the person to be authenticated is the right hand is performed. At this time, since the standing position of the person to be authenticated is close to the left side of the casing 16, as described above, the person to be authenticated does not take an unnatural posture and enters the opening 17 of the light shielding cover 15. This is because it is considered that the right hand can be inserted.

In the determination process of S304, if the measurement result n and the measurement result m match, the process proceeds to S306, and for the sake of convenience, the process of determining that the hand to be authenticated is the right hand is made. Like to do. However, when the measurement result n and the measurement result m match, the process may proceed to S305, and the process of determining that the hand to be presented by the person to be authenticated becomes the left hand may be performed for convenience.
After this determination process, the left / right position detection process ends.
The above processing is the left / right position detection processing.

  Next, FIG. 10 will be described. FIG. 10 is a flowchart showing specific processing contents of the hand image display process that is the process of S400a in FIG. 5 and the collation process that is the process of S400b in FIG. The hand image display process and the collation process are performed by the authentication control unit 24 and the CPU 30.

  First, in S401, the CPU 30 performs a process of determining whether the determination result of the hand to be presented by the person to be authenticated is a right hand or a left hand, which is determined by the determination process of S304 in the left / right position detection process of FIG. If the determination result is the right hand, the process proceeds to S402. If the determination result is the left hand, the process proceeds to S403.

  Next, in S402, the CPU 30 executes the ID input acquisition process of FIG. 8 and finds out the image data and veins associated with the ID information input by the user to be authenticated and the vein data registered. A process of reading out data from the right hand side from the database 40 is performed. Of the data read by this processing, vein data is transferred to the authentication control unit 24. Thereafter, the process proceeds to S404.

  Next, in S403, the CPU 30 executes the ID input acquisition process of FIG. 8 and finds out the image data and veins associated with the ID information input by the user to be authenticated and the vein data that has been found. A process of reading data from the left side from the database 40 is performed. Of the data read by this processing, vein data is transferred to the authentication control unit 24. Thereafter, the process proceeds to S404.

  Next, in S404, the CPU 30 controls the display control unit 22 to perform a process of causing the display unit 12 to display the hand image expressed by the image data read out in the process of S402 or S403. That is, in the process of S404, a process for causing the display unit 12 to display the hand image corresponding to the determination result by the determination process of S304 (FIG. 9) described above among the palm images at the time of registration of the authentication subject is performed. . By this processing, the position of the authentication subject's hand with respect to the biometric sensor 14 is guided.

In the process of S404, as described above, the image at the time of registering the palm of the person to be authenticated is reversed left and right and displayed on the display unit 12.
Next, in S <b> 405, the CPU 30 performs a process of assigning an initial value “0” to the variable r. This variable r is used for counting the number of collations (the number of times collation processing to be described later is executed).

  Next, in S <b> 406, the CPU 30 indicates whether or not a registered person's hand has been detected in the biometric information acquisition area in the biometric sensor 14, as a signal representing a captured image output from the biometric sensor 14. Based on the determination process. Here, when it is determined that the registered person's hand has been detected (when the determination result is Yes), the CPU 30 advances the process to S407. On the other hand, when it is determined that the registered person's hand has not been detected yet (when the determination result is No), the process of S406 is repeated until it is detected.

  Next, in S407, the authentication control unit 24 receives an output signal from the biological sensor 14, acquires an image of a registered person's palm (live image) expressed by the output signal, and this information. The image data expressing the above is transferred to the CPU 30.

In step S <b> 408, the authentication control unit 24 receives the output signal from the biometric sensor 14 and performs processing for obtaining the shape information of the palm vein of the registered person represented by the output signal.
Next, in S409, the CPU 30 controls the display control unit 22 to display the live image of the palm expressed by the image data received in the process of S407 in the process of S404. A process of superimposing on the palm image at the time of registration and displaying on the display unit 12 is performed. Note that in the process of S409 as well as the process of S404, the live image of the palm acquired in the process of S407 is horizontally reversed and displayed on the display unit 12.

  Next, in S410, the authentication control unit 24 acquires the palm vein shape information at the time of registration of the person to be authenticated, which is expressed by the vein data transferred by the processing of S403 or S404, and the processing of S408. Image processing for comparing features with shape information is performed. In subsequent S411, the authentication control unit 24 performs a process of determining whether or not two pieces of shape information can be regarded as those of the same person's palm vein because the difference in characteristics is less than a predetermined amount. Here, when the authentication control unit 24 determines that the two pieces of shape information can be regarded as those of the same person's palm vein (when the determination result is OK), the CPU 30 is notified of this and the processing in S412 is performed. To proceed. On the other hand, when the authentication control unit 24 determines that the two pieces of shape information cannot be regarded as those of the same person's palm vein (when the determination result is NG), the authentication control unit 24 notifies the CPU 30 to that effect. The process proceeds to S413.

  In S412, the CPU 30 performs a process of outputting information indicating that it is “OK” (authenticated as the principal) as an authentication result for the person to be authenticated, and thereafter the process of FIG. Exit.

In S413, the CPU 30 performs a process of increasing the value of the variable r by “1” by substituting the value obtained by adding “1” to the current value of the variable r described above into the variable r.
In S414, the CPU 30 performs a process of determining whether or not the current value of the variable r exceeds the retry count R of the authentication process, which is a preset value. Here, when the CPU 30 determines that the current value of the variable r is equal to or less than the retry count R and does not exceed the retry count R, the CPU 30 returns the process to S407 and executes the matching process from S407 to S411 again. To do. On the other hand, if the CPU 30 determines that the current value of the variable r has exceeded the number of retries R, the process proceeds to S415.

  In S415, the CPU 30 performs a process of outputting information indicating that the authentication result for the person to be authenticated is “NG” (identification of the person could not be authenticated), and thereafter, the process shown in FIG. The process ends.

  10 is performed, the biometric authentication device 1 authenticates the person to be authenticated based on the biometric information (in this embodiment, palm vein shape information) acquired from the hand of the person to be authenticated. Done.

  As described above, in the biometric authentication device 1, when performing biometric authentication, the palm position guidance is displayed on the display unit 12 arranged at an easily viewable position on the light shielding cover 15, and the biometric authentication apparatus 1 is set to an appropriate position. Since the person to be authenticated is guided, the authentication operation can be performed quickly and accurately.

Note that the external appearance of the biometric authentication device 1 may be configured as a third example shown in FIG. 11 instead of the configuration shown in FIGS. 1A and 1B.
In the external configuration example shown in FIG. 11, the distance sensor 13 is not located at the lower end of the casing 16, but from the left part of the casing 16 near the opening 17 of the light shielding cover 15 into which the person to be authenticated inserts his hand. It differs from the first example shown in FIG. 1A in that a plurality of parts are provided over the part. In the third example, the distance sensor 13 measures the distance to the wrist of the person to be authenticated.

When the biometric authentication device 1 adopts the external configuration of the third example, the position detection unit 23 in the internal configuration of the biometric authentication device 1 shown in FIG. The positional relationship between the wrist of the hand moved by the authenticator and the biosensor 14 is acquired. More specifically, the position detection unit 23 determines the distance between the wrist of the person to be authenticated and each of the right part and the left part of the housing 16 based on the distance to the wrist of the person to be authenticated measured by each of the distance sensors 13. Is calculated as a measurement result, and this measurement result is output as an acquisition result of the positional relationship described above.

  Even when the external configuration of the third example is adopted, the biometric authentication device 1 performs the authentication process shown in FIG. 5 to authenticate the person to be authenticated. However, in the left and right position detection processing in S300, the positional relationship between the wrist of the person to be authenticated and the biosensor 14 detected by the position detector 23 is the positional relationship in which the wrist is on the right side with respect to the biosensor 14. A process is performed to determine whether it is present or left. Here, based on the positional relationship between the wrist of the person to be authenticated and the biometric sensor 14, if the wrist is on the right side with respect to the biometric sensor 14, the hand that the person to be authenticated presents is unnatural. It is determined that the left hand can be inserted into the opening 17 without taking the wrist angle. Further, when the wrist is in a positional relationship that is closer to the left side with respect to the biosensor 14, it is determined that the hand to be presented by the person to be authenticated is the right hand based on the same idea. For this reason, in the specific processing content of the left and right position detection processing shown in FIG. 9, the following processing is performed by the position detection unit 23 and the CPU 30.

  First, in S <b> 301, the position detection unit 23 controls each distance sensor 13, and from each distance sensor 13 to the wrist of the hand moved by the person to be authenticated in order to send it to the biometric information acquisition area in the biosensor 14. The distance is measured, and the measurement result is transferred to the CPU 30.

  Next, in S <b> 302, the CPU 30 calculates the average distance measured by the distance sensor 13 provided in the left part of the opening 17 among the distance sensors 13 provided in the casing 16 of the biometric authentication device 1. A process of calculating the measurement result n of the distance between the authenticator and the left part of the opening 17 is performed.

  Next, in S303, the CPU 30 calculates the average distance measured by the distance sensor 13 provided in the right part of the opening 17 among the distance sensors 13 provided in the casing 16 of the biometric authentication device 1. A process of calculating the measurement result m of the distance between the authenticator and the right part of the opening 17 is performed.

  Next, in S304, the CPU 30 determines the measurement result n of the distance between the person to be authenticated and the left part of the opening 17 calculated in the process of S302, and the person to be authenticated and the opening 17 calculated in the process of S303. A process of comparing the magnitude of the value with the measurement result m of the distance to the right part is performed.

  In the determination process of S304, when it is determined that the measurement result m is smaller than the measurement result n (that is, the right part of the opening 17 is closer to the subject's wrist than the left part), the CPU 30 performs the process in S305. Proceeding, a process is performed to determine that the hand to be presented by the person to be authenticated is the left hand. At this time, since the wrist of the person to be authenticated is in a positional relationship close to the right side of the opening 17, as described above, the person to be authenticated inserts into the opening 17 without taking an unnatural wrist angle. It is because it is thought that it is a left hand.

  On the other hand, in the determination process of S304, when it is determined that the measurement result n is smaller than the measurement result m (that is, the left part of the opening 17 is closer to the wrist of the person to be authenticated than the right part), the CPU 30 proceeds to S306. The process is advanced, and a process for determining that the hand to be presented by the person to be authenticated is the right hand is performed. At this time, since the wrist of the person to be authenticated is in a positional relationship close to the left side of the opening 17, as described above, the person to be authenticated inserts into the opening 17 without taking an unnatural wrist angle. It is because it is thought that it is a right hand.

In the determination process of S304, if the measurement result n and the measurement result m match, the process proceeds to S306, and for the sake of convenience, the process of determining that the hand to be authenticated is the right hand is made. Like to do. However, when the measurement result n matches the measurement result m, S3
The process may be advanced to 05, and a process of determining that the hand to be presented by the person to be authenticated becomes the left hand may be performed for convenience.

After this determination process, the left / right position detection process ends.
Regarding the other processes in FIG. 5, that is, the ID input acquisition process in S200, the hand image display process in S400a, and the collation process in S400b, the processes shown in FIGS. As a result, the biometric authentication device 1 authenticates the person to be authenticated based on the biometric information acquired from the hand of the person to be authenticated (shape information of the palm vein in this embodiment). As a result, when biometric authentication is performed, guidance on the palm position is displayed on the display unit 12 arranged at an easy-to-see position on the light shielding cover 15, and the user's hand is guided to an appropriate position. Therefore, the authentication work can be performed quickly and accurately.

In addition, the following additional remarks are disclosed regarding all the embodiments described above.
(Appendix 1)
A biometric authentication device that performs authentication of a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated,
A biometric information sensor that is provided in a casing of the biometric authentication device and acquires the biometric information;
Positional relationship acquisition means for acquiring a positional relationship between the person to be authenticated and the housing of the biometric authentication device;
A determination unit that determines whether the hand that the person to be authenticated puts in the biometric information acquisition area in the biometric information sensor is based on the positional relationship acquired by the positional relationship acquisition unit; and Display control means for displaying an image corresponding to the determination result by the determination means on the display unit;
A biometric authentication device comprising:
(Appendix 2)
The biometric authentication device according to appendix 1, wherein the positional relationship acquisition means acquires the positional relationship between the standing position of the person to be authenticated standing facing the housing of the biometric authentication device and the housing. .
(Appendix 3)
When the positional relationship acquired by the positional relationship acquisition unit is a positional relationship in which the standing position is on the right side of the housing of the biometric authentication device, the determination unit may Is determined to be a left hand, and if the positional relationship acquired by the positional relationship acquisition means is a positional relationship in which the standing position is close to the left side of the housing of the biometric authentication device, the person to be authenticated The biometric authentication device according to appendix 2, wherein the hand to be handed out is determined to be a right hand.
(Appendix 4)
The positional relationship acquisition means includes distance measurement means for measuring the distance between the person to be authenticated standing facing the casing of the biometric authentication device and each of the right part and the left part of the casing,
The determination means determines whether the hand to be presented by the person to be authenticated is the left or right hand based on the measurement result of the distance measurement means,
The biometric authentication device according to Supplementary Note 3, wherein
(Appendix 5)
The determination means sends out the person to be authenticated if the right part of the case of the biometric authentication device is closer to the person to be authenticated than the left part of the case according to the measurement result of the distance measurement means. It is determined that the hand is a left hand, and when the left part of the case of the biometric authentication device is closer to the person to be authenticated than the right part of the case, the hand to be provided by the person to be authenticated is determined to be a right hand The biometric authentication device according to appendix 4, characterized by:
(Appendix 6)
The distance measuring means includes a plurality of distance sensors that are respectively provided on the right and left sides of the casing of the biometric authentication device and each measure the distance to the person to be authenticated. The average value of the distances measured by the distance sensors provided in the unit is used as the distance between the person to be authenticated and the right part of the casing, and the distance sensors provided in the left part of the casing measure The biometric authentication device according to appendix 4, wherein the average value of the distances is the distance between the person to be authenticated and the left part of the housing.
(Appendix 7)
The positional relationship acquisition means acquires the positional relationship between the wrist of the hand moved by the person to be authenticated and the biological information sensor to be sent to the biometric information acquisition area in the biological information sensor,
The determination means determines whether the hand to be presented by the person to be authenticated is the left or right hand based on the positional relationship acquired by the positional relationship acquisition means.
The biometric authentication device according to appendix 1, characterized in that.
(Appendix 8)
When the positional relationship acquired by the positional relationship acquiring unit is a positional relationship in which the wrist is shifted to the right side with respect to the biometric information sensor, the hand that the person to be authenticated presents is a left hand. If the positional relationship acquired by the positional relationship acquisition means is a positional relationship in which the wrist is on the left side with respect to the biometric information sensor, the hand to be presented by the person to be authenticated is a right hand. The biometric authentication device according to appendix 7, wherein the biometric authentication device is determined.
(Appendix 9)
The positional relationship acquisition means includes distance measurement means for measuring the distance between the wrist and each of the right part and the left part of the biometric information sensor in the biometric authentication device,
The determination means determines, based on the measurement result of the distance measurement means, whether the biological information acquired by the biological information sensor is the left or right hand that the person to be authenticated presents.
The biometric authentication device according to appendix 8, characterized in that.
(Appendix 10)
When the right part of the biometric information sensor in the biometric authentication device is closer to the wrist than the left part of the biometric information sensor in the biometric authentication device, according to the measurement result of the distance measuring unit, When the left hand of the biometric authentication device is determined to be a left hand when the person to be authenticated is determined to be a left hand, and the left hand of the biometric authentication device is closer to the user to be authenticated than the right part of the biometric authentication device The biometric authentication device according to appendix 9, wherein the biometric authentication device is determined to be.
(Appendix 11)
Further comprising a light shielding cover provided with an opening for shielding the biological information sensor from outside light and inserting the person to be authenticated;
The light shielding cover includes the display unit.
The biometric authentication device according to appendix 1, characterized in that.
(Appendix 12)
The biometric authentication apparatus according to appendix 11, wherein the display control means displays the image of the palm of the person to be authenticated at the time of registration on the display unit by being reversed left and right.
(Appendix 13)
The display control means superimposes on the image of the palm of the person to be authenticated at the time of registration displayed on the display unit, and the live of the palm of the person to be authenticated acquired by the biometric information sensor at this time Item 12. The biometric authentication device according to appendix 11, further comprising live image display means for displaying the image on the display unit.
(Appendix 14)
14. The living body according to appendix 13, wherein the live image display means displays both the image at the time of registration of the palm of the person to be authenticated and the live image on the display unit by inverting both left and right. Authentication device.
(Appendix 15)
When displaying the live image on the display unit, the live image display unit displays the image of the palm of the person to be authenticated at the time of registration displayed on the display unit by the display control unit. 14. The biometric authentication device according to appendix 13, wherein only the contour of the palm of the person to be authenticated is displayed as an image.
(Appendix 16)
A computer program that causes a biometric authentication device that performs authentication of a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated,
In the biometric authentication device, a biometric information sensor that acquires the biometric information is provided in a housing of the biometric authentication device,
The biometric authentication device
Positional relationship acquisition means for acquiring a positional relationship between the person to be authenticated and the housing of the biometric authentication device;
A determination unit that determines whether the hand that the person to be authenticated puts in the biometric information acquisition area in the biometric information sensor is based on the positional relationship acquired by the positional relationship acquisition unit; and Display control means for displaying an image corresponding to the determination result by the determination means on the display unit;
A computer program that functions as a computer program.
(Appendix 17)
A method for guiding a user's hand for acquisition of the biometric information in a biometric authentication device that authenticates the user based on biometric information acquired from the user's hand,
The positional relationship acquisition means of the biometric authentication device acquires the positional relationship between the person to be authenticated and the housing of the biometric authentication device,
The position of whether the hand that the person to be authenticated puts into the biometric information acquisition area in the biometric information sensor that is provided in the casing of the biometric authentication device is the left or right hand Based on the positional relationship acquired by the relationship acquisition unit, the determination unit included in the biometric authentication device determines,
Display control means included in the biometric authentication device causes the display unit to display an image corresponding to a determination result by the determination means;
A biometric authentication method.
(Appendix 18)
The image according to the determination result by the determination unit that is displayed on the display unit by the display control unit is an image of guidance of the position of the authentication subject's hand with respect to the biometric information sensor. The biometric authentication device according to 1.

It is a figure which shows the 1st example of the external appearance structure of a biometrics authentication apparatus. It is a figure which shows the 2nd example of an external appearance structure of a biometrics authentication apparatus. It is a figure which shows the internal structure of a biometrics authentication apparatus. It is a figure which shows the data structure of a database. It is the figure which showed the processing content of the registration process with the flowchart. It is a figure which shows the outline | summary of an authentication process. It is a figure which shows the example of an image at the time of registration of a subject's right hand palm. It is a figure which shows the example of a display in the display part of the image of FIG. 6A. It is a figure which shows the 1st example of the superimposed display of a live image and a registration image. It is a figure which shows the 2nd example of the superimposed display of a live image and a registration image. It is the figure which showed the specific processing content of ID input acquisition processing with the flowchart. It is the figure which showed the specific processing content of the left-right position detection process with the flowchart. It is the figure which showed the specific processing content of the hand image display process and the collation process with the flowchart. It is a figure which shows the 3rd example of an external appearance structure of a biometrics authentication apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Biometric authentication apparatus 11 Numeric key switch 12 Display part 13 Distance sensor 14 Biometric sensor 15 Light-shielding cover 16 Case 17 Opening part 21 ID extraction part 22 Display control part 23 Position detection part 24 Authentication control part 30 CPU
40 Database 51 Live image 52 Registration image

Claims (7)

A biometric authentication device that performs authentication of a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated,
A biometric information sensor that is provided in a casing of the biometric authentication device and acquires the biometric information;
Positional relationship acquisition means for acquiring a positional relationship between the person to be authenticated and the housing of the biometric authentication device;
A determination unit that determines whether the hand that the person to be authenticated puts in the biometric information acquisition area in the biometric information sensor is based on the positional relationship acquired by the positional relationship acquisition unit; and Display control means for displaying an image corresponding to the determination result by the determination means on the display unit;
A biometric authentication device comprising:   2. The biometric authentication according to claim 1, wherein the positional relationship acquisition unit acquires a positional relationship between the standing position of the person to be authenticated standing facing the casing of the biometric authentication device and the casing. apparatus.   When the positional relationship acquired by the positional relationship acquisition unit is a positional relationship in which the standing position is on the right side of the housing of the biometric authentication device, the determination unit may Is determined to be a left hand, and if the positional relationship acquired by the positional relationship acquisition means is a positional relationship in which the standing position is close to the left side of the housing of the biometric authentication device, the person to be authenticated The biometric authentication device according to claim 2, wherein it is determined that the hand to be presented is a right hand. The positional relationship acquisition means acquires the positional relationship between the wrist of the hand moved by the person to be authenticated and the biological information sensor to be sent to the biometric information acquisition area in the biological information sensor,
The determination means determines whether the hand to be presented by the person to be authenticated is the left or right hand based on the positional relationship acquired by the positional relationship acquisition means.
The biometric authentication device according to claim 1. Further comprising a light shielding cover provided with an opening for shielding the biological information sensor from outside light and inserting the person to be authenticated;
The light shielding cover includes the display unit.
The biometric authentication device according to claim 1. A computer program for causing a biometric authentication device to perform authentication of a person to be authenticated based on biometric information acquired from the hand of the person to be authenticated,
In the biometric authentication device, a biometric information sensor that acquires the biometric information is provided in a housing of the biometric authentication device,
The biometric authentication device
Positional relationship acquisition means for acquiring a positional relationship between the person to be authenticated and the housing of the biometric authentication device;
A determination unit that determines whether the hand that the person to be authenticated puts in the biometric information acquisition area in the biometric information sensor is based on the positional relationship acquired by the positional relationship acquisition unit; and Display control means for displaying an image corresponding to the determination result by the determination means on the display unit;
A computer program that functions as a computer program. A method for guiding a user's hand for acquisition of the biometric information in a biometric authentication device that authenticates the user based on biometric information acquired from the user's hand,
The positional relationship acquisition means of the biometric authentication device acquires the positional relationship between the person to be authenticated and the housing of the biometric authentication device,
The position of whether the hand that the person to be authenticated puts into the biometric information acquisition area in the biometric information sensor that is provided in the casing of the biometric authentication device is the left or right hand Based on the positional relationship acquired by the relationship acquisition unit, the determination unit included in the biometric authentication device determines,
The display control means included in the biometric authentication device causes the display unit to display an image corresponding to the determination result by the determination means.
A biometric authentication method.