JP2011090620A - Bio-information read unit and personal identification apparatus - Google Patents

Abstract

A biometric information reading unit is provided that improves the authentication accuracy of personal authentication using biometric information on a finger such as a vein pattern or a fingerprint, and suppresses an increase in size and cost of an apparatus main body.
An imaging unit includes an imaging element facing a reading position where a person to be authenticated places a finger. The imaging element 22a is divided into a first area that projects a finger image in the right diagonal direction, a second area that projects the finger image in the front direction, and a third area that projects the finger image in the left diagonal direction. Yes. In the second region, an image of the subject's finger placed at the reading position as viewed from the front is projected through the second imaging lens 22c. Further, the image of the authentication subject's finger placed at the reading position viewed from the right oblique direction is refracted by the prism 22e, and the image of the authentication subject person's finger placed at the reading position seen from the left oblique direction is The light is refracted by the prism 22f and projected onto the first imaging region and the third region, respectively.
[Selection] Figure 2

Description

  The present invention relates to a biometric information reading unit that processes a finger image obtained by imaging a finger of a person to be authenticated and obtains biometric information (such as a vein pattern and a fingerprint) on the finger, and personal authentication to which the biometric information reading unit is applied. Relates to the device.

  Conventionally, personal authentication for authenticating whether or not the authentication target person is the registrant is performed using the biometric information of the authentication target person (user). For example, authentication of users in ATMs of financial institutions, authentication of employees in attendance management devices that manage employee attendance, and authentication of users in storage management devices that manage locking / unlocking in depository storage are biometric information. It is done by. The biological information includes, for example, information relating to fingers such as finger vein patterns and fingerprints, information relating to palms such as palm prints and palm vein patterns, and information relating to the entire face and face parts such as faces and irises. In personal authentication using biometric information, biometric information read from a person to be authenticated is compared with biometric information of a registered registrant, and if the degree of coincidence exceeds a predetermined threshold, the authentication is performed. The target person is authenticated as a registrant.

  If the threshold value is increased, the identity exclusion rate for determining that the user who is the registrant is not a registrant increases. Conversely, if the threshold value is decreased, another person who is not the registrant is determined to be a registrant. The rate of accepting others increases. The threshold is set according to the security level required in the device or system.

  In addition, in order to improve the authentication accuracy of personal authentication using biometric information (to suppress both the person exclusion rate and the other person acceptance rate), the finger vein pattern of the person to be authenticated is obtained from multiple directions, and the finger vein pattern in each direction A finger vein synthesis pattern is generated by superimposing the patterns, and personal authentication is performed using this finger vein synthesis pattern (see Patent Document 1).

JP 2007-328485 A

  However, the above-described Patent Document 1 has a configuration in which an imaging device is provided for each direction in which a subject's finger vein pattern is acquired. For this reason, there existed a problem that the apparatus main body enlarged and cost increased.

  An object of the present invention is to improve the authentication accuracy of personal authentication using biometric information on a finger such as a finger vein pattern or a fingerprint, and to suppress the increase in size and cost of the apparatus body, An object of the present invention is to provide a personal authentication device to which a biometric information reading unit is applied.

  The biological information reading unit according to the present invention is configured as follows in order to solve the above-described problems.

  The imaging unit arranges the image sensor at a position facing the reading position. The person to be authenticated places a finger on the reading position. The imaging device divides and assigns an imaging region for each imaging direction in which the subject's finger placed at the reading position is imaged. This imaging direction includes the front direction.

  An imaging lens is provided for each imaging region. An image incident on the corresponding imaging lens is projected on each imaging region. Furthermore, for an imaging lens to which an imaging region where the imaging direction is not the front direction is assigned, an optical member (such as a prism or a reflection mirror) that refracts and enters the finger image of the subject in the corresponding imaging direction is provided.

  Then, the biometric information acquisition unit processes the finger image of the authentication target person imaged by the imaging unit for each imaging direction, and acquires the biometric information related to the finger of the authentication target person.

  In this manner, captured images captured from a plurality of imaging directions including the front direction can be projected onto one imaging element with respect to the finger of the subject placed at the reading position. That is, with respect to the finger of the subject placed at the reading position, a captured image captured from a plurality of directions with one imaging unit can be obtained without providing an imaging unit for each imaging direction. Therefore, an increase in size and cost of the main body can be suppressed.

  The personal authentication apparatus according to the present invention is an application of the above-described biometric information reading unit.

  In this personal authentication device, the authentication unit collates the registered biometric information registered in advance for each registrant for each imaging direction with the biometric information of the person to be authenticated acquired by the biometric information acquisition unit. Authenticates whether the user is a registrant. Thereby, the authentication precision of the personal authentication using the biometric information concerning fingers, such as a vein pattern and a fingerprint, can be improved.

  The authentication unit, for example, for each imaging direction, the biometric information of the person to be authenticated acquired by the biometric information acquisition unit, and the biometric information of the corresponding direction stored in the registration information storage unit for each registrant, And comprehensively authenticating whether or not the person to be authenticated is a registrant from the degree of coincidence obtained for each imaging direction.

  Further, if the determination unit determines whether or not the authentication target person is a registrant based on the degree of coincidence obtained in each imaging direction in the authentication unit, the determination condition storage unit stores the determination condition. By doing so, it can be easily changed according to the system to which the security level is applied.

  According to the present invention, it is possible to improve the authentication accuracy of personal authentication using biometric information relating to a finger such as a vein pattern or a fingerprint, and to suppress an increase in size and cost of the apparatus main body.

It is a block diagram which shows the structure of the principal part of a personal authentication apparatus. It is the schematic which shows the structure inside a biometric information reading unit. It is a figure explaining the allocation of the imaging area with respect to the imaging direction of an imaging device. It is a figure which shows registrant information. It is a flowchart which shows the registration process which registers biometric information. It is a flowchart which shows an authentication process.

  Hereinafter, a personal authentication apparatus according to an embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing the configuration of the main part of the personal authentication device according to this embodiment. The personal authentication device 1 includes a biometric information reading unit 2 and a verification unit 3. The biometric information reading unit 2 acquires biometric information (here, referred to as a finger vein pattern) on the finger of the person to be authenticated. The verification unit 3 uses the biometric information of the person to be authenticated acquired by the biometric information reading unit 2 to perform personal authentication processing for authenticating whether or not the person to be authenticated is a registrant. The biometric information reading unit 2 and the verification unit 3 are connected by a data communication line.

  The biological information reading unit 2 includes a control unit 21, an imaging unit 22, an illumination unit 23, an image processing unit 24, and an input / output unit 25. The control unit 21 controls the operation of each unit of the biological information reading unit 2. The imaging unit 22 images the finger of the person to be authenticated placed at the reading position from a plurality of directions including the front direction. Here, the finger of the person to be authenticated placed at the reading position is imaged in three directions of the right diagonal direction, the front direction, and the left diagonal direction. The illumination unit 23 includes a light source that illuminates the authentication subject's finger when the imaging unit 22 images the authentication subject's finger. The image processing unit 24 processes the finger image of the person to be authenticated captured by the image capturing unit 22 for each image capturing direction, and extracts the feature amount of the finger vein pattern. The input / output unit 25 inputs / outputs data to / from the verification unit 3.

  FIG. 2 is a schematic diagram showing the internal structure of the biological information reading unit. The imaging unit 22 includes an imaging element 22a disposed at a position facing the reading position where the person to be authenticated places a finger. The biometric information reading unit 2 images the finger of the person to be authenticated placed at the reading position from the three directions of the front direction, the right diagonal direction, and the left diagonal direction as described above. As shown in FIG. 3, the imaging element 22a is an element of n × m pixels. The imaging element 22a is divided into three areas: a first area that projects a finger image in the right diagonal direction, a second area that projects the finger image in the front direction, and a third area that projects the finger image in the left diagonal direction. It is divided.

  The imaging unit 22 includes a first imaging lens 22b that projects an image on a first area of the imaging element 22a, a second imaging lens 22c that projects an image on a second area of the imaging element 22a, and imaging. A third imaging lens 22d that projects an image on the third region of the element 22a is provided. The first imaging lens 22b is disposed to face the first region of the imaging element 22a. The second imaging lens 22c is disposed so as to face the second region of the imaging element 22a. The third imaging lens 22d is disposed so as to face the third region of the imaging element 22a. Also, as shown in FIG. 2, the second area faces the reading position where the subject's finger is placed. For this reason, the image of the subject's finger placed at the reading position as viewed from the front is projected onto the second region through the second imaging lens 22c.

  In addition, a prism 22e is disposed between the first imaging lens 22b and the reading position in order to project a finger image in the diagonally right direction through the first imaging lens 22b onto the first region of the imaging element 22a. Yes. An image of the authentication subject's finger placed at the reading position when viewed from the right oblique direction is refracted by the prism 22e and projected onto the first imaging region through the first imaging lens 22b.

  Similarly, a prism 22f is disposed between the third imaging lens 22d and the reading position in order to project a finger image in the left oblique direction onto the third region of the imaging element 22a through the third imaging lens 22d. ing. An image of the authentication subject's finger placed at the reading position when viewed from the left oblique direction is refracted by the prism 22f and projected onto the third region through the third imaging lens 22d.

  The first imaging lens 22b, the second imaging lens 22c, and the third imaging lens 22d may be individual lenses, but by using a lens array in which three lenses are arranged in a row, The configuration related to the holding mechanism can be simplified.

  The illumination unit 23 includes LEDs 23a to 23c that illuminate the finger of the person to be authenticated placed at the reading position. The LEDs 23a to 23c emit light with near infrared light. The illumination unit 23 performs control related to turning on / off the LEDs 23a to 23c. Further, the three LEDs 23a to 23c are arranged in the direction of irradiating near-infrared light in the direction in which the subject's finger placed at the reading position is imaged.

  In addition, although the case where three LED23a-23c is used as illumination light is taken as an example here, the number may be any number. Moreover, it may replace with LED23a-23c and may utilize another light source as illumination light. The illumination light may be visible light. In the example shown in FIG. 2, the LEDs 23a to 23c are arranged on the side facing the image sensor 22a, but are arranged on the image sensor 22a side so as to illuminate the finger of the subject placed at the reading position. You may comprise.

  Returning to FIG. 1, the configuration of the verification unit 3 will be described. The verification unit 3 includes a control unit 31, a storage unit 32, an input / output unit 33, and a communication unit 34. The control unit 31 controls the operation of each unit of the verification unit 3. The storage unit 32 stores, for each registrant, registrant information in which the feature amount of the registrant's finger vein pattern is registered. As shown in FIG. 4, the registrant information includes, for each registrant, the feature amount of the finger vein pattern obtained from the captured image obtained by imaging the registrant's finger from the right oblique direction, and the registrant's finger in the front direction. The finger vein pattern feature quantity obtained from the captured image taken from the image and the finger vein pattern feature quantity obtained from the captured image obtained by imaging the registrant's finger from the diagonally left direction are registered in association with each other.

  The input / output unit 33 inputs / outputs data to / from the biological information reading unit 2. The communication unit 34 performs data communication with the host device. The host device is an ATM, an attendance management device, a storage management device, or the like to which the personal authentication device 1 is applied.

  In addition, the control unit 31 has a nonvolatile memory, and stores a threshold value for determining the matching level with respect to the matching degree of the biological information (here, the finger vein pattern) in four stages. Specifically, three threshold values X, Y, and Z (X> Y> Z) to be compared with the matching degree S are stored. If the matching degree S is greater than the threshold value X, the control unit 31 determines that the matching level is “excellent”. If the matching degree S is smaller than the threshold value X and larger than the threshold value Y, the matching level is determined as “good”. Also, if the degree of coincidence S is smaller than the threshold Y and larger than the threshold Z, the coincidence level is determined to be “permitted”. Furthermore, if the matching degree S is smaller than the threshold value Z, the matching level is determined as “impossible”.

  Moreover, the control part 31 has memorize | stored the determination conditions which determine whether an authentication object person is a registrant in the non-volatile memory using the matching level of each direction. This determination condition is set according to the device or system to which the personal authentication device 1 is applied.

  For example, when applied to an ATM or the like that requires high security, a determination condition for authenticating a person to be authenticated as a registrant only when the match level is determined to be “excellent” in all three directions. Is set.

  In addition, when applied to attendance and attendance management systems, etc., in order to reduce the person's exclusion rate (the ratio of authenticating the registrants who are not registrants) and improve convenience, When the matching level is determined to be “excellent” for any two of the above, a determination condition for authenticating the person to be authenticated as a registrant is set.

Furthermore, in the storage management device where convenience is given priority over the security level,
(1) If the match level is determined to be “excellent” for any one of the three directions,
(2) If the match level is determined to be “good” for any two of the three directions,
(3) When it is determined that all the matching levels in the three directions are “Yes” or higher,
In any case, a determination condition for authenticating the person to be authenticated as a registrant is set.

  Therefore, the personal authentication device 1 can be easily changed according to the system to which the security level is applied by changing the determination condition.

  Here, the matching level to be determined is set to four stages, but the number of stages may be three or less or may be five or more. The determination condition may be set according to the number of stages.

  Next, the operation of the personal authentication device 1 will be described. The personal authentication device 1 can perform not only a personal authentication process for authenticating whether or not an authentication target person is a registrant but also a registration process for registering biometric information by a registration target person.

  FIG. 5 is a flowchart showing a registration process in which a person to be registered registers biometric information. A person who registers biometric information in this registration process becomes a registrant. In the operation unit of the host device to which the personal authentication device 1 is connected, personal information of a person who will register biometric information is input. The personal information input here is an address, name, account number, employee number, storage number, and the like, and items necessary for the apparatus and system to which the apparatus 1 is applied are determined in advance. When receiving the input of personal information necessary for registration, the host device instructs the personal authentication device 1 to start registration processing. This registration processing start instruction may include the personal information input this time, or may be only the ID assigned to the personal information (in this case, the input personal information And the assigned ID are stored and managed by the host device in association with each other, and the ID may be an account number, employee number, storage number, etc., or may be generated separately (such as a serial number). There may be.

  The personal authentication device 1 starts the registration processing shown in FIG. 5 when there is an instruction to start the registration processing from the host device. In the biometric information reading unit 2, the personal authentication device 1 waits for the finger of a person who registers biometric information (hereinafter referred to as a registration target person) to be placed at the reading position (s1). In the biological information reading unit 2, when the finger of the person to be registered is placed at the reading position, the illumination unit 23 lights the LEDs 23a to 23c (s2). Thereafter, the imaging unit 22 captures an image of the finger of the person to be registered placed at the reading position (s3).

  In s3, the image of the finger from the right oblique direction of the registration target person projected on the first area of the image sensor 22a, and the front direction of the registration target person projected on the second area of the image sensor 22a. The image of the finger and the image of the finger from the diagonally left direction of the person to be registered projected on the third area of the image sensor 22a are individually captured. As described above, an image of the finger placed at the reading position as viewed from the right oblique direction is projected through the prism 22e and the first imaging lens 22b on the first region of the imaging element 22a. In addition, an image of the finger placed at the reading position as viewed from the front is projected through the second imaging lens 22c onto the second region of the imaging element 22a. Furthermore, an image of the finger placed at the reading position as viewed from the left oblique direction is projected through the prism 22f and the first imaging lens 22d on the third region of the imaging element 22a.

  When the biometric information reading unit 2 captures images from the three directions (right diagonal direction, front direction, and left diagonal direction) applied to the finger of the person to be registered, the LEDs 23a to 23c that are turned on in s2 are turned off (s4). Further, the biometric information reading unit 2 processes the image of the finger of the person to be registered captured in s3 by the image processing unit 24, and extracts the feature amount of the finger vein pattern for each direction (s5). The biometric information reading unit 2 determines whether or not the current biometric information has been properly read based on whether or not the feature amount of the finger vein pattern has been properly extracted from the images in the three directions (s6). In s6, it is determined that the biometric information can be read properly only when the feature amount of the finger vein pattern can be extracted from all the images in the three directions. In other words, when the feature quantity of the finger vein pattern cannot be extracted from the image in any direction, it is determined that the biometric information cannot be read properly.

  If the biometric information reading unit 2 determines that biometric information could not be read properly in s6, it performs error processing (s7) and ends this processing. The error process related to s7 is a process of notifying the host device that biometric information has not been properly read.

  Alternatively, when it is determined in s6 that the biometric information has not been properly read, the process may return to s2 and repeat the above-described processing. That is, a configuration may be adopted in which the finger image of the person to be registered is picked up again, and the processing for extracting the feature amount of the finger vein pattern is performed again. In this case, if the reprocessing is repeated several times (for example, three times) and the biometric information cannot be read properly, the error processing may be performed in s7.

  If the biometric information reading unit 2 determines that the biometric information can be properly read in s6, the biometric information reading unit 2 notifies the collation unit 3 of the feature amount of the finger vein pattern extracted from the finger image in each direction in s5. The verification unit 3 includes the personal information and ID included in the registration processing start instruction notified this time from the host device, and the feature amount of the finger vein pattern in each direction extracted by the biometric information reading unit 2 in s5. The registered registrant information is registered in the storage unit 32 (s8), and this process is terminated.

  As a result, for the registration target person this time, the feature amount of the finger vein pattern obtained from the captured image captured from the right diagonal direction, the feature amount of the finger vein pattern obtained from the captured image captured from the front direction, and the diagonal left direction The registrant information associated with the feature amount of the finger vein pattern obtained from the captured image captured from the image is registered in the storage unit 32. That is, the current registration target person is registered as a registrant.

  Next, an authentication process for authenticating whether or not the authentication target person is a registrant will be described. FIG. 6 is a flowchart showing the authentication process. When there is an authentication request, the personal authentication device 1 starts the processing shown in FIG. The authentication request may be configured to be instructed from a higher-level device, or may be configured to determine that an authentication request has been made when it is detected that the authentication subject's finger is placed at the reading position. Good. In the biological information reading unit 2, the illumination unit 23 turns on the LEDs 23a to 23c (s11). Thereafter, the imaging unit 22 captures an image of the finger of the person to be authenticated placed at the reading position (s12). In s12, the image of the finger from the right oblique direction of the person to be authenticated projected on the first area of the image sensor 22a, and the front direction of the person to be authenticated projected on the second area of the image sensor 22a. The image of the finger and the image of the finger from the diagonally left direction of the person to be authenticated projected onto the third area of the image sensor 22a are individually captured. When the biometric information reading unit 2 captures images from the three directions (right diagonal direction, front direction, and left diagonal direction) applied to the finger of the person to be registered, the LEDs 23a to 23c lit in s11 are turned off (s13). The process concerning s11-s13 is the same as the process concerning s2-s4 mentioned above.

  In the image processing unit 24, the biometric information reading unit 2 extracts the feature amount of the finger vein pattern for each finger image in the three directions captured by the imaging unit 22 in s12 (s14). The biometric information reading unit 2 notifies the matching unit 3 of the feature amount of the finger vein pattern in each direction extracted in s14.

  The collation unit 3 has the feature quantity of the finger vein pattern notified from the biometric information reading unit 2 for each of the right diagonal direction, the front direction, and the left diagonal direction, and the corresponding registrant stored in the storage unit 32. The feature amount of the finger vein pattern in the direction to be checked is collated, and the registrant having the highest degree of matching is determined (s15). In s15, the registrant having the highest degree of coincidence for each direction is not necessarily the same registrant. In other words, the registrant with the highest degree of coincidence may be different for each direction, or the registrant with the highest degree of coincidence is the same for the two directions, and the degree of coincidence is the largest for the remaining one direction. Some registrants may be different.

  The collation unit 3 sets the registrant in the direction having the highest degree of coincidence among the registrants extracted in s14 as the current determination target registrant (s16). The verification unit 3 authenticates whether or not the current authentication target person is the determination target registrant set in s16 in the processes related to s17 and s18 below. Specifically, for each extracted finger vein pattern in the three directions, the matching levels for the matching degree with the finger vein pattern registered for the determination target registrant are “excellent”, “good”, “good”, “ It is determined whether it is “impossible” (s17). The determination of the coincidence level relating to s17 is performed by comparing the coincidence degree with the three threshold values X, Y, and Z described above.

  The verification unit 3 determines whether or not the authentication target person is the determination target registrant set in s16 depending on whether or not the matching level in each direction determined in s17 satisfies the determination condition stored in the storage unit 32. Authentication is performed (s18). In s18, if the matching level in each direction determined in s17 satisfies the determination condition stored in the storage unit 32, the authentication target person is determined to be the determination target registrant set in s16. Conversely, if the matching level in each direction determined in s17 does not satisfy the determination condition stored in the storage unit 32, the authentication target person is determined not to be the determination target registrant set in s16.

  As described above, this determination condition is set according to a security level required in an apparatus or system to which the present apparatus is applied. For example, when applied to ATM, if the matching level is “excellent” in all directions, it is determined that the authentication target person is the determination target registrant set in s16.

  The verification unit 3 notifies the authentication result in s18 to the higher-level device (s19), and ends this process.

  The host device performs transaction processing, deposit / withdrawal management processing, storage management processing, and the like according to the notified authentication result.

  As described above, the personal authentication device 1 processes the finger image captured from three directions for the authentication target person, and uses the feature amount of the finger vein pattern extracted from the image in each direction, so that the authentication target person is the registrant. Authenticate if there is. Therefore, the authentication accuracy can be sufficiently improved.

  In addition, since it is not necessary to provide an imaging unit for each direction in which the finger image of the person to be authenticated is captured, an increase in the size of the apparatus main body and an increase in cost can be suppressed.

  In addition, by changing the determination condition, personal authentication can be performed at a security level required in an apparatus or system to which the apparatus 1 is applied. That is, the present apparatus 1 can be applied to various apparatuses and systems without being limited to the required security level.

  In the above-described example, authentication of the person to be authenticated is performed using a finger vein pattern. In this case, the feature amount of the fingerprint pattern may be extracted instead of the feature amount of the finger vein pattern described above.

  Note that the personal authentication device 1 may set the determination of the matching level with respect to the matching degree S and the determination condition in consideration of the installation environment and the like. The installation environment referred to here is the magnitude of the influence of ambient light on the image captured by the imaging unit 22. The determination of the coincidence level with respect to the coincidence degree S may change the above-described threshold value, or may change the coincidence level determination method for the coincidence degree S. In this way, personal authentication can be performed in consideration of the quality difference of the extracted feature quantity of the finger vein pattern.

  In the above example, all registrants whose registrant information is registered are targeted to authenticate whether or not the person to be authenticated is a registrant. It is good also as a structure which authenticates whether an object person is the registrant who was provided with input ID.

DESCRIPTION OF SYMBOLS 1 ... Personal authentication apparatus 2 ... Unit 3 ... Collation unit 21 ... Control part 22 ... Imaging part 22a ... Imaging element 22b, 22c, 22d ... Imaging lens 22e, 22f ... Prism 23 ... Illumination part 23a, 23b, 23c ... LED
24 ... Image processing unit 31 ... Control unit 32 ... Storage unit 33 ... Input / output unit 34 ... Communication unit

Claims (5)

An imaging unit that images the finger of the subject placed at the reading position from a plurality of imaging directions including the front direction;
A biometric information acquisition unit that processes the finger image of the subject imaged by the imaging unit for each imaging direction, and acquires biometric information on the subject's finger;
The imaging unit
An image sensor that is arranged at a position facing the reading position and that is assigned by dividing an imaging region for each imaging direction;
An imaging lens for projecting an incident image for each imaging region;
An optical member that refracts and enters the finger image of the subject in the corresponding imaging direction for each imaging lens to which an imaging region whose imaging direction is not the front direction is assigned;
Biometric information reading unit. An imaging unit that images the finger of the subject placed at the reading position from a plurality of imaging directions including the front direction;
For each imaging direction, a biometric information acquisition unit that processes a finger image of the subject imaged by the imaging unit and acquires biometric information on the subject's finger;
For each imaging direction, the registered biometric information registered in advance for each registrant and the biometric information of the subject acquired by the biometric information acquisition unit are collated to authenticate whether the subject is a registrant. And an authentication unit
The imaging unit
An image sensor that is arranged at a position facing the reading position and that is assigned by dividing an imaging region for each imaging direction;
An imaging lens for projecting an incident image for each imaging region;
An optical member that refracts and enters the finger image of the subject in the corresponding imaging direction for each imaging lens to which an imaging region whose imaging direction is not the front direction is assigned;
Personal authentication device.   The authentication unit collates the biometric information of the subject acquired by the biometric information acquisition unit with the biometric information of the corresponding direction stored in the registration information storage unit for each registrant for each imaging direction, The personal authentication device according to claim 2, wherein, based on the degree of coincidence obtained for each imaging direction, whether or not the subject person is a registrant is comprehensively authenticated.   The personal authentication device according to claim 2, further comprising a determination condition storage unit that stores a determination condition related to authentication of whether or not the target person is a registrant in the authentication unit.   The authentication unit determines the degree of coincidence between the biometric information of the subject acquired by the biometric information acquisition unit and the biometric information of the corresponding direction stored in the registration information storage unit for each registrant for each imaging direction. It is determined which of the matching levels is divided into three or more stages, and whether or not the subject person is a registrant is comprehensively verified based on the matching levels obtained for each imaging direction. The personal authentication device according to any one of the above.

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