JP2011008529A - Biometrics device, biometrics method, and its program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the false rejection rate, and to suppress the overload of registration data other than biological information in the case of collation.SOLUTION: A biometrics device 20 is provided with: a data storage part 24 for storing at least either biological information whose biometrics is possible or its feature point and the registration date and time; a biological information collation part 22a for collating the feature point of the biological information of an authentication candidate 1 with the feature point of the biological information registered by the data storage part 24, and for determining the possibility/impossibility of biometrics; a date and time determination part 22b for comparing the collation date and time with the registration date and time of the data storage part 24, and for, when the interval is equal to or more than the maximum non-update period M, performing display to request the update and registration of the biological information at a display device; a biological information registration/changing part 21 for updating and registering at least either the received biological information of the authentication candidate 1 or its feature point and the registration date and time in the data storage part 24; and a security release signal output part 23 for, when the biometrics is possible, and the interval is less than the maximum non-update period M, outputting a security release signal to security equipment 30.

Description

  The present invention relates to a biometric authentication apparatus, a biometric authentication method, and a program for authenticating a person using biometric information such as veins.

In general, a biometric authentication device acquires biometric information of a person to be authenticated in advance by a reading device and stores it in a storage device such as an IC card or a RAM (Random Access Memory) in the authentication device.
At the time of authentication, the personal authentication is performed by checking the biometric information of the person to be authenticated newly acquired by the reading device with the biometric information stored in advance in the storage device and measuring the similarity between the two.
In such a biometric authentication method, distribution of read information result data due to changes in biometric information over time, physical condition of the person to be authenticated, reading environment (for example, temperature, humidity), etc. occurs, and the rejection rate increases. There is a problem.

As a solution to this problem, Patent Document 1 discloses a method for reducing the identity rejection rate of a person to be authenticated by setting a threshold value low when the number of passages exceeds a predetermined number when performing authentication.
Patent Document 2 discloses a method for updating an environment variable by setting a low threshold value in order to reduce an authentication object person rejection rate due to insufficient learning of an input environment.

JP-A-8-96135 (paragraphs 0025, 0031, FIG. 3, FIG. 4, etc.) Japanese Patent Laying-Open No. 2006-31103 (paragraphs 0047, 0048, FIG. 8, etc.)

By the way, the means for reducing the person rejection rate due to the secular change and the difference in the biometric information input environment in the above-described conventional biometric authentication method has the following problems.
In the case of changing the threshold value based on the number of passes in Patent Document 1, the authentication accuracy is lowered when the authentication is performed more than the specified number of times, resulting in a reduction in security. In addition, the method of lowering the threshold value can reduce the rejection rate of the person, but there is a problem that the security level cannot be maintained because changes in biological information over time are not taken into consideration.

  The method of determining a threshold value using environment variables of Patent Document 2 and increasing the accuracy of authentication ensures security, but requires more data to be referred to at the time of biometric information matching, and is required for a traffic control device or the like. There is a risk of impairing immediacy. In addition, there is a problem that the registration data itself becomes enormous and overloads the storage device.

  In view of the above situation, the present invention realizes a reduction in the rejection rate while ensuring a certain level of security, and does not increase reference data at the time of collation, and stores registration data other than biometric information accompanying authentication. An object of the present invention is to provide a biometric authentication device, a biometric authentication method, and a program thereof that do not overload the device.

  In order to achieve the above object, a biometric authentication apparatus according to the first aspect of the present invention is a biometric authentication apparatus that performs biometric authentication of a person to be authenticated and outputs a security release signal to a security device when biometric authentication is possible, A data storage unit that stores at least one of biometric information that can be biometrically authenticated and a feature point of biometric information, a registration date and time thereof, a feature point of biometric information acquired from the person to be authenticated, and the data in advance A biometric information collating unit that collates feature points of biometric information registered in the storage unit and determines whether biometric authentication is possible or not based on the similarity, a biometric information collation date and time by the biometric information collating unit, and the data When the registration date and time of the biometric information stored in the storage unit is compared and the interval is equal to or longer than a preset maximum non-update period, a display requesting biometric information update registration to the authentication subject is displayed A date / time determination unit to be performed by the display device, at least one of the biometric information of the person to be authenticated and the feature point of the biometric information received from the biometric information reader according to the update registration request by the date / time determination unit, and the registration date / time Are updated and registered in the data storage unit, and the biometric information collating unit determines that biometric authentication is possible, and the date and time determining unit is less than the maximum non-updated period. And a security release signal output unit for outputting a security release signal to the security device.

  According to a second aspect of the present invention, there is provided a biometric authentication method including a data storage unit that stores at least one of biometric information that can be biometrically authenticated and a feature point of biometric information, and a registration date and time thereof. A biometric authentication method using a biometric authentication device that performs biometric authentication and outputs a security release signal to a security device when biometric authentication is possible, and features of biometric information acquired from the person to be authenticated by a biometric information matching unit The biometric information feature point registered in advance in the data storage unit, and determines whether biometric authentication is possible or not based on the degree of similarity. The comparison date and time are compared with the registration date and time of the biometric information stored in the data storage unit, and when the interval is equal to or greater than a preset maximum unupdated period, The biometric information and the biometric information of the person to be authenticated received from the biometric information reader according to the update registration request by the biometric information registration / change unit according to the update registration request by the biometric information registration / change unit. At least one of the points and the registration date and time thereof are updated and registered in the data storage unit, the biometric information collation unit determines that biometric authentication is possible by the security release signal output unit, and the date and time determination unit When the interval is less than the maximum non-update period, a security release signal is output to the security device.

  A program for a biometric authentication apparatus according to the third aspect of the present invention is a program for causing a computer to realize the biometric authentication method of the second aspect of the present invention.

  According to the present invention, while ensuring a certain level of security, a reduction in the rejection rate is realized, reference data does not increase at the time of verification, and registration data other than biometric information associated with authentication is stored in the storage device. A biometric authentication device, a biometric authentication method, and a program thereof that do not become overloaded can be realized.

It is a system configuration figure of a security system of an embodiment concerning the present invention. It is a functional lineblock diagram of a security system of an embodiment. It is a flowchart of the operation | movement of security cancellation | release by the biometrics apparatus of embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a system configuration diagram of a security system S according to an embodiment of the present invention.
<Overall configuration of security system S>
The security system S according to the embodiment is a security system provided with an automatic biometric information update method, and includes a security device 30 that the authentication target person 1 requests security release, and a finger vein of the authentication target person 1 when security release is requested. The biometric information reader 10 that reads biometric information, the biometric information authentication device 20 that determines whether authentication is possible based on the degree of coincidence by comparing the read biometric information with already registered biometric information, and the biometric information authentication device 20 via the Internet And a control terminal 40 for accessing via the network NW.
The network NW may be a LAN (Local Area Network) other than the Internet, a WAN (Wide Area Network), or the like, and is not limited to the Internet.

<Security device 30>
The security device 30 shown in FIG. 1 includes an electric lock for an automatic door d, a flapper gate used for entrance / exit management, a parking gate for opening and closing a parking lot, a shutter for a building entrance, and fire prevention for an area in the building. There are various devices as the security device 30 as long as it is a device that holds security, such as a shutter, and is not limited.

<Biological information reader 10>
The biometric information reader 10 shown in FIG. 1 is a device that is connected to the biometric information authentication device 20 and transmits a read biometric information signal, and includes a finger vein reader, a face image detector, and the like. The biometric information reader 10 is a device that reads biometric information such as the finger vein, face, retina, iris, fingerprint, and voiceprint of the person 1 to be authenticated.
FIG. 2 is a functional configuration diagram of the security system S.
The biometric information reader 10 includes a biometric information reading unit 11 that reads biometric information and a message display unit (display device) 12 that displays a message to the person 1 to be authenticated.

  For example, in the case where the biometric information reader 10 is a finger vein reader, the biometric information reader unit 11 clearly articulates the vein portion from the vein pattern image obtained by transmitting the near infrared light through the finger of the person 1 to be authenticated by an artificial intelligence technique. Detected as a simple vein pattern. As shown in FIG. 1, the finger vein reader that is the biometric information reader 10 is a finger vein reader that reads the finger vein pattern of the person 1 to be authenticated in front of the security device 30 of the automatic door d. In this case, in the biometric information feature point table 24a described later of the biometric information authentication device 20, information on the feature points of the vein pattern of the person 1 to be authenticated who releases the security of the security device 30 is registered in advance.

<Biometric information authentication apparatus 20>
A biometric authentication apparatus 20 shown in FIG. 1 is a computer that performs various controls such as input / output, access, and communication control, and includes a central processing unit (CPU) and a storage device (main storage device and HDD (Hard (Hard Disk)). Auxiliary storage devices such as Disk Drive).
The biometric information authentication apparatus 20 includes an input interface (not shown) such as an amplification circuit and an A / D conversion circuit that converts a signal from the biometric information reader 10 into an input signal suitable for the biometric information authentication apparatus 20, and biometric information. An output interface (not shown) for controlling the security device 30 according to an output signal that is a control signal from the authentication device 20 is provided.

The auxiliary storage device of the biometric information authentication device 20 includes a biometric information registration / change unit 21 for operating the security system S, a biometric information collation unit 22a, a date / time determination unit 22b, and a security for realizing a security release signal output unit 23. System programs are stored in machine language.
The CPU of the biometric information authentication device 20 loads and executes the security system program in the main storage device, whereby the biometric information registration / change unit 21, the biometric information collation unit 22a, the date / time determination unit 22b, and the security release signal output unit 23. Is realized, and the biometric information authentication device 20 performs security release operation control.

The auxiliary storage device also stores a data storage unit 24 such as an RDB (Relational Database) that stores various data of the security system S.
The data storage unit 24 includes a biometric information feature point table 24a that stores information including feature points of biometric information when security is released, and a registration date and time when the biometric information feature points are newly registered or updated. Is stored in the registration date / time table 24b stored from the system date / time and the maximum threshold value, the minimum threshold value, the threshold change width, etc. relating to the match between the read biological information and the biological information stored in the biological information feature point table 24a. And a value table 24c.

The threshold value is a matching ratio of feature points for determining successful authentication (authentication possible) or authentication failure (authentication unsuccessful) in the collation of the read biological information and the biological information stored in the biological information feature point table 24a. Yes, the maximum threshold value and the minimum threshold value are values that determine the maximum value and the minimum value of the matching ratio that are the authentication success conditions. Further, the threshold change width is a decrease width of the matching ratio that is repeatedly subtracted from the maximum threshold in the biometric information collating process in the later-described security release operation. For example, in the case of finger vein authentication, the maximum threshold value, minimum threshold value, threshold change width, and the like are set by tracking the edge of a finger vein feature point.
The biometric authentication using the biometric information reader 10 is an authentication log function, that is, biometric authentication history information is recorded in the auxiliary storage device in the biometric information authentication device 20, and it is confirmed who entered the room by checking the log. It is configured to be able to.
Furthermore, in the auxiliary storage device, a log of biometric information or the like of a person whose security release is not permitted, that is, authentication history information is stored together with the date and time when biometric authentication was performed.

<Control terminal 40>
A control terminal 40 shown in FIG. 1 is a terminal device such as a PC (Personal Computer) that can be input / output to / from the biometric authentication device 20, a PDA (Personal Digital Assistants: portable information terminal) that can be displayed on a browser, and a mobile phone. Owned or carried by the person in charge of building management.
The control terminal 40 is installed with a web browser, e-mail software, or the like that requests data from the biometric authentication device 20 or displays received data, and these software are executed when the security system S is in operation. The

The control terminal 40 can communicate with the data storage unit 24 of the biometric authentication device 20, and is used for setting the maximum threshold value, the minimum threshold value, and the threshold change width of the setting value table 24c shown in FIG. Threshold setting means (not shown) including a screen or the like is configured in the control terminal 40, the biometric information authentication device 20, and the like. With this threshold setting means, the control terminal 40 can be used to set the maximum threshold value, minimum threshold value, and threshold change width.
Each value of the maximum threshold value, the minimum threshold value, and the threshold change width can be changed by the threshold setting means by acquiring e-mail data and the like, and the setting form can be selected as appropriate.

<Security Release Operation by Biometric Information Authentication Device 20>
Next, the security release operation by the biometric authentication device 20 will be described with reference to FIG. FIG. 3 is a flowchart of the security release operation by the biometric information authentication apparatus 20.
First, in step 1 (S1) of FIG. 3, as shown in FIG. 1, when the person 1 to be authenticated is in the biometric information, for example, finger vein authentication, the finger is brought close to the biometric information reader 10 of the sensor. The biometric information reading unit 11 (see FIG. 2) of the biometric information reader 10 reads the biometric information of the subject 1 and extracts the feature points of the biometric information as signals to the biometric information matching unit 22a of the biometric information authentication device 20. Send.

Subsequently, in step 2 (S2) of FIG. 3, the biometric information matching unit 22a (see FIG. 2) of the biometric information authentication device 20 stores biometric information similar to the feature points of the biometric information received from the biometric reader 10. Using the feature points of the biometric information stored in the biometric information feature point table 24a of the data storage unit 24, the biometric information is collated based on the maximum threshold value of the setting value table 24c of the data storage unit 24.
As a result of the biometric information collation, a feature point similar to the feature point of the biometric information received from the biometric information reader 10 exists in the biometric information feature point table 24a of the data storage unit 24 (step 2 (S2) in FIG. 3). YES), the authentication is successful (authentication is possible), and the process proceeds to step 4 (S4).

On the other hand, as a result of collation of the biometric information in step 2 (S2) of FIG. 3, feature points similar to the feature points of the biometric information received from the biometric information reader 10 are stored in the biometric information feature point table 24a of the data storage unit 24. If it does not exist (NO in step 2 (S2) in FIG. 3), it is an authentication failure (authentication failure), and the process proceeds to step 3 (S3) in FIG.
In step 3 (S3) of FIG. 3, the biometric information collation operation in step 2 (S2) is performed by subtracting the threshold change width of the setting value table 24c from the maximum threshold value (MAX) of the setting value table 24c of the data storage unit 24. The threshold value (X = i = MAX-1) is used as a reference. Here, a case where the threshold change width is set to 1 is illustrated, but an arbitrary value can be set as the threshold change width.

  If the result of collation of the biometric information in step 3 (S3) of FIG. 3 is authentication failure (authentication rejected), step 3 (S3) is repeated, that is, the value of i is incremented by 1 from MAX-1 to MIN. Subtraction is repeated and step 3 (S3) is repeated, but the threshold value (X = i = MAX-1) obtained by subtracting the threshold change width of the setting value table 24c from the maximum threshold value of the setting value table 24c of the data storage unit 24 is the setting value table. When the value falls below the minimum threshold value (= MIN) of 24c (X = i = MAX-1 <MIN) (NO in step 3 (S3) of FIG. 3), the process proceeds to step 6 (S6) of FIG. A message notifying that authentication has failed is displayed on the message display unit 12 (see FIG. 2) of the reader 10.

On the other hand, if the result of the biometric information collation in step 3 (S3) in FIG. 3 indicates that authentication is successful (authentication is possible) (YES in step 3 (S3) in FIG. 3), the process proceeds to step 4 (S4) in FIG. To do.
In step 4 (S4) of FIG. 3, the date and time determination unit 22b of the biometric information authentication device 20 performs the current biometric information collation date and time acquired from the system date and time of the biometric information authentication device 20 and the registration date and time table of the data storage unit 24. 24b is compared with the registration date / time of the feature point of the biometric information of the same person 1 to be authenticated (new registration date / time for new registration, last update registration date / time for update registration), and the interval (= not yet) It is determined whether or not the update period is longer than a preset period (= maximum non-update period M).

  If it is determined that the time has passed since the registration date and time (= maximum non-update period M) (non-update period ≧ M) (NO in step 4 (S4) in FIG. 3), FIG. In step 5 (S5), the message display unit 12 (see FIG. 2) of the biometric information reader 10 notifies that the biometric information needs to be updated because the non-update period is equal to or longer than the predetermined maximum non-update period. Display a message.

In accordance with this message, when the authentication object person 1 holds the biometric information reading unit 10 over the biometric part where biometric information is read, the biometric information reading unit 11 (see FIG. 2) reads the biometric information of the authentication object person 1 and Data is transmitted to the biometric information registration / change unit 21.
The biometric information authentication device 20 updates and registers the feature points of the received biometric information of the person 1 to be authenticated in the biometric information feature point table 24a of the data storage unit 24, and further acquires the date and time of registration from the system date and time. The registration date is updated and registered in the registration date table 24b.

On the other hand, when it is determined in step 4 (S4) of FIG. 3 that the time has not passed from the registration date and time to the preset period (= maximum non-update period M) (non-update period <M) (FIG. 3). In step 4 (S4) YES), the process proceeds to step 6 (S6) in FIG.
In step 6 (S 6) of FIG. 3, the security release signal output unit 23 (see FIG. 2) of the biometric authentication device 20 outputs a security release signal to the security device 30. The security device 30 that has received the security release signal releases the security. Therefore, for example, since the electric lock (security device 30) of the automatic door d shown in FIG. 1 is unlocked, the person 1 to be authenticated can enter and leave the room.

Note that the biometric information reader 10 illustrated in FIG. 1 may be configured to be implemented as a part of the function of the biometric information authentication device 20.
Further, the biometric information feature point table 24a and the registration date / time table 24b of the data storage unit 24 shown in FIG. 2 are stored in an IC card, and the information is read, registered, and updated via an IC card reader. It may be.

<< Summary >>
The security system S according to the present embodiment is a system that outputs a security release signal of the security device 30. The biometric information reading unit 11 that acquires the biometric information of the person 1 to be authenticated and extracts its feature points, and the read biometric information The biometric information registered in advance is collated with the maximum threshold value, and every time the authentication fails, the threshold value is decreased by a certain value to the minimum threshold value (MIN), and the authentication fails with the minimum threshold value (MIN) ( When the verification is successful (authentication is possible), the elapsed time from the previous biometric information registration date and time is measured, and a preset value (= not maximum) When the elapsed time has reached more than the update period M), a date and time determination unit that displays a message instructing the authentication target person 1 to update and register biometric information on the message display unit 12 22b, a biometric information registration / change unit 21 for registering / updating biometric authentication, a data storage unit 24 for storing biometric information and setting values, and a security device 30 when authentication is successful (authentication is possible) And a security release signal output unit 23 for outputting a security release signal.

<< Action and effect >>
According to the above configuration, by using the control terminal 40 to change thresholds such as the maximum threshold value, the minimum threshold value, and the threshold change width, the “personal rejection rate” at which the authentication target person 1 to be authenticated fails in authentication. Can be reduced.
Furthermore, since the maximum value (maximum threshold value), the minimum value (minimum threshold value), and the threshold value change width can be set, it is possible to set the security level according to the use situation.
In addition, when the pre-set period (= maximum non-update period) from the registration date and time is exceeded, the registered biometric information can be kept up-to-date at all times by allowing the authentication subject 1 to perform update registration. It is possible to obtain a high collation result.

In the embodiment, the configuration in which the control terminal 40 is connected to the biometric information authentication device 20 via the network NW is exemplified. However, the control terminal 40 may be a console terminal device that is directly connected to the biometric information authentication device 20. The connection form of 40 and the biometric information authentication apparatus 20 is not limited.
Moreover, although the biometric information registration / change unit 21, the biometric information collation unit 22a, the date / time determination unit 22b, and the security release signal output unit 23 have been described as being independent from each other, the implementation form is not limited as long as these functions are realized. .

In addition, the biometric information feature point table 24a, the registration date / time table 24b, and the set value table 24c in the data storage unit 24 illustrated in FIG. 2 have been described as tables, but may be configured by an RDB or the like, Needless to say, these forms of implementation are not limited as long as necessary information is stored in a PS file.
Note that the message display unit 12 shown in FIG.
The maximum unupdated period M may be stored in the registration date storage unit of the data storage unit 24. Moreover, it is good also as changeable from the control terminal 40 like a maximum threshold value.
The registration date and time may be information of only the date or information including both the date and time. Alternatively, information including both date and time may be recorded in the registration date and time, and the maximum non-update period may be a unit such as days or years. In this specification, even in the case of only date information, it is expressed as “date and time”.
The biometric information stored in the data storage unit 24 is not limited to the feature points of the biometric information, and may store at least one of the biometric information and the feature points of the biometric information. When the feature points are not stored, the feature points may be extracted from the biometric information by the biometric information matching unit 22a. The biometric information reading unit 11 may transmit the biometric information as it is without extracting the feature points. The biometric information storage unit such as the biometric information feature point table 24a stores biometric information (or feature points of the biometric information or both) of all authentication subjects who are allowed to perform biometric authentication.
Further, in step 5 (S5) of FIG. 3, when the biometric information (or feature point of the biometric information) and the registration date / time are updated and registered by the biometric information registration / change unit 21, the biometric information is read again by the authentication target person 1. In place of performing biometric authentication, the biometric information (or feature point of biometric information) used for determining whether biometric authentication is possible or not is registered as it is in the biometric information matching unit 22a read for biometric authentication immediately before. Good. At this time, the message display unit 12 is notified of a request that the biometric information needs to be updated, and displays a message for confirming whether or not the biometric information read earlier can be used for update registration. 1 may be selected.

DESCRIPTION OF SYMBOLS 1 Authentication object person 10 Biometric information reader 11 Biometric information reader 12 Message display part (display device)
20 Biometric information authentication device (Biometric authentication device, computer)
21 biometric information registration / change unit 22a biometric information matching unit 22b date and time determination unit 23 security release signal output unit 24 data storage unit 24a biometric information feature point table (biological information storage unit)
24b Registration date table (registration date storage unit)
24c Setting value table (setting value storage unit)
30 Security Equipment 40 Control Terminal (Terminal Device)
M Maximum update period

Claims (9)

A biometric authentication device that performs biometric authentication of a person to be authenticated and outputs a security release signal to a security device when biometric authentication is possible,
A data storage unit for storing at least one of the biometric information and biometric information feature points, and the registration date and time, the biometric authentication is possible;
Biometric information collation that compares biometric information feature points acquired from the person to be authenticated with biometric information feature points registered in advance in the data storage unit and determines whether biometric authentication is possible or not based on the similarity And
Compare the biometric information collation date and time by the biometric information collation unit with the biometric information registration date and time stored in the data storage unit, and if the interval is equal to or greater than a preset maximum non-update period, A date and time determination unit that causes the display device to perform a display requesting biometric information update registration;
Update registration of at least one of the biometric information of the person to be authenticated and the feature point of the biometric information received from the biometric information reader according to the update registration request by the date / time determination unit and the registration date / time in the data storage unit A biometric information registration / change unit
A security release signal output unit that outputs a security release signal to the security device when it is determined by the biometric information matching unit that biometric authentication is possible and the interval in the date and time determination unit is less than the maximum unupdated period; A biometric authentication device comprising: The acquired threshold value, minimum threshold value, and threshold value change range are used in advance to check whether or not biometric authentication is possible by comparing the acquired biometric information of the person to be authenticated with the biometric information stored in the data storage unit. Further comprising threshold setting means for setting from the device;
The data storage unit stores the maximum threshold, the minimum threshold, and the threshold change width,
The biometric information matching unit
First, the authentication is performed with the maximum threshold, and each time authentication is rejected, the maximum threshold is lowered by the threshold change width, and the next authentication is performed. The biometric authentication device according to claim 1, wherein display for notifying authentication failure is performed on a display device. The date determination unit
When biometric authentication is possible by the biometric information matching unit, the biometric information verification date and time are compared with the registration date and time of the authentication subject's biometric information stored in the data storage unit. The biometric authentication device according to claim 1 or 2. The data storage unit
A biometric information storage unit that stores at least one of the biometric information and biometric information feature points of all subjects to be authenticated,
A registration date and time storage unit that stores a registration date and time of at least one of the biometric information of all the authentication target persons and the feature points of the biometric information, the biometric authentication being possible;
The biometric authentication device according to claim 1, further comprising: a set value storage unit that stores the maximum unupdated period. A data storage unit that stores at least one of biometric information that can be biometrically authenticated and biometric information feature points, and the date and time of registration, and a security device that performs biometric authentication of a person to be authenticated and can be biometrically authenticated A biometric authentication method using a biometric authentication device that outputs a security release signal to
Whether or not biometric authentication is possible based on the similarity between the biometric information feature point acquired from the authentication subject and the biometric information feature point registered in advance in the data storage unit by the biometric information matching unit And
The date and time determination unit compares the biometric information collation date and time with the biometric information collation unit and the biometric information registration date and time stored in the data storage unit, and when the interval is equal to or greater than a preset maximum non-update period, Display on the display device to request biometric information update registration for the person to be authenticated,
By the biometric information registration / change unit, at least one of the biometric information of the person to be authenticated and the feature point of the biometric information received from the biometric information reader in accordance with the update registration request by the date and time determination unit, and the registration date and time thereof , Update and register in the data storage unit,
When the biometric information collating unit determines that biometric authentication is possible by the security canceling signal output unit and the interval in the date / time determining unit is less than the maximum unupdated period, a security canceling signal is output to the security device A biometric authentication method characterized by: The acquired threshold value, minimum threshold value, and threshold value change range are used in advance to check whether or not biometric authentication is possible by comparing the acquired biometric information of the person to be authenticated with the biometric information stored in the data storage unit. Further comprising threshold setting means for setting from the device;
The data storage unit stores the maximum threshold, the minimum threshold, and the threshold change width,
The biometric information matching unit
First, the authentication is performed with the maximum threshold, and each time authentication is rejected, the maximum threshold is lowered by the threshold change width, and the next authentication is performed. The biometric authentication method according to claim 5, wherein display for notifying authentication failure is performed on a display device. The date determination unit
When biometric authentication is possible by the biometric information matching unit, the biometric information verification date and time are compared with the registration date and time of the authentication subject's biometric information stored in the data storage unit. The biometric authentication method according to claim 5 or 6. The data storage unit
A biometric information storage unit that stores at least one of the biometric information and biometric information feature points of all subjects to be authenticated,
A registration date and time storage unit that stores a registration date and time of at least one of the biometric information of all the authentication target persons and the feature points of the biometric information, the biometric authentication being possible;
The biometric authentication method according to claim 5, further comprising: a set value storage unit that stores the maximum unupdated period.   A program for causing a computer to realize the biometric authentication method according to any one of claims 5 to 8.

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