JP2012165885A - Biometric authentication device, biometric authentication method, and biometric authentication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biometric authentication device, a biometric authentication method, and a biometric authentication program, which reduce deterioration of an authentication rate.SOLUTION: The biometric authentication device 1 collates living body data on authentication acquired when authenticating living body and living body data on registration registered in advance with using authentication thresholds that are ones for authentication so as to authenticate a living body. The biometric authentication device 1 includes an outside air temperature acquisition part 16 to acquire the temperature on authentication that is one when authenticating the living body, a memory part 18 in which authentication thresholds, the living body data on registration, threshold offset value information that is the information on threshold offset values to offset the authentication thresholds are stored, an offset processing part 20 to offset the authentication thresholds based on the threshold offset value information, and a collation part 19 to collate the living body data on authentication and the living body data on registration based on the authentication thresholds after the offset. The threshold offset value information is characterized in that the threshold offset value is set so as to be larger as the temperature on authentication gets lower.

Description

  The present invention relates to a technique such as a biometric authentication device, a biometric authentication method, and a biometric authentication program.

In biometric authentication in which an individual is authenticated using a vein pattern such as a finger or palm, the blood vessels of the living body contract in an environment with a low temperature, and thus the biometric data at the time of registration does not match, and authentication often fails.
In the technique disclosed in Patent Document 1, the temperature of the living body is acquired in addition to the biological data when reading the biological data, and the temperature is compared with the temperature of the living body when registering the biological data. By changing the threshold value for authentication based on the difference between these temperatures, a decrease in the authentication rate is prevented.

JP 2007-11769 A

In the technique disclosed in Patent Document 1, authentication failure is prevented by lowering the threshold value, but there is a problem that the possibility of erroneous authentication of biometric data increases.
Also, in an environment where the temperature is low such as in winter, there is a high possibility that static electricity will be generated when the door knob of the door is touched, and the certifier cannot pass with peace of mind.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the biometric authentication apparatus, biometric authentication method, and biometric authentication program which reduce the fall of an authentication rate.

  In order to solve the above-described problem, the biometric authentication device of the present invention authenticates biometric data at authentication, which is biometric data acquired when authenticating a biometric, and biometric data at registration, which is biometric data registered in advance. A biometric authentication device that performs verification using an authentication threshold that is a threshold for authentication and authenticates a living body, and an outside air temperature acquisition unit that acquires an outside air temperature during authentication, which is a temperature of outside air when authenticating the living body, Based on the threshold correction amount information, a storage unit that stores an authentication threshold, biometric data at the time of registration, and threshold correction amount information that is threshold correction amount information for correcting the authentication threshold. A correction processing unit that corrects the threshold value; and a verification unit that compares the biometric data at the time of authentication and the biometric data at the time of registration based on the authentication threshold value after correction, and the threshold value correction amount information includes The outside air temperature decreases Accordingly, characterized in that it is set so that the threshold value correction amount increases.

  According to the present invention, it is possible to reduce a decrease in authentication rate.

It is a figure which shows the structure of the biometric authentication system which concerns on embodiment. It is a figure which shows the external appearance of the biometrics apparatus which concerns on embodiment. It is a figure which shows an example of the personal information which concerns on embodiment. It is a block diagram which shows the structure of the biometrics apparatus which concerns on embodiment. It is a figure explaining the threshold value correction value which correct | amends the authentication threshold value in embodiment, (a) shows the threshold value correction value when the outside temperature at the time of authentication is low temperature. (B) shows the threshold value correction value when the outside air temperature during authentication is medium. (C) shows a threshold correction value when the outside air temperature during authentication is high. It is a flowchart which shows operation | movement of the biometrics apparatus which concerns on embodiment. It is a figure which shows an example of the accumulation | storage information which concerns on embodiment, (a) shows the main table of accumulation | storage information. (B) is a figure which expands and demonstrates a part of table of (a). (C) shows the table linked | related with the table of (a). It is a flowchart which shows the operation | movement of the accumulation | storage authentication threshold value correction process of the correction process part in the biometrics apparatus which concerns on embodiment. It is a flowchart which shows operation | movement of the biometrics apparatus which concerns on embodiment. It is a figure which shows an example of the screen of the display part of the biometrics apparatus which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
[Configuration of Biometric Authentication System 10]
FIG. 1 is a diagram illustrating a configuration of a biometric authentication system 10 according to the embodiment.
As shown in FIG. 1, the biometric authentication system 10 includes a biometric authentication device 1 connected via a network 4, a system management server 2, and a registration terminal 3.
First, the outline will be described. Information such as biometric data of the certifier is registered in advance by the registration terminal 3 or the biometric authentication device 1 and stored in the database of the system management server 2 or the biometric authentication device 1.
At the time of authentication, the authenticator performs an authentication operation in the biometric authentication device 1, and the biometric data at the time of authentication and the biometric data at the time of registration are collated. If they match, authentication is successful and, for example, the door 5 is unlocked.

The registration terminal 3 registers biometric data, has a function of reading biometric data and biometric temperature for each individual, and also has a function of reading the temperature and humidity of outside air at the same time. Information read by the registration terminal 3 is stored in the database of the system management server 2.
The system management server 2 manages the authentication operation and entry / exit in the biometric authentication device 1, and is configured by a general PC (Personal Computer) or the like. In addition, the system management server 2 registers user information, downloads registered user information, registers an IC (Integrated Circuit) card, manages the biometric authentication device 1, remotely operates the biometric authentication device 1, saves history, and sets a schedule. Etc. have various functions.

Here, the personal information 81 which is information such as biometric data registered in advance will be described.
FIG. 3 is a diagram illustrating an example of the personal information 81 according to the embodiment.
As shown in FIG. 3, the personal information 81 stores a personal name, a personal identification number (PIN), and a personal card number using a personal ID (IDentification) as an index. Furthermore, the personal information 81 includes biometric data at registration, which is data obtained by encrypting biometric data at registration, biometric temperature at registration, which is a biotemperature at registration, authentication threshold at registration, which is an authentication threshold set in advance at the time of registration, The outside air temperature during registration, which is the temperature of the outside air during registration, and the outside air humidity during registration, which is the humidity of the outside air during registration, are stored.

  The authentication threshold indicates the ratio of the degree of coincidence between biometric data at registration that is biometric data at the time of authentication and biometric data at authentication that is biometric data at the time of authentication. For example, as shown in FIG. 3, the registration authentication threshold value “80” indicates that the degree of coincidence between the biometric data at registration and the biometric data at authentication is “80%”. If the degree of coincidence is equal to or higher than the authentication threshold, the authentication is successful. In general, when the value is set large, the possibility of rejecting the person increases, and when the value is set small, the possibility of accepting another person becomes high.

  The personal information 81 is stored in the database of the system management server 2 and is also downloaded and stored in the database of the biometric authentication device 1. The system management server 2 and the biometric authentication device 1 are connected via the network 4, and the personal information 81 stored in each of them is always kept in the same state in synchronization.

[Configuration of Biometric Authentication Device 1]
Next, the configuration of the biometric authentication device 1 will be described with reference to FIGS. 2 and 4.
FIG. 2 is a diagram illustrating an appearance of the biometric authentication device 1 according to the embodiment.
As shown in FIG. 2, the biometric authentication device 1 reads an outside air temperature / humidity sensor 101 that reads outside air temperature / humidity, a display unit 102, a numeric keypad unit 103, a temperature sensor 104 that reads a living body temperature, and biometric data. A biometric data reading scanner 105 and a static electricity removing pad 106 for removing static electricity are provided.

  The authenticator inputs a personal ID or the like using the numeric keypad unit 103 and performs an authentication operation by placing a finger or the like on the biometric data reading scanner 105. The biometric data reading scanner 105 reads the biometric data of the certifier, and the temperature sensor 104 reads the biometric temperature of the certifier. The outside air temperature / humidity sensor 101 reads the outside air (outside air around the biometric authentication device 1) temperature and humidity at the time of authentication. In a predetermined case, a static electricity removal message is displayed on the display unit 102, and the authenticator is prompted by this message and can remove static electricity with the static electricity removal pad 106.

FIG. 4 is a block diagram illustrating a configuration of the biometric authentication device 1 according to the embodiment.
The biometric authentication device 1 is for specifying an individual certifier when the certifier performs an authentication operation.
As shown in FIG. 4, the biometric authentication device 1 reads the card data, the display unit 11 that performs processing for displaying messages of operations and results, the numeric keypad input unit 12 that processes input of personal ID, personal PIN, and the like. Card reader unit 13, biological data acquisition unit 14 that acquires biological data, biological temperature acquisition unit 15 that acquires biological temperature, outside air temperature acquisition unit 16 that acquires outside air temperature, and outside air humidity acquisition that acquires outside air humidity Part 17.

Furthermore, the biometric authentication device 1 includes a storage unit 18 that stores personal information 81, accumulated information 82, threshold correction value information 83, and static electricity detection information 84, a collation unit 19, a correction processing unit 20, a control unit 21, It has.
The personal information 81 is as described above.
The stored information 82 is not registered in advance as the personal information 81 but is stored as data at the time of authentication. The accumulated data is used as an authentication target at the next authentication.
For example, as shown in FIGS. 7A and 7B, the accumulated information 82 includes biometric data at the time of authentication, which is biometric data at the time of authentication, for each personal ID and outside air temperature classification, Authentication threshold values for authentication, which are authentication threshold values, are stored as stored biometric data, stored authentication threshold values, and the like. Details will be described in “Operation of Biometric Authentication Device 1”. Note that the system management server 2 can set the ranges of the low temperature, medium temperature, and high temperature values of the outside air temperature classification. Further, the ranges of the low temperature, medium temperature, and high temperature values may be further subdivided. In particular, the low temperature may be further subdivided because the blood flow deteriorates and the vein pattern changes drastically.

The threshold correction value information 83 is information relating to a threshold correction value (threshold correction amount) for correcting the authentication threshold. The threshold correction value will be described in the following authentication threshold correction method.
(Authentication threshold correction method)
The threshold correction value is for correcting the authentication threshold. For example, when the authentication threshold is “80” and the threshold correction value is “5”, the corrected authentication threshold is “75”. In other words, authentication is facilitated by lowering the ratio of the degree of coincidence between biometric data at the time of registration and biometric data at the time of authentication. In some cases, conversely, the degree of coincidence may be increased to reduce the possibility of accepting others.

FIG. 5A shows a change in the threshold correction value when the outside air temperature during authentication is a low temperature (0 ° C. to 15 ° C.).
The vertical axis is the threshold correction value, and the horizontal axis is the temperature difference between the outside air temperature during authentication, which is the outside air temperature during authentication, and the outside air temperature during registration, which is the outside air temperature during registration. The threshold correction value is set to increase as the temperature difference increases. If the threshold correction value is too large, the possibility of accepting another person increases (shaded area). Therefore, the maximum threshold correction value is set in advance in the system management server 2 so as not to exceed the maximum threshold correction value. .

FIG. 5B and FIG. 5C show changes in threshold correction values when the outside air temperature during authentication is medium temperature (16 ° C. to 30 ° C.) and high temperature (31 ° C. to 40 ° C.), respectively. . If the temperature difference is the same, the threshold correction value is set to increase as the authentication outside air temperature decreases.
Note that the system management server 2 can set the ranges of the low temperature, medium temperature, and high temperature values of the outside air temperature classification. Further, the ranges of the low temperature, medium temperature, and high temperature values may be further subdivided.
In the present specification and the like, the threshold correction amount indicates the degree to which the authentication threshold is corrected, and the threshold correction value is a concept included in the threshold correction amount. In this specification and the like, the threshold correction amount information is information regarding the threshold correction amount, and the threshold correction value information is a concept included in the threshold correction amount information.

Returning to FIG. 4, the description will be continued.
The static electricity detection information 84 is information relating to the range of values of the outside air temperature and the outside air humidity at which static electricity is likely to occur, and is preset by the system management server 2.
The collation unit 19 collates the biometric data during authentication with the biometric data during registration based on the authentication threshold during registration or the corrected authentication threshold obtained by correcting the authentication threshold during registration.
The correction processing unit 20 corrects the authentication threshold with the threshold correction value based on the threshold correction value information 83.
The control unit 21 controls the entire biometric authentication device 1. The control unit 21 determines an operation based on the control information notified from each functional unit described above, and gives instructions to other functional units. In addition, the control unit 21 transmits information stored in the storage unit 18 of the biometric authentication device 1 via a communication unit (not shown), and receives information stored in the server database 201 in the system management server 2.
Note that the information stored in the server database 201 always maintains the same state in synchronization with the information stored in the storage unit 18 of the biometric authentication device 1.

  The biometric authentication device 1 can be realized by a general computer having a CPU (Central Processing Unit) and a memory (not shown). At this time, the biometric authentication device 1 operates according to a biometric authentication program that causes a computer to function as each functional unit described above. Each functional unit described above may be realized by a hardware circuit such as an IC (Integrated Circuit) or an LSI (Large Scale Integration).

[Operation of Biometric Authentication Device 1]
Next, the operation of the biometric authentication device 1 will be described with reference to FIGS. 6 and 7 (the configuration is appropriately shown in FIG. 4).

As shown in the flowchart of FIG. 6, in step S11, the numeric keypad input unit 12 acquires a personal ID.
In step S12, the biometric data acquisition unit 14 acquires biometric data at the time of authentication. Moreover, the biological temperature acquisition part 15 acquires the biological temperature at the time of authentication. Moreover, the outside temperature acquisition part 16 acquires the outside temperature at the time of authentication. Moreover, the outside air humidity acquisition part 17 acquires the outside air humidity at the time of authentication.
In step S <b> 13, the control unit 21 refers to the accumulation information 82 and determines whether or not N or more pieces of accumulated biometric data are accumulated in the outside air temperature category to which the outside air temperature at the time of authentication belongs.
That is, in the initial state where the number of times of authentication is small, the processing of step S14 to step S20 (step S13, No) is executed, and in the state where the number of times of authentication exceeds a certain value, step S21 to step S29 (step S13, Yes). Execute the process.

  For example, as shown in FIG. 7A and FIG. 7B, N pieces of stored biometric data are stored in the data with the personal ID “0001” and the outside air temperature classification being low (0 ° C. to 15 ° C.). ing. Each of these is stored in the storage information 82 when the authentication is successful, and the authentication has been successful N times in the past. N can be set in advance by the system management server 2, and is set to 10, for example. Further, when the number of successful authentications exceeds N times, the stored biometric data having the highest accumulated threshold correction value or the smallest number of matches is deleted from the stored biometric data, and the (N + 1) th time is deleted. The stored biometric data may be stored.

When it is determined that N or more pieces of accumulated biometric data are not accumulated (step S13 / No), in step S14, the collation unit 19 performs authentication biometric data, registration biometric data, and registration biometric data based on the registration authentication threshold. Is matched.
In the following flow, description will be made assuming that L = 2, M = 4, P = 2, and Q = 4.
In step S15, the collation unit 19 determines whether or not the authentication is successful.
When the authentication is successful (step S15 / Yes), in step S20, the control unit 21 determines the biometric data at the time of authentication, the authentication threshold value at the time of authentication, the biometric temperature at the time of authentication, and the threshold value for each outside air temperature category to which the authentication outside air temperature belongs The correction value is stored in the accumulated information 82.

  For example, as shown in FIGS. 7A and 7B, in the accumulated information 82, the biometric data at the time of authentication is stored as biometric data and the authentication threshold value at the time of authentication is set for each outside air temperature category to which the outside air temperature at authentication belongs. As the accumulated authentication threshold, the threshold correction value is stored as the accumulated threshold correction value, and as shown in FIG. 7C, the biometric temperature during authentication is stored as the accumulated biometric temperature.

On the other hand, if the authentication has failed (No at Step S15), and L = 2 and M = 4 when the authentication is the first time, the process proceeds to Step S18 (Step S16, No → Step S17, No), the control unit 21 causes the display unit 11 to display that the user is prompted to perform the authentication operation again, and the biometric data acquisition unit 14 newly acquires biometric data at the time of authentication again (step S18). And a process returns to step S14 and the collation part 19 collates newly acquired biometric data at the time of authentication and biometric data at the time of registration based on the authentication threshold value at the time of registration.
Note that L or M can be set by the system management server 2.

  If the authentication has failed (No at Step S15), and the authentication is the second time, the process proceeds to Step S19 (Yes at Step S16), and the correction processing unit 20 corrects the registration authentication threshold (Authentication Threshold Correction Method). See). In step S18, the control unit 21 causes the display unit 11 to display a message prompting the user to perform an authentication operation again, and the biometric data acquisition unit 14 newly acquires biometric data at the time of authentication (step S18). Then, the process returns to step S14, and the collation unit 19 collates the newly acquired authentication biometric data with the registration biometric data based on the corrected authentication threshold obtained by correcting the registration authentication threshold.

  If the authentication has failed (step S15 / No), and the authentication is the third time, the process proceeds to step S18 (step S16 / No → step S17 / No), and the control unit 21 again displays on the display unit 11. The display prompting the user to perform an authentication operation is displayed, and the biometric data acquisition unit 14 newly acquires biometric data at the time of authentication again (step S18). And a process returns to step S14 and the collation part 19 collates newly acquired biometric data at the time of authentication, and biometric data at the time of registration based on the authentication threshold value after correction | amendment.

  If the authentication fails (step S15 / No) and the authentication is the fourth time, the process ends (step S16 / No → step S17 / Yes).

If it is determined in step S13 that N or more pieces of accumulated biometric data have been accumulated (step S13 / Yes), in step S21, the control unit 21 has the highest number of matches among the N pieces of accumulated biometric data. A large amount of accumulated biometric data is used as verification target data.
In step S22, the collation unit 19 collates the data to be collated with the biometric data at the time of authentication based on the corresponding accumulated authentication threshold value.

  For example, as shown in FIG. 7B, in the N records, if the accumulated biometric data “AA3” is the largest in the number of matches “5”, the collation unit 19 determines that the authentication biometric data and the accumulated biometric data “ AA3 ”is checked using the stored authentication threshold“ 74 ”.

In step S23, the collation unit 19 determines whether or not the authentication is successful.
When the authentication is successful (step S23 / Yes), in step S29, the control unit 21 increases the number of matches of the stored biometric data, and stores the biometric temperature during authentication as the stored biometric temperature for each stored biometric data. Stored in information 82.

  For example, as shown in the left diagrams of FIG. 7B and FIG. 7C, the number of matches, which is the number of times of successful authentication, is stored in the table attached to the stored information 82 associated with the stored biometric data “AA3”. The accumulated living body temperature for the batch is stored. As shown in the right figure of FIG. 7C, the accumulated biometric data “AA2” stores the accumulated biometric temperature corresponding to the number of coincidence three times.

On the other hand, if the authentication fails (No at Step S23), and P = 2 and Q = 4 when the authentication is the first time, the process proceeds to Step S26 (Step S24 No → Step S25 No), the control unit 21 causes the display unit 11 to display that the user is prompted to perform the authentication operation again, and the biometric data acquisition unit 14 newly acquires biometric data at the time of authentication again (step S26). Then, the process returns to step S21.
P or Q can be set by the system management server 2.

If the authentication has failed (No at Step S23), and the authentication is the second time, the process proceeds to Step S27 (Yes at Step S24), and the correction processing unit 20 performs a storage authentication threshold value correction process. Details of this processing will be described later.
Subsequently, in step S26, the control unit 21 causes the display unit 11 to display a message prompting the user to perform an authentication operation again, and the biometric data acquisition unit 14 newly acquires biometric data at the time of authentication (step S26). ). Then, the process returns to step S21, and the control unit 21 sets the stored biometric data having the largest number of matches among the N stored biometric data as the comparison target data.
In step S22, the collation unit 19 collates the collation target data with the newly acquired biometric data at the time of authentication based on the corrected authentication threshold value obtained by correcting the corresponding accumulated authentication threshold value.

If the authentication fails (step S23 / No) and the authentication is the third time, the process proceeds to step S26 (step S24 / No → step S25 / No), and the control unit 21 again displays on the display unit 11. The display prompting the user to perform an authentication operation is displayed, and the biometric data acquisition unit 14 newly acquires biometric data at the time of authentication again. Then, the process returns to step S21, and the control unit 21 sets the stored biometric data having the largest number of matches among the N stored biometric data as the comparison target data.
In step S22, the collation unit 19 collates the collation target data with the newly acquired biometric data at the time of authentication based on the corrected authentication threshold value.

  If the authentication has failed (step S23 / No) and the authentication has been performed for the fourth time, the process proceeds to step S28 (step S24 / No → step S25 / Yes), and the control unit 21 stores the N accumulated biometrics. Among the data, the accumulated biometric data having the second highest number of matches is set as the verification target data (step S28). And a process returns to step S22 and the collation part 19 collates biometric data at the time of authentication, and collation object data based on a corresponding accumulation | storage authentication threshold value.

For example, as shown in FIG. 7B, in the N records, if the stored biometric data “AA2” is the second most frequent match number “3”, the collation unit 19 performs the authentication biometric data and the stored biometric data. The data “AA2” is collated using the storage authentication threshold “78”.
In addition, what is necessary is just to complete | finish the loop of step S21-step S28 by predetermined times.

(Accumulation authentication threshold correction process)
Next, the accumulation authentication threshold value correction process in step S27 will be described with reference to FIGS.
As shown in the flowchart of FIG. 8, in step S <b> 271, the correction processing unit 20 acquires the accumulated biological temperature corresponding to the number of times of the accumulated biological data that is the verification target data. For example, as shown in FIG. 7B, since the number of matches of the accumulated biometric data “AA3” as the verification target data is “5”, as shown in the left diagram of FIG. 5 stores stored living body temperatures, and acquires all of these stored living body temperatures.

In step S272, the correction processing unit 20 calculates an average value of the acquired plurality of accumulated living body temperatures. For example, as shown in the left diagram of FIG. 7C, the average value of these accumulated living body temperatures is “32.4”.
In step S273, the correction processing unit 20 acquires the biometric temperature during authentication.
In step S274, the correction processing unit 20 calculates the difference between the calculated average value and the biometric temperature during authentication. For example, if the biometric temperature at the time of authentication is “30”, the difference is “−2.4”.

  In step S275, the correction processing unit 20 corrects the threshold correction value using the calculated difference. For example, as shown in FIG. 7B, “Δx” is added to the accumulation threshold correction value “6” of the accumulated biometric data “AA3”. “Δx” is a variable depending on the difference, and may be set as appropriate. Conversely, when the difference is “+2.4”, “Δx” may be subtracted from the accumulation threshold correction value “6” in order to reduce the possibility of accepting others.

  In step S276, the correction processing unit 20 corrects the registration-time authentication threshold value with the corrected threshold correction value to obtain the accumulated authentication threshold value. For example, as illustrated in FIG. 7B, the corrected threshold correction value “6 + Δx” is subtracted from the registration-time authentication threshold “80” to obtain the accumulated authentication threshold “74−Δx”. The correction may be performed by directly subtracting “Δx” from the accumulation authentication threshold value “74”.

(Static elimination display processing)
Next, the static electricity removal display process will be described with reference to FIGS.
This process is executed periodically. For example, the cycle is 5 minutes.
As shown in the flowchart of FIG. 9, in step S41, the outside air temperature acquisition unit 16 acquires the outside air temperature. Moreover, the outside air humidity acquisition part 17 acquires outside air humidity.
In step S <b> 42, the control unit 21 determines whether or not the acquired outside air temperature and outside air humidity are within the range of the outside air temperature and outside air humidity values set in the static electricity detection information 84 at which static electricity is likely to occur.

If within the range (step S42 / within range), in step S43, the display unit 11 displays a static electricity removal message. For example, as shown in FIG. 10, the static electricity removal message is “There is a possibility that static electricity may be generated. Please enter the room after touching the static electricity removal pad”.
On the other hand, if it is out of range (step S42, out of range), in step S44, the display unit 11 hides the static electricity removal message.

According to the present embodiment, every time authentication is successful, biometric data that has been successfully authenticated and an authentication threshold are accumulated, so that the biometric data becomes stable and the authentication rate is stable.
Further, in an environment where static electricity is likely to be generated when the door knob of the door is touched, a message is displayed on the display unit 102 of the biometric authentication device 1 to prompt the removal of static electricity in advance, so that the authenticator can pass with peace of mind. it can.

<Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, For example, it can change as follows in the range which does not deviate from the meaning of this invention.
The horizontal axis of the graphs of FIGS. 5A to 5C may be a temperature difference between the biometric temperature during authentication and the biometric temperature during registration. That is, the threshold correction value information may be set such that the threshold correction value increases as the difference between the authentication biometric temperature and the registration biometric temperature increases.
Further, the threshold correction amount information is set to a small threshold correction amount when the biometric temperature at the time of authentication is higher than the biometric temperature at the time of registration. It is good also as setting large.

  Moreover, it is good also considering the horizontal axis of the graph of Fig.5 (a)-(c) as a temperature difference of the external temperature at the time of authentication, and the biological temperature at the time of authentication. The case where the temperature difference is large is, for example, a case where the person suddenly enters the room from the outside where the temperature is low. At this time, a message prompting to warm the hand may be displayed.

Moreover, in step S18 or step S26 of the flowchart shown in FIG. 6, the biological temperature acquisition unit 15 may acquire the authentication biological temperature again.
In addition, the processes in steps S18 and S26 in the flowchart shown in FIG. 6 may be omitted after the processes in steps S19 and S27 are executed.
Further, according to the flowchart shown in FIG. 6, the authentication threshold is not corrected in the processing between the authentication L-th and M-th times and the authentication P-th and Q-th times, but the authentication threshold is corrected. It is good.

  In the embodiment of the present invention, the steps of the flowchart show an example of processing that is performed in time series in the order described. However, even if they are not necessarily processed in time series, they are executed in parallel or individually. The processing to be performed is also included.

  In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Biometric authentication apparatus 2 System management server 3 Registration terminal 4 Network 5 Door 10 Biometric authentication system 11 Display part 12 Numeric keypad input part 13 Card reader part 14 Biometric data acquisition part 15 Biometric temperature acquisition part 16 Outside air temperature acquisition part 17 Outside air humidity acquisition part DESCRIPTION OF SYMBOLS 18 Memory | storage part 19 Collation part 20 Correction process part 21 Control part 81 Personal information 82 Accumulated information 83 Threshold correction value information (threshold correction amount information)
84 Electrostatic detection information 101 Outside temperature / humidity sensor 102 Display unit 103 Numeric keypad 104 Temperature sensor 105 Biological data reading scanner 106 Static electricity removal pad 201 Server database

Claims (10)

The biometric data at the time of authentication, which is biometric data acquired when the biometric is authenticated, and the biometric data at the time of registration, which is biometric data registered in advance, are collated using an authentication threshold that is a threshold for authentication. A biometric authentication device for authentication,
An outside air temperature acquisition unit that acquires an outside air temperature at the time of authentication, which is the temperature of the outside air when authenticating the living body,
A storage unit for storing the authentication threshold, the biometric data at the time of registration, and threshold correction amount information that is information of a threshold correction amount for correcting the authentication threshold;
A correction processing unit that corrects the authentication threshold based on the threshold correction amount information;
A verification unit for verifying the biometric data at the time of authentication and the biometric data at the time of registration based on the corrected authentication threshold;
The biometric authentication device, wherein the threshold correction amount information is set such that the threshold correction amount increases as the outside air temperature during authentication decreases. The storage unit further stores an outside air temperature during registration, which is a temperature of the outside air when registering biometric data,
The living body according to claim 1, wherein the threshold correction amount information is set such that the threshold correction amount increases as a difference between the authentication outside air temperature and the registration outside air temperature increases. Authentication device. A living body temperature acquisition unit that acquires a living body temperature at the time of authentication, which is the temperature of the living body when authenticating the living body;
The storage unit further stores a biometric temperature at the time of registration, which is a temperature of a living body when registering biometric data,
The living body according to claim 1, wherein the threshold correction amount information is set such that the threshold correction amount increases as a difference between the authentication living body temperature and the registration living body temperature increases. Authentication device. The threshold correction amount information is set to a small threshold correction amount when the biometric temperature at the time of authentication is higher than the biometric temperature at the time of registration. The biometric authentication device according to claim 3, wherein the biometric authentication device is set. The storage unit further stores the authentication biometric data at the time of successful authentication and an authentication authentication threshold that is an authentication threshold at the time of authentication as accumulated biometric data and accumulated authentication threshold, respectively.
The biometric authentication device according to any one of claims 1 to 4, wherein the collation unit collates the biometric data during authentication and the accumulated biometric data based on the accumulated authentication threshold. The storage unit further stores the threshold correction amount when authentication is successful and the biometric temperature during authentication, which is the temperature of the living body at the time of authentication, for each accumulated biometric data as an accumulation threshold correction amount and an accumulated biotemperature, respectively. And
The correction processing unit corrects the corresponding accumulation authentication threshold based on the biometric temperature during authentication and the accumulated biometric temperature,
The biometric authentication device according to claim 5, wherein the collation unit collates the biometric data at the time of authentication with the accumulated biometric data based on a corrected accumulated authentication threshold value. The storage unit further stores, for each stored biometric data, the number of successful authentications as the number of matches, for each stored biometric data at the time of the authentication,
The collation unit uses the accumulated biometric data as collation target data in descending order of the number of matches, and collates the biometric data during authentication and the collation target data based on a corresponding accumulation authentication threshold. The biometric authentication device according to claim 5 or 6. It further comprises an outside air humidity acquisition unit that acquires outside air humidity during authentication, which is the humidity of outside air when authenticating a living body,
The storage unit further stores static electricity detection information that is information on the outside air temperature and outside air humidity for detecting static electricity,
The control unit displays a static electricity removal message on a display unit when the authentication outside air temperature and the authentication outside air humidity are within a predetermined range based on the static electricity detection information. The biometric authentication device according to any one of claims 1 to 7. The biometric data at the time of authentication, which is biometric data acquired when the biometric is authenticated, and the biometric data at the time of registration, which is biometric data registered in advance, are collated using an authentication threshold that is a threshold for authentication. A biometric authentication method in a biometric authentication device for authentication,
The control unit of the biometric authentication device
Obtain the outside air temperature at the time of authentication, which is the temperature of the outside air when authenticating the living body,
Storing the authentication threshold, the biometric data at the time of registration, and threshold correction amount information which is information of a threshold correction amount for correcting the authentication threshold;
Correcting the authentication threshold based on the threshold correction amount information;
Based on the corrected authentication threshold, the authentication biometric data and the registration biometric data are collated,
The biometric authentication method is characterized in that the correction is performed based on threshold correction amount information set so that the threshold correction amount increases as the authentication outside air temperature decreases.   A biometric authentication program for causing a computer to execute the biometric authentication method according to claim 9.

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