JP2009104379A - Biological information authentication device and method for registering biological information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for reducing false rejection rate in biometrics. <P>SOLUTION: This biological information authentication device 1000 acquires biological information for temporal registration in registering the biological information of a user (step S100), and executes temporal registration confirmation processing for confirming whether or not the user may be authenticated based on the temporarily registered biological information, and concretely, calculates the matching degree between the temporarily registered data and reject data, and displays the matching degree in a matching degree indicator display part 123, to notify a user thereof(steps S150, 170). A user confirms the matching degree, and instructs a biological information authentication device 1000 whether to formally register the information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a biometric information authentication apparatus that authenticates biometric information.

  In the biometric authentication, an individual is usually authenticated using individual pattern information (biometric information) such as a fingerprint, finger vein, and retina. Specifically, biometric information registered in advance and biometric information acquired at the time of authentication are collated, and if the degree of matching (matching rate) between both is a predetermined value or more, the person is authenticated. That is, authentication is performed when the registered biometric information is reproduced within a predetermined approximate range by the biometric information acquisition process at the time of authentication.

  Therefore, for example, when a finger vein pattern is used for authentication, the placement position and the placement angle of a finger that is an imaging target are significantly different at the time of registration and authentication with respect to an image sensor for acquiring finger vein information. If they are different, even the principal may not be authenticated. Up to now, various techniques have been proposed for reproducing acquired biometric information as information approximated to registered biometric information when authenticating a registrant.

JP2007-122368

  However, until now, when registering biometric information, the registrant (user) has not been able to confirm whether or not the biometric information to be registered is sufficiently reproducible. Therefore, there is a problem that biometric information with a low possibility of reproduction (reproducibility) is registered, and the identity rejection rate at the time of authentication increases. Until now, it has been the actual situation that such a problem has not been sufficiently devised.

  An object of the present invention is to provide a technique for reducing the identity rejection rate in biometric authentication.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

Application Example 1 A biometric information authentication apparatus for authenticating biometric information, including a biometric information storage unit that stores first biometric information that is registered as a reference for authentication, and second biometric information that is an authentication target A biometric information acquisition unit to acquire; an authentication execution unit that executes an authentication process for obtaining a degree of matching between the first and second biometric information; and an authentication result notification unit that notifies the user of the authentication result of the authentication execution unit. A biometric information authentication apparatus, wherein the authentication execution unit calculates a degree of matching of the second biometric information with respect to the first biometric information, and the authentication result notification unit notifies the user of the degree of matching .

  According to this biometric information authentication device, since the user can know the degree of consistency calculated by the biometric information authentication process, the user can confirm the reproducibility of the registered first biometric information. Therefore, when the reproducibility of the first biometric information is low, the user can take measures such as re-registering the first biometric information, and the reproducibility of the first biometric information is low. An increase in the rejection rate can be suppressed.

[Application Example 2] The biometric information authentication device according to Application Example 1, wherein the authentication execution unit repeatedly calculates the degree of matching while the living body is placed on the biometric information acquisition unit, and the authentication The result notification unit notifies the user of the degree of matching every time the degree of matching is calculated.

  According to this biometric information authentication device, even when the user places a living body on the biometric information acquisition unit, even if the placement position of the living body is changed, the authentication result notifying unit does not change the degree of matching according to the change. Is repeatedly notified to the user. Thereby, the user can know the degree of matching according to the arrangement position of the living body on the biological information acquisition unit in real time, and can know the arrangement position of the living body where the reproducibility of the first biological information is improved. That is, since the user can grasp the arrangement position of the living body suitable for authentication, the identity rejection rate at the time of authentication can be reduced.

[Application Example 3] The biometric information authentication device according to Application Example 1 or Application Example 2, wherein the authentication result notification unit notifies the user of the range of the degree of matching calculated over a plurality of times. Biometric information authentication device.

  According to this biometric information authentication apparatus, since the user can know the range in which the degree of matching has fluctuated, it can be used as a standard for determining whether the reproducibility of the first biometric information is high or low. Therefore, the possibility that the first biometric information with low reproducibility is registered can be reduced, and the identity rejection rate at the time of authentication can be reduced.

[Application Example 4] The biometric information authentication device according to any one of Application Examples 1 to 3, further including a registration execution unit that executes update registration of the first biometric information. The biometric information includes regular registered biometric information that has been properly registered and temporary registration biometric information that has not been properly registered, and the pre-authentication execution unit includes the provisional registration biometric information and the second biometric information. In addition to calculating the degree of consistency, the authentication result notifying unit notifies the user of the degree of consistency, and the registration executing unit uses the provisional registration biometric information as the regular registration biometric information in accordance with an instruction from the user. A biometric information authentication apparatus that executes update registration or discards the temporary registration biometric information without registering it normally.

  According to this biometric information authentication apparatus, the user can register the temporary registration biometric information properly after confirming the reproducibility of the temporary registration biometric information based on the notified degree of matching. Therefore, it is possible to suppress an increase in the rejection rate by registering biometric information with low reproducibility.

[Application Example 5] The biometric information authentication device according to any one of Application Examples 1 to 4, wherein the authentication result notification unit has the matching degree only when the matching degree is greater than a predetermined value. A biometric information authentication device that executes notification.

  According to this biometric information authenticating apparatus, even if a third party other than the registrant who cannot be authenticated normally collates his / her biometric information against the registrant's biometric information, the verification is performed. The degree is not displayed. Therefore, it is possible to prevent a third party from using the matching degree maliciously.

[Application Example 6] The biometric information authentication device according to any one of Application Examples 1 to 5, wherein the authentication result notification unit is configured to improve the degree of matching according to the value of the degree of matching. A biometric information authentication apparatus that notifies the user of guidance related to the second biometric information acquisition method.

  According to this biometric information authentication device, it is possible to teach appropriate guidance for improving the authentication accuracy to the user. Accordingly, it is possible to reduce the user rejection rate at the time of authentication.

  The present invention can be realized in various forms, for example, a biometric information authentication method and a biometric information authentication device, a control method of a biometric information authentication device, a control device of a biometric information authentication device, those methods or The present invention can be realized in the form of a computer program for realizing the functions of the apparatus, a recording medium on which the computer program is recorded, and the like.

Next, embodiments of the present invention will be described in the following order based on examples.
A. First embodiment:
B. Second embodiment:
C. Third embodiment:
D. Fourth embodiment:
E. Variations:

A. First embodiment:
FIG. 1 is a block diagram showing a configuration of a biometric information authentication apparatus as an embodiment of the present invention. The biometric information authentication apparatus 1000 acquires and registers a feature quantity of a user (user) finger vein pattern as biometric information and uses it for authentication. The biometric information authentication apparatus 1000 includes a user interface unit 100, a control unit 200, a feature amount extraction unit 300, a temporary registration data storage unit 400, an authentication processing unit 500, and a regular registration data storage unit 600. .

  The user interface unit 100 mediates exchange of information between the user and the biometric information authentication apparatus 1000 when the user uses the biometric information authentication apparatus 1000. The user interface unit 100 includes a finger vein information input unit 110 and a touch panel 120.

  The finger vein information input unit 110 is an imaging element (detection element) for biological information that can transmit near infrared light to a user's finger and acquire image data of the vein pattern of the finger. The user places a finger to be detected on the detection element of the finger vein information input unit 110 and reads his / her finger vein information.

  The touch panel 120 functions as a display unit that displays a message for the user on the display screen. In addition, the touch panel 120 functions as an operation unit that receives an instruction from the user by detecting that the user has touched a touch button displayed on the display screen of the touch panel 120.

  The control unit 200 is configured as a logic circuit centered on a microcomputer. The control unit 200 controls transmission / reception of data between the components of the biometric information authentication apparatus 1000, and issues an execution command to each component described below when executing various processes including biometric information registration / authentication. To do.

  The feature amount extraction unit 300 receives the image data of the finger vein pattern acquired by the finger vein information input unit 110 via the control unit 200, and calculates the feature amount of the finger vein pattern. The calculated feature amount data is transmitted via the control unit 200 to either the authentication processing unit 500 or the provisional registration data storage unit 400 according to the process executed by the control unit 200. In this specification, the feature amount data calculated from the finger vein pattern is also referred to as “finger vein information”.

  The temporary registration data storage unit 400 includes a volatile storage device, and is calculated by the feature amount extraction unit 300 during a new biometric information registration process (described later) and an update registration process (described in the second embodiment). The obtained feature data is temporarily stored as temporary registration data. The regular registration data storage unit 600 is configured by a non-volatile storage device, and continuously stores temporary registration data that has received an instruction for regular registration from a user in a registration confirmation process described later as regular registration data. The regular registration data storage unit 600 may be an IC card that is carried by the user and used for authentication.

  The authentication processing unit 500 collates the feature amount data of the two finger vein patterns, and calculates a matching degree indicating the matching degree. More specifically, at the time of executing the user authentication process, the authentication processing unit 500 receives the feature value data of the finger vein pattern acquired by the finger vein information input unit 110 from the feature value extraction unit 300 via the control unit 200. (This feature data is hereinafter referred to as “authenticated data”). Further, the authentication processing unit 500 receives the regular registration data registered in the regular registration data storage unit 600 via the control unit 200. The authentication processing unit 500 collates the two feature amount data to calculate a matching degree. Note that the authentication processing unit 500 calculates a matching degree between the temporary registration data stored in the temporary registration data storage unit 400 and the data to be authenticated in a registration confirmation process described later.

  The control unit 200 determines that the user is the user when the collation degree calculated by the authentication processing unit 500 when executing the user authentication processing is within a predetermined value range (for example, 80% to 100%) ( Certify. This range of verification degrees that can be authenticated is referred to as “authenticable range”. Usually, the feature amount data differs depending on the change in the acquisition state between the registration and the authentication. Here, the “change in acquisition status” includes, for example, a change in the arrangement state of the user's finger with respect to the detection element of the finger vein information input unit 110.

  2A to 2C are schematic views showing a state where the user's finger YF is arranged on the detection element 111 of the finger vein information input unit 110. FIG. In FIG. 2A, the user's finger YF is arranged substantially parallel to the side 111s of the detection element 111. In FIG. 2B, the user's finger YF is disposed with an angle in the direction of the arrow in the figure with respect to the side 111s of the detection element 111. In FIG. 2C, the user's finger YF is arranged at an angle along the circumferential direction of the abdomen, as indicated by the arrow in the figure.

  As described above, the arrangement position of the user's finger YF with respect to the detection element 111 can be freely changed according to the user's will, and therefore, there may be a difference in the acquired finger vein information between the registration time and the authentication time. The difference may also occur due to other factors such as an error in the acquired information. Therefore, not only finger vein authentication but also biometric authentication, the above authentication range is set so that the difference can be allowed, and the possibility of not being authenticated even by the person (person rejection rate) is suppressed from increasing. To do.

  However, the registered finger vein information is reproduced when the finger vein information is acquired at the time of authentication, as in the case where the finger placement at the time of registration is extremely peculiar and the position of the finger is not likely to be reproduced at the time of authentication. If the data is unlikely to be possible, the rejection rate will still be high. That is, by suppressing the registration of biometric information with low reproducibility and poor quality, the authentication accuracy of biometric authentication can be improved. Therefore, in this embodiment, a new registration process described below is executed when registering a user.

  FIG. 3 is a flowchart showing a procedure of a new user registration process executed by the control unit 200 in the biometric information authentication apparatus 1000. By this new registration process, the user can register his / her finger vein information in the regular registration data storage unit 600 (FIG. 1) of the biometric information authentication apparatus 1000.

  First, the control unit 200 acquires finger vein information for temporary registration of a user n times (n is an arbitrary positive number). Specifically, the control unit 200 causes the touch panel 120 to display a message indicating that the finger is placed on the detection element, and the finger vein information input unit 110 detects the placement of the finger on the detection element by the user. Sometimes image data of a finger vein pattern is acquired (step S100). Subsequently, the control unit 200 causes the feature amount extraction unit 300 to calculate feature amount data from the image data of the finger vein pattern acquired in step S100, and stores the feature amount data in the temporary registration data storage unit 400 ( Step S110). The control unit 200 repeats this operation n times (step S120). In other words, the temporary registration data storage unit 400 stores n feature amount data for the user. These n pieces of feature data are referred to as “temporary registration candidate data”.

  Next, the control unit 200 selects data optimal for authentication processing from the temporary registration candidate data (step S130). Specifically, the feature amount data closest to the average value of n feature amount data may be selected as the optimum data. In addition, as a method for selecting optimum data, a median value may be selected from n pieces of feature amount data, or a correlation between each feature amount data may be obtained and used. The control unit 200 deletes (discards) other temporary registration candidate data that has not been selected. The temporary registration candidate data selected in this step is referred to as “temporary registration data”, and the series of processes so far are particularly referred to as “temporary registration process”.

  The control unit 200 executes a registration confirmation process following the temporary registration process. Here, the “registration confirmation process” is a process for confirming whether or not the user can actually be authenticated by the feature amount data of the temporarily registered finger vein pattern. By executing this registration confirmation process, it is possible to ensure the quality of the feature amount data that is normally registered.

  FIG. 4A shows an example of a display screen displayed on the touch panel 120 (FIG. 1) in the registration confirmation process. The display screen 121 displays a message display unit 122 that displays a message for the user, a matching degree indicator display unit 123, and two touch buttons 124 and 125 for receiving a user operation.

  FIG. 4B is an explanatory diagram showing the display of the matching level indicator display unit 123, and only the matching level indicator display unit 123 in the display screen 121 is illustrated. The collation degree indicator display unit 123 displays a bar graph bg extending according to the collation degree calculated when the authentication processing unit 500 performs the authentication process. In addition, the bar graph bg of the collation degree indicator display part 123 can display the collation degree of an authenticable range (80%-100%).

  The message display unit 122 displays an instruction to the user to place the finger used to acquire the temporary registration data on the detection element 111 (FIG. 2) of the finger vein information input unit 110 again. The control unit 200 causes the finger vein information input unit 110 to acquire a finger vein pattern, and causes the feature amount extraction unit 300 to calculate the feature amount data, as in step S100 of the temporary registration process (FIG. 2; step S140). .

  Next, the control unit 200 transmits the feature amount data (data to be authenticated) calculated in step S140 to the authentication processing unit 500 together with the temporary registration data stored in the temporary registration data storage unit 400. The authentication processing unit 500 collates the two transmitted data and calculates a collation degree (step S150).

  When the matching level is within the authenticable range, the control unit 200 displays a bar graph bg indicating the matching level on the matching level indicator display unit 123 (steps S160 and S170). The user can determine whether or not to temporarily register the provisional registration data after referring to the display result of the collation degree indicator display unit 123. Specifically, an instruction for regular registration can be given by pressing the formal registration touch button 124 on the display screen 121 (step S180). The control unit 200 stores the temporary registration data in the regular registration data storage unit 600 according to the instruction from the user, and deletes the temporary registration data from the temporary registration data storage unit 400 (step S190).

  If the user does not press the official registration touch button 124 after the collation degree indicator display unit 123 is displayed, the control unit 200 considers that the user has instructed reconfirmation, and repeats the processing from step S140 again. Further, in step S160, even if the matching degree is not within the authenticable range, in principle, the processing from step S140 is repeated in the same manner. That is, until the formal registration instruction is given by the user's formal registration touch button 124, the processing of steps S140 to S180 is repeated at a predetermined interval. The processing from step S140 to step S180 is particularly referred to as “temporary registration confirmation processing”.

  While the temporary registration confirmation process is repeated, the user can freely change the finger placement as shown in FIGS. 2A to 2C, and the collation degree indicator display unit 123 displays the finger placement position. Continuously fluctuates according to the fluctuation of Accordingly, the user can visually recognize the reproducibility of the current temporary registration data from the fluctuation range of the matching degree by displaying the matching degree indicator display unit 123 during the temporary registration confirmation process. Since the verification degree tends to vary with the degree of authentication, it is preferable that a value larger than the lower limit of the authenticable range (for example, a value equal to or higher than the intermediate value of the authenticable range) is obtained on average. That is, in this temporary registration confirmation process, if the matching degree fluctuates around a high average value (for example, fluctuates within a range of 90% ± 5%), it is determined that the temporary registration data has high reproducibility. it can. On the contrary, if the collation degree fluctuates around a low average value (for example, fluctuates in a range of 85% ± 5%), it can be determined that the temporarily registered data has low reproducibility.

  Here, it is assumed that formal registration is performed after confirming that the temporary registration data can be authenticated without displaying the verification level on the verification level indicator display unit 123. In this case, for example, it is assumed that authentication by temporary registration data is successful near the lower limit of the authenticable range where the matching degree is about 80% to 85%. Then, since the user cannot know the value of the collation degree, the temporary registration data with low reproducibility is regularly registered, and the authenticity rejection rate may increase at the time of authentication on another day.

  On the other hand, according to the configuration of the present embodiment, the matching degree indicator display unit 123 displays the matching degree to the user. Therefore, it is possible to reduce the possibility that the low-quality feature amount data that can obtain only the collation degree near the lower limit of the authenticable range on average can be registered normally. Further, the user can know the placement position of the finger on the detection element 111 where the matching degree is high by the display of the matching degree indicator display unit 123. That is, it is possible to grasp the finger placement position suitable for authentication, and the possibility that the person is rejected because the finger placement position is different can be reduced.

  If the user determines that it is preferable to re-acquire temporary registration data as a result of referring to the display on the collation degree indicator display unit 123, the user presses the registration data re-acquisition touch button 125 on the touch panel 120 to display the control unit. 200 can be instructed to discard the provisional registration data (steps S160, S180, S195). In this case, the control unit 200 deletes the temporary registration data in the temporary registration data storage unit 400 and executes the temporary registration process again.

  Further, when the matching level is very low (for example, 50% or less) in step S160, or a matching level that can be authenticated is not obtained for a predetermined time (for example, about 3 minutes), the bar graph bg of the matching level indicator display unit 123 is displayed. Even when there is not, the control unit 200 may discard the temporary registration data and execute the temporary registration process again. In this case, the control unit 200 may confirm to the user via the touch panel 120 that the temporary registration data is to be discarded.

  As described above, according to the configuration of the present embodiment, it is possible to ensure that highly reproducible biometric information is registered, reduce the person rejection rate in biometric authentication, and improve authentication accuracy.

B. Second embodiment:
FIG. 5A is a schematic diagram showing the configuration of the display screen 121A when a new registration process is executed as a second embodiment of the present invention. FIG. 5A is different from FIG. 4 except that the content of the message displayed on the message display unit 122 is different and that a verification level indicator display unit 123A is provided instead of the verification level indicator display unit 123. It is almost the same as (A). The configuration of the biometric information authentication apparatus and the new registration process in the second embodiment are the same as those in the first embodiment (FIGS. 1 and 3).

  In the matching degree indicator display unit 123A of the second embodiment, two indexes 123i indicating the fluctuation reference range of the matching degree are added to the matching degree indicator display unit 123 of the first embodiment. Here, the “reference range fluctuation reference range” means a range of change in the verification level that the identity rejection rate can be reduced at the time of authentication. That is, when the matching degree fluctuates within the range between the two indexes 123i, it is indicated that it is preferable to register temporary registration data as regular registration data. Can be used as a criterion for issuing

  FIGS. 5B and 5C are explanatory diagrams showing only the matching degree indicator display portion 123A in the display screen 121A. FIG. 5B shows the matching degree indicator display unit 123A when the matching degree is within the fluctuation reference range, and FIG. 5C shows the matching degree when the matching degree is out of the fluctuation reference range. An indicator display unit 123A is shown. The bar graph bg in FIG. 5B is blue, and the bar graph bg in FIG. 5C is red. As described above, the matching degree indicator display unit 123A notifies the user that the matching degree is out of the fluctuation reference range by changing the color of the bar graph bg.

  In the message display section 122 (FIG. 5A) of the display screen 121A, if the color of the bar graph bg of the matching degree indicator display section 123A changes and falls outside the fluctuation reference range, provisional registration is performed. A message that recommends re-acquiring data is displayed. In addition to this, the message display unit 122 may display guidance that allows the user to easily make an appropriate determination.

  According to the configuration of the second embodiment, the index 123i indicates to the user a criterion for determining whether or not the provisional registration data should be registered properly, so that the user can more easily make the determination. . Therefore, it is possible to ensure that biometric information with higher reproducibility is registered.

C. Third embodiment:
FIG. 6 is a block diagram showing a biometric information authentication device 1000A that authenticates a user using an IC card in which finger vein information is written together with the user's personal information. FIG. 6 is substantially the same as FIG. 1 except that an IC card reader / writer 130 is added to the user interface unit 100.

  The IC card reader / writer 130 is a device that can read information from and write information to an inserted IC card. When executing the authentication process, the user inserts an IC card in which biometric information is registered into the IC card reader / writer 130. The control unit 200 reads the finger vein information of the IC card, acquires data for authentication from the user, and performs authentication processing. The registration of finger vein information to the IC card is performed in the same manner as the new registration process of the second embodiment.

  FIG. 7 is a flowchart showing a processing procedure of update registration processing executed by the control unit 200 when performing update registration for switching from a conventional IC card to a new IC card in the biometric information authentication apparatus 1000A. In this update registration process, whether the regular registration data registered in the old IC card is registered in the new IC card and continues to be used, or newly acquired finger vein information is newly registered. After confirmation, update registration to a new IC card is executed. Hereinafter, the process for performing the confirmation is referred to as “continuous use confirmation process”.

  The user inserts the old IC card to be updated into the IC card reader / writer 130, and instructs the biometric information authentication apparatus 1000A to execute the IC card update registration process. The control unit 200 reads the registered finger vein information from the IC card, and temporarily stores it in the temporary registration data storage unit 400 (step S200). Hereinafter, this finger vein information is referred to as “update target data”.

  Next, a control part performs a continuous use confirmation process (step S210-S250). By this process, it is possible to ensure that biometric information with high reproducibility is registered by update registration. This process is executed in the same manner as the registration confirmation process (steps S140 to S180) of the new registration process described with reference to FIG. 2, and the differences will be described below.

  FIG. 8 is a schematic diagram showing the configuration of the display screen 121B displayed on the touch panel 120 when the continuous use confirmation process is executed. FIG. 8 is almost the same as FIG. 5A except that the content of the message displayed on the message display unit 122 is different and the two touch buttons 126 and 127 displayed are different.

  The continuous use touch button 126 on the display screen 121B is a touch button selected by the user when the update target data is registered in the new IC card and used continuously. The new acquisition touch button 127 is a touch button selected by the user when acquiring new finger vein information separately from the update target data and registering it in the new IC card.

  In the message display unit 122 of the display screen 121B, an instruction for placing a finger on the sensor with respect to the user and explanations of these two touch buttons 126 and 127 are displayed. Further, the message display unit 122 displays a message indicating that it is recommended to press the new acquisition touch button 127 when the matching level shown in the matching level indicator display unit 123A is lower than the fluctuation reference range.

  When the control unit 200 detects that the user has placed a finger on the detection element 111 (FIG. 2) of the finger vein information input unit 110, the control unit 200 starts acquiring data for authentication (FIG. 7; step S210). Next, the control unit 200 causes the authentication processing unit 500 to collate data to be authenticated and update target data (step S220). If the collation degree calculated at this time is within the authenticable range, it is displayed on the collation degree indicator display section 123A of the display screen 121B. This continuous use confirmation process is repeated until the user presses one of the two touch buttons 126 and 127.

  If the matching level is out of the authenticable range in step S230, the matching level is not displayed on the matching level indicator display unit 123A. Accordingly, even when the IC card update registration process is executed by a third party who is not an authorized user registered in the IC card, the degree of matching between the registered finger vein information and the third party's finger vein information Cannot be known by a third party. Therefore, for example, a malicious action by a third party such as executing a spoofing action using the matching degree of the matching degree indicator display unit 123A as an index can be suppressed.

  In step S250, when the user presses the continuous use touch button 126, the control unit 200 causes the IC card reader / writer 130 to delete the old IC card data. Subsequently, the control unit 200 instructs the user to replace the old IC card of the IC card reader / writer 130 with a new IC card, and writes the update target data to the new IC card after the replacement. (Step S270).

  When the user presses the new acquisition touch button 127 in steps S230 and S250, the control unit 200 discards the old IC card and deletes the update target data in the temporary registration data storage unit 400. A process for newly acquiring vein information is started (step S290). The processing step in step S290 is executed in the same manner as the new registration process (FIG. 3) described in the first embodiment, and the acquired temporary registration data is registered in the IC card as a regular registration.

  Thus, according to the configuration of the third embodiment, the user can know the level of reproducibility of the registered update target data by the display of the matching degree indicator display unit 123A. Therefore, it is possible to ensure that finger vein information with high reproducibility is updated and registered. Also, if it can be determined that the finger vein information to be updated is highly reproducible, the finger vein information can be continuously used without newly acquiring the finger vein information, so the update registration process is executed efficiently. be able to.

D. Fourth embodiment:
FIG. 9 is a flowchart showing a processing procedure of finger placement position confirmation processing executed in the biometric information authentication apparatus as the fourth embodiment of the present invention. The “finger placement position confirmation process” is a process for allowing the user to confirm a suitable finger placement position on the detection element 111 (FIG. 2) of the finger vein information input unit 110 when executing the authentication process. The configuration of the biometric information authentication apparatus of the fourth embodiment is the same as that of the third embodiment (FIG. 6).

  The control unit 200 reads the registered finger vein information from the IC card inserted by the user into the IC card reader / writer 130 and transmits it to the authentication processing unit 500 (step S300). Hereinafter, this finger vein information is referred to as “registered data”. The control unit 200 displays guidance regarding execution of processing on the touch panel 120 (step S310).

  FIG. 10A is a schematic diagram illustrating an example of a guidance display screen displayed on the touch panel 120. This display screen 121B is provided with a message display section 122, a matching degree indicator display section 123B, and a confirmation touch button 128.

  The matching degree indicator display part 123B of the display screen 121B is replaced with two indices 123i indicating the matching degree fluctuation reference of the matching degree indicator display part 123A (FIG. 8) of the third embodiment as a matching degree change history. Indicators 123mn and 123mx indicating the minimum value and the maximum value of the matching degree are provided. Thereby, the user can know the range in which the matching degree fluctuates, and can use it as a guideline for specifying the finger placement state suitable for authentication.

  The message display unit 122 displays a message indicating that the finger is placed on the detection element 111 (FIG. 2) of the finger vein information input unit 110 and the finger placement position relative to the detection element 111 is gradually changed according to the instructions on the screen. Is done. Specifically, a message indicating that the finger is slowly reciprocated is displayed by displacing the angle in a direction (plane direction) along the surface on which the finger is arranged in the detection element 111. In addition, a message is displayed to the effect that the confirmation touch button 128 is pressed when the matching level shown in the matching level indicator display unit 123B is near the maximum value. That is, by following this guidance display, the user can specify the finger placement angle along the surface direction of the detection element 111 suitable for authentication.

  When the control unit 200 detects that a finger is placed on the detection element 111, the control unit 200 acquires finger vein information by the finger vein information input unit 110 and the feature amount extraction unit 300 (S320). This finger vein information is referred to as “confirmation data”. The control unit 200 causes the authentication processing unit 500 to calculate a matching degree between the confirmation data and the registered data (step S330).

  When the calculated collation degree is within the authenticable range, the collation degree is displayed on the collation degree indicator display unit 123B. The processes in steps S320 to S350 so far are repeated until the user presses the confirmation touch button 128 on the display screen 121B. The degree of matching varies continuously. Further, the positions of the two indices 123mn and 123mx are also changed in accordance with the change in the matching degree, and the fluctuation range of the matching degree is displayed. Thus, the user can easily determine whether or not the matching degree is in the vicinity of the maximum value. Note that the repeated processing from step S320 to S360 is referred to as “finger position adjustment processing”.

  When the confirmation touch button 128 is pressed, the control unit 200 changes the guidance display and executes the same finger position adjustment process (step S370). The control unit 200 updates the guidance display on the touch panel 120 (step S310).

  FIG. 10B is almost the same as FIG. 10A except that the message content displayed on the message display portion 122 is different. The message display unit 122 displays a message indicating that the finger placement state is further changed while maintaining the angle of the finger surface direction specified in the finger position adjustment processing so far. Specifically, it is displayed that the finger arranged on the detection element 111 is rotated and reciprocated in the circumferential direction of the abdomen of the finger. Similarly to the previous step, the message display unit 122 displays a message indicating that the confirmation touch button 128 is pressed when the matching degree indicator display unit 123B is near the maximum value. That is, by following this guidance display, the user can specify the finger placement angle along the circumferential direction of the abdomen of the finger suitable for authentication.

  Thereafter, the control unit 200 repeats the finger position adjustment process again until the confirmation touch button 128 is pressed by the user. When the user presses the confirmation touch button 128, the control unit 200 regards that a series of finger placement position confirmation processing has been completed, and displays guidance on the touch panel 120 (step S380).

  FIG. 11A is an explanatory diagram illustrating an example of a display screen displayed on the touch panel 120 in step S380. This display screen 121C displays that the finger placement state specified by the series of finger placement position confirmation processing described above is a suitable placement state for authentication.

  Each of FIGS. 11B and 11C shows another example displayed on the touch panel 120 in step S380. FIG. 11B is a display screen that the control unit 200 displays on the touch panel 120 when the calculated matching degree is out of the authenticable range in step S340. In this display screen 121D, the type of finger placed on the detection element 111 may be different from the finger used to acquire the registered finger vein information. It is displayed that it is recommended to execute the finger placement position confirmation process.

  In FIG. 11C, in step S340, if the maximum value of the matching degree is lower than a predetermined value (for example, 85% or less) even if the confirmation processing in steps S320 to S350 is repeated for a predetermined time, the control unit 200 , A display screen displayed on the touch panel 120. Since the reproducibility of the registered finger vein information may be low on this display screen 121E, it is displayed that re-registration of finger vein information is recommended.

  Thus, by displaying the matching degree and the maximum value and the minimum value as the history of the fluctuation range on the matching degree indicator display unit 123B, the user can arrange the finger on the detection element 111 (FIG. 2) more suitable. The status can be grasped, and the rejection rate for authentication can be reduced. In addition, it is possible to teach the user appropriate guidance according to the value of the collation degree, and to prompt the execution of processing for improving the authentication accuracy.

E. Variations:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

  In the above embodiment, a part of the configuration realized by hardware may be replaced with software, and conversely, a part of the configuration realized by software may be replaced by hardware. For example, it is possible for the control unit 200 to execute part of the functions of the feature amount extraction unit 300 and the authentication processing unit 500 as a program.

E1. Modification 1:
In the above embodiment, finger vein information is used as the biological information. However, other types of biological information such as fingerprints, irises, and faces may be used.

E2. Modification 2:
In the above-described embodiment, the matching degree is visually displayed by the matching degree indicator display units 123, 123A, and 123B to notify the user, but the matching degree may be notified to the user by other methods. For example, the collation degree may be notified by other visual means such as color change or numerical display instead of a bar graph, or may be notified by audio means such as voice. In addition, it may be notified by tactile means such as a change in the intensity of vibration according to the matching degree. As described above, any means for notifying the user of the matching degree may be any means that can be recognized through a human quintet.

E3. Modification 3:
In the said Example, although the collation degree indicator display part 123,123A, 123B displayed the collation degree in the authenticable range, it is assumed that even if it is outside the authenticable range, the collation degree is displayed. Also good. On the other hand, when the collation degree is a low value outside the authenticable range, the collation degree may be displayed to warn the user.

E4. Modification 4:
In the above embodiment, the matching degree indicator display units 123, 123A, and 123B display the matching degree. However, in addition to the matching degree or in place of the matching degree, the authentication processing unit 500 repeats the matching. The average value of the matching level that varies may be displayed. Further, in the finger placement position confirmation process of the fourth embodiment, the matching degree indicator display unit 123B that displays the range in which the matching degree fluctuated is used. In the new registration process and the update registration process, this matching degree is displayed. The indicator display unit 123B may be used.

E5. Modification 5:
In the above-described embodiment, the matching degree is displayed on the matching degree indicator display units 123, 123A, and 123B in the new biometric information registration process, the update registration process, and the finger placement position confirmation process, but is displayed in other processes. It is good as a thing. For example, the verification indicator display units 123, 123A, and 123B may be displayed in a process in which biometric information is collated as in the authentication process.

E6. Modification 6:
In the third embodiment, the finger vein information update registration process registered in the IC card is executed. However, when the finger vein information registered in another storage medium such as the regular registration data storage unit 600 is updated and registered, A similar update registration process may be executed.

The block diagram which shows the structure of the biometric information authentication apparatus of 1st Example. Explanatory drawing for demonstrating the state by which the finger | toe is arrange | positioned at the detection element of a finger vein information input part. The flowchart which shows the process sequence of the new registration process of finger vein information. Schematic which shows an example of the display screen of a touch panel in a new registration process. Schematic which shows the other example of the display screen of a touchscreen in a new registration process. The block diagram which shows the structure of the biometric information authentication apparatus of 3rd Example. The flowchart which shows the process sequence of the update registration process of finger vein information. Schematic which shows the other example of the display screen of a touchscreen in an update registration process. The flowchart which shows the process sequence of a finger arrangement | positioning position confirmation process. Schematic which shows an example of the display screen of a touchscreen in a finger arrangement position confirmation process. Explanatory drawing which shows an example of the display screen of a touch panel in a finger arrangement position confirmation process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... User interface part 1000, 1000A ... Biometric information authentication apparatus 110 ... Finger vein information input part 111 ... Detection element 111s ... Side 120 ... Touch panel 121, 121A, 121B, 121C, 121D, 121E ... Display screen 122 ... Message display part 123, 123A, 123B ... Collation degree indicator display unit 123i, 123mn, 123mx ... Indicators 124, 125, 126, 127, 128 ... Touch buttons 130 ... IC card reader / writer 200 ... Control unit 300 ... Feature quantity extraction unit 400 ... Temporary registration Data storage unit 500 ... Authentication processing unit 600 ... Regular registration data storage unit YF ... Finger bg ... Bar graph

Claims (7)

A biometric information authentication device for authenticating biometric information,
A biometric information storage unit that stores the registered first biometric information serving as a reference for authentication;
A biometric information acquisition unit that acquires second biometric information to be authenticated;
An authentication execution unit that executes an authentication process for obtaining a degree of matching between the first and second biological information;
An authentication result notification unit for notifying a user of the authentication result of the authentication execution unit;
With
The authentication execution unit calculates a degree of matching of the second biological information with respect to the first biological information, and the authentication result notification unit notifies the user of the degree of matching. The biometric information authentication device according to claim 1,
The authentication execution unit repeatedly calculates the degree of matching while the living body is placed on the biometric information acquisition unit, and the authentication result notification unit calculates the degree of matching every time the degree of matching is calculated. A biometric information authentication apparatus that notifies the user. The biometric information authentication device according to claim 1 or 2,
The said authentication result notification part is a biometric information authentication apparatus which notifies the said range of the said matching degree calculated over multiple times to the said user. The biometric information authentication device according to any one of claims 1 to 3, further comprising:
A registration execution unit for performing update registration of the first biometric information;
The first biometric information includes regular registered biometric information that is properly registered and provisionally registered biometric information before being registered normally,
The pre-authentication execution unit calculates the degree of matching between the temporary registration biometric information and the second biometric information, and the authentication result notification unit notifies the user of the degree of matching,
The registration execution unit executes update registration using the temporary registration biometric information as the regular registration biometric information in accordance with an instruction from the user, or discards the temporary registration biometric information without properly registering, Biometric information authentication device. The biometric information authentication device according to any one of claims 1 to 4,
The biometric information authentication device, wherein the authentication result notification unit executes the notification of the degree of matching only when the degree of matching is greater than a predetermined value. The biometric information authentication device according to any one of claims 1 to 5,
The authentication result notification unit is a biometric information authentication device that notifies the user of guidance regarding the method of acquiring the second biometric information for improving the degree of matching according to the value of the degree of matching. A biometric information registration method in a biometric information authentication device for authenticating a user using biometric information,
(A) the biometric information authentication device acquires and temporarily registers the first biometric information of the user;
(B) The biometric information authentication device acquires the second biometric information of the user and calculates the degree of matching between the first and second biometric information;
(C) The biometric information authentication device notifies the user of the degree of matching;
A biometric information registration method comprising:

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