INDIVIDUAL IDENTIFICATION DEVICE, AND IDENTIFICATION THRESHOLD SETTING METHOD

• US 20160292536A1
• Filed: 10/30/2015
• Published: 10/06/2016
• Est. Priority Date: 03/30/2015
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Fukuda, Kenji, Irie, Atsushi
• Granted Patent: US 9,875,425 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 18/22 Matching criteria, e.g. proximity measures
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06V 40/172 Classification, e.g. identification
• CPC Class Codes: G06V 40/70 Multimodal biometrics, e.g. combining information from different biometric modalities
• CPC Class Codes: H04L 63/0861 using biometrical features, e.g. fingerprint, retina-scan cryptographic mechanisms or cryptographic arrangements for entity authentication using biological data H04L9/3231
• CPC Class Codes: H04L 9/3231 Biological data, e.g. fingerprint, voice or retina network architectures or network communication protocols for supporting authentication of entities using biometrical features in a packet data network H04L63/0861
• CPC Class Codes: H04W 12/065 Continuous authentication

Abstract

Provided is an individual identification device including: a biometric information storage unit; a biometric information acquisition unit; an identification unit which calculates a similarity of the biometric information on the subject and the registrant and performs identification of the subject according to whether or not the calculated similarity is equal to or higher than an identification threshold; an identification result storage unit which stores identification result information constituted by the calculated similarity and a correct identification result; and a threshold setting unit which sets the identification threshold such that at least either one of a false rejection rate and a false acceptance rate fulfils a predetermined condition in the identification result information stored in the identification result storage unit.

Claims

1. An individual identification device comprising:

a biometric information storage unit adapted to store biometric information on a registrant;

a biometric information acquisition unit adapted to acquire biometric information on a subject;

an identification unit adapted to calculate a similarity of the biometric information on the subject and the biometric information on the registrant and perform identification of the subject according to whether or not the calculated similarity is equal to or higher than an identification threshold;

an identification result storage unit adapted to store identification result information constituted by the similarity calculated by the identification unit and a correct identification result in the identification; and

a threshold setting unit adapted to set the identification threshold such that at least either one of a false rejection rate and a false acceptance rate fulfils a predetermined condition in the identification result information stored in the identification result storage unit.

2. The individual identification device according to claim 1, wherein

the threshold setting unit sets the identification threshold by using identification result information relating to a predetermined number of most recent identifications or identification performed in a most recent predetermined period.

3. The individual identification device according to claim 1, wherein

the threshold setting unit sets the identification threshold by assigning a weight which is larger for identification result information relating to most recently performed identification.

4. The individual identification device according to claim 1, wherein

the predetermined condition is that the false rejection rate and false acceptance rate are substantially equal to each other.

5. The individual identification device according to claim 1, wherein

the predetermined condition is that the false rejection rate is equal to or less than a first threshold.

6. The individual identification device according to claim 1, wherein

the predetermined condition is that the false acceptance rate is equal to or less than a second threshold.

7. The individual identification device according to claim 1, wherein

the threshold setting unit sets the identification threshold each time the identification is performed by the identification unit.

8. The individual identification device according to claim 1, wherein

the threshold setting unit sets the identification threshold each time the identification unit performs the identification a predetermined number of times after the previous identification threshold setting has been performed.

9. The individual identification device according to claim 8, wherein

the predetermined number of times is variable and determined to be smaller as a variation in a value of the similarity calculated by the identification unit becomes larger.

10. The individual identification device according to claim 1, wherein

the threshold setting unit does not set the identification threshold until the number of pieces of the identification result information accumulated in the identification result storage unit becomes a third threshold or higher.

11. The individual identification device according to claim 10, wherein

the threshold setting unit does not set the identification threshold until the number of pieces of identification result information which are accumulated in the identification result storage unit and in which the subject is the registrant becomes a fourth threshold or higher and the number of pieces of identification result information which are accumulated in the identification result storage unit and in which the subject is not the registrant becomes a fifth threshold or higher.

12. The individual identification device according to claim 1, further comprising a second identification unit adapted to perform identification of the subject on the basis of information different from the information used in the identification unit,

wherein when identification is performed by the identification unit and the second identification unit and the results thereof are different, the identification result obtained by the second identification unit is determined to be the correct identification result.

13. The individual identification device according to claim 1, wherein

biometric information on a plurality of registrants is stored in the biometric information storage unit, and

the identification threshold is set individually for each of the plurality of registrants.

14. The individual identification device according to claim 1, wherein

the biometric information is a face.

15. An identification threshold setting method for use in an individual identification device that includes a biometric information storage unit adapted to store biometric information on a registrant;

a biometric information acquisition unit adapted to acquire biometric information on a subject; and

an identification unit adapted to calculate a similarity of the biometric information on the subject and the biometric information on the registrant and perform identification of the subject according to whether or not the calculated similarity is equal to or higher than an identification threshold, the method comprising;

an identification result storage step of storing identification result information constituted by the similarity calculated by the identification unit and a correct identification result in the identification; and

a threshold setting step of setting the identification threshold such that at least either one of a false rejection rate and a false acceptance rate fulfils a predetermined condition in the identification result information stored in the identification result storage step.

16. A computer-readable medium storing program for setting an identification threshold which is to be used in an individual identification device that includes a biometric information storage unit adapted to store biometric information on a registrant;

a biometric information acquisition unit adapted to acquire biometric information on a subject; and

an identification unit adapted to calculate a similarity of the biometric information on the subject and the biometric information on the registrant and perform identification of the subject according to whether or not the calculated similarity is equal to or higher than an identification threshold, the program causing a computer to execute;

an identification result storage step of storing identification result information constituted by the similarity calculated by the identification unit and a correct identification result in the identification; and

a threshold setting step of setting the identification threshold such that at least either one of a false rejection rate and a false acceptance rate fulfils a predetermined condition in the identification result information stored in the identification result storage step.