Granted Patent B2

US 12,489,634 · App. 17/918,608 · Granted Dec 2, 2025

Inventor: Yoshihiro Kajiki (Tokyo, JP)

Assignee: NEC CORPORATION

H04L9/3231G06F3/013G06T7/70G06V40/172G06V40/40H04L9/3271G06T2207/30201

Abstract

Claims (47)

1 . An authentication device which authenticates a target, the authentication device comprising:

a memory storing instructions; and

one or more processors configured to execute the instructions to:

output a plurality of candidate responses to a question to the target, on a display device;

specify a response to the question from among the candidate responses based on a gaze of the target in a plurality of face images captured by an imaging device;

obtain response time at which the target specified the response;

make a correctness or incorrectness judgment of the specified response;

perform face authentication of the target from the face images;

obtain a result of the face authentication performed at a same time as the response time;

authenticate that the target is a living body based on the face image;

perform biometrics determination of the target based on changes in the gaze of the target;

authenticate the target based on results of the correctness or incorrectness judgment, the biometrics determination, and the face authentication; and

detect a relative angle change of the gaze with respect to a direction of a face of the target while the target changes the gaze thereof and selects a response, and perform the biometrics determination based on the relative angle change.

2 . The authentication device according to claim 1 , wherein the processor further executes instructions to output, on the display device, the candidate responses corresponding to target-specific questions upon the face authentication.

3 . The authentication device according to claim 1 , wherein the processor further executes instructions to:

specify the response based on the gaze of the target in a first face image captured by a first imaging device; and

perform the face authentication from a second face image captured by a second imaging device.

4 . An authentication system which authenticates a target, the authentication system comprising:

an imaging device which captures a face image of the target; a memory storing instructions; and

one or more processors configured to execute the instructions to:

output a plurality of candidate responses to a question to the target, on a display device;

specify a response to the question from among the candidate responses based on a gaze of the target in a plurality of face images captured by an imaging device;

obtain response time at which the target specified the response;

make a correctness or incorrectness judgment of the specified response;

perform face authentication of the target from the face images;

obtain a result of the face authentication performed at a same time as the response time;

authenticate that the target is a living body based on the face image;

perform biometrics determination of the target based on changes in the gaze of the target;

authenticate the target based on results of the correctness or incorrectness judgment, the biometrics determination, and the face authentication; and

detect a relative angle change of the gaze with respect to a direction of a face of the target while the target changes the gaze thereof and selects a response, and perform the biometrics determination based on the relative angle change.

5 . The authentication system according to claim 4 , comprising a first imaging device and a second imaging device which respectively capture a first image and a second face image of the target,

wherein the processor further executes instructions to:

specify the response based on the gaze of the target in the first face image captured by the first imaging device; and

perform the face authentication from the second face image captured by the second imaging device.

6 . An authentication method which authenticates a target, the authentication method performed by a processor and comprising:

outputting a plurality of candidate responses to a question to the target, on a display device;

specifying a response to the question from among the candidate responses based on a gaze of the target in a plurality of face images captured by an imaging device;

obtaining response time at which the target specified the response; making a correctness or incorrectness judgment of the specified response;

performing face authentication of the target from the face images;

obtaining a result of the face authentication performed at a same time as the response time;

authenticating that the target is a living body based on the face image;

performing biometrics determination of the target based on changes in the gaze of the target;

authenticating the target based on results of the correctness or incorrectness judgment, the biometrics determination, and the face authentication; and

detect a relative angle change of the gaze with respect to a direction of a face of the target while the target changes the gaze thereof and selects a response, and perform the biometrics determination based on the relative angle change.

7 . The authentication device according to claim 1 , wherein the processor further executes the instructions to prevent spoofing using a time difference.

8 . The authentication device according to claim 1 , wherein the processor further executes the instructions to perform the face authentication and a measurement of the gaze of the target to select the response multiple times in parallel to verifying that the gaze of the target is moving.

9 . The authentication device according to claim 1 , wherein the authenticate that the target is a living body comprises determining that the target is a living body upon detecting that the relative angle is greater than a predetermined amount of change.

Assignments (1)

Continuity (1)

References Cited (43)