| CPC G06V 40/70 (2022.01) [G06V 20/52 (2022.01); G06V 40/103 (2022.01); G06V 40/171 (2022.01); G06V 40/19 (2022.01); G06V 40/197 (2022.01); G06V 2201/07 (2022.01)] | 9 Claims |

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1. An authentication device comprising:
a memory storing instructions; and
at least one processor configured to execute the instructions to perform:
detecting an authentication target who is moving toward an exit of a predetermined area;
extracting first biological information of the authentication target from a first image in which an entire body of the authentication target is captured, the first image including the authentication target captured by a first image device;
extracting second biological information of the authentication target from a second image in which an iris of at least one of a right eye and a left eye of the authentication target is captured, the second biological information being different in type from the first biological information, the second image captured by a second image device after the first image is captured by the first image device;
determining whether to authenticate the authentication target using the first biological information and the second biological information; and
adjusting an authentication timing in such a way that a third authentication is executed after a first authentication, a second authentication is executed after the third authentication, and the first authentication, the third authentication, and the second authentication are completed within a time period in which the authentication target is moving toward the exit of the predetermined area.
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