Person specifying device, person specifying method, and recording medium

1. A person specifying device comprising:

a memory storing instructions; and

at least one processor configured to execute the instructions to:

acquire a captured image capturing a person boarding a moving vehicle,

perform a matching determination as to whether or not the person reflected in the captured image matches a pre-registered person,

generate person-specifying information representing the person determined via the matching determination;

update a time interval for performing the matching determination to be shorter when failing to achieve a success frequency of authentication above a desired value via the matching determination; and

update the time interval for performing the matching determination to be shorter due to an incapacity of achieving the success frequency of authentication above the desired value due to a shorter time interval in turning on and off power of the moving vehicle.

2. The person specifying device according to claim 1 , wherein the at least one processor is configured to execute the instructions to update the time interval for performing the matching determination to be shorter due to an incapacity of achieving the success frequency of authentication above the desired value which arises from a low probability of making a successful authentication of the person via the matching determination.

3. The person specifying device according to claim 1 , wherein the at least one processor is configured to execute the instructions to determine either a successful authentication or a failed authentication with respect to the person based on the person-specifying information, which is determined via the matching determination with respect to the person reflected in each of multiple captured images obtained over a lapse of time, and a likelihood of the person-specifying information indicating a predetermined person.

4. The person specifying device according to claim 3 , wherein the at least one processor is configured to execute the instructions to determine a failure of achieving the success frequency of authentication above the desired value when failing to specify the predetermined person using a predetermined number of captured images with the likelihood above a predetermined threshold value based on the person-specifying information determined using the predetermined number of captured images and the likelihood of the person-specifying information indicating the predetermined person.

5. The person specifying device according to claim 1 , wherein the at least one processor is configured to execute the instructions to change an imaging-environment parameter used to generate the captured image when failing to achieve the success frequency of authentication above the desired value.

6. A person specifying device comprising:

a memory storing instructions; and

at least one processor configured to execute the instructions to:

perform a matching determination as to whether or not a person reflected in a captured image obtained from an imaging device matches a pre-registered person, generate person-specifying information representing the person determined via the matching determination;

update a time interval for performing the matching determination to be shorter when failing to achieve a success frequency of authentication above a desired value via the matching determination; and

update the time interval for performing the matching determination to be shorter due to an incapacity of achieving the success frequency of authentication above the desired value due to a shorter time interval in turning on and off power of the moving vehicle.

7. A person specifying method comprising:

acquiring a captured image capturing a person boarding on a moving vehicle;

performing a matching determination as to whether or not the person reflected in the captured image matches a pre-registered person;

generating person-specifying information representing the person determined via the matching determination;

updating a time interval for performing the matching determination to be shorter when failing to achieve a success frequency of authentication above a desired value via the matching determination; and

updating the time interval for performing the matching determination to be shorter due to an incapacity of achieving the success frequency of authentication above the desired value due to a shorter time interval in turning on and off power of the moving vehicle.

8. A non-transitory storage medium configured to store a program causing a computer to:

acquire a captured image capturing a person boarding a moving vehicle,

perform a matching determination as to whether or not the person reflected in the captured image matches a pre-registered person,

generate person-specifying information representing the person determined via the matching determination;

update a time interval for performing the matching determination to be shorter when failing to achieve a success frequency of authentication above a desired value via the matching determination; and

update the time interval for performing the matching determination to be shorter due to an incapacity of achieving the success frequency of authentication above the desired value due to a shorter time interval in turning on and off power of the moving vehicle.