Authentication apparatus, control method, and computer-readable medium

1 . An authentication apparatus comprising:

at least one memory storing instructions; and

at least one processor configured to execute the instructions to:

acquire a target image including a face of a target entity; and

authenticate the target entity,

wherein the authentication of the target entity includes:

extracting face information of the target entity from the target image;

determining, for two or more registered entities, whether the registered entity matches the target entity by using face information of the registered entity and the face information of the target entity; and

only if it is determined that there is no registered entity that matches the target entity, detecting a symbol representing identification information from the target image and determining whether there is the registered entity associated with the identification information represented by the symbol,

wherein the symbol is displayed on an attachment worn on a face; and

wherein the symbol is not used for identifying the target entity if it is determined that there is the registered entity that matches the target entity.

2 . The authentication apparatus according to claim 1 ,

wherein the authentication of the target entity includes:

computing, for one or more of the registered entities, an authentication score indicating a level of a probability that the target entity matches the registered entity by using the face information of the registered entity and the face information of the target entity; and

in a case where there is no registered entity whose authentication score is greater than a first threshold, determining whether there is the registered entity associated with the identification information represented by the symbol among registered persons satisfying a predetermined condition based on the authentication score.

3 . The authentication apparatus according to claim 2 ,

wherein the at least one processor is further configured to determine whether the target entity wears the attachment by using the target image,

wherein the authentication of the target entity includes:

in a case where it is determined that the target entity does not wear the attachment, computing the authentication score by using first type face information that is face information of the registered entity in a state of not wearing the attachment; and

in a case where it is determined that the target entity wears the attachment, computing the authentication score by using second type face information that is face information of the registered entity in a state of wearing the attachment.

4 . The authentication apparatus according to claim 3 , wherein the second type face information is generated by using a face image of the registered entity in a state in which the attachment is worn, the face image being generated by superimposing an image of the attachment on a face image of the registered entity in a state in which the attachment is not worn.

5 . The authentication apparatus according to claim 4 , wherein in a case where it is determined that the target entity wears the attachment, the authentication of the target entity includes acquiring a face image of the registered entity from the first type face information, and generates the second type face information by superimposing the image of the attachment on the face image.

6 . The authentication apparatus according to claim 2 ,

wherein the face information of the registered entity includes an image feature value of the face of the registered entity and three-dimensional data of the face of the registered entity,

wherein the at least one processor is further configured to acquire three-dimensional data of a face of the target entity, and

wherein the authentication of the target entity includes computing the authentication score by using both the image feature value of the face and three-dimensional data of the face.

7 . The authentication apparatus according to claim 1 , wherein the at least one processor is further configured to, in a case where the symbol is not detected from the target image, output a message prompting attachment of the attachment on which the symbol is displayed.

8 . The authentication apparatus according to claim 2 , wherein the at least one processor is further configured to, in a case where there is a registered entity associated with the identification information represented by the symbol among registered entities that do not satisfy a predetermined condition based on the authentication score, output a notification to the registered entity.

9 . The authentication apparatus according to claim 2 , wherein a registered entity satisfying the predetermined condition is a registered entity having a predetermined rank or higher in descending order of the authentication score.

10 . The authentication apparatus according to claim 2 ,

wherein a registered entity satisfying the predetermined condition is a registered entity whose authentication score is greater than a second threshold, and

wherein the second threshold is smaller than the first threshold.

11 . The authentication apparatus according to claim 1 , wherein the authentication of the target entity includes detecting the symbol from a face area of the target entity included in the target image.

12 . The authentication apparatus according to claim 1 , wherein the authentication of the target entity includes detecting an area representing the attachment from the target image, and detecting the symbol from the area representing the attachment.

13 . A control method executed by a computer, the control method comprising:

acquiring a target image including a face of a target entity; and

authenticating the target entity,

wherein the authentication of the target entity includes:

extracting face information of the target entity from the target image;

determining, for two or more registered entities, whether the registered entity matches the target entity by using face information of the registered entity and the face information of the target entity;

only if it is determined that there is no registered entity that matches the target entity, detecting a symbol representing identification information from the target image and determining whether there is the registered entity associated with the identification information represented by the symbol,

wherein the symbol is displayed on an attachment worn on a face, and

wherein the symbol is not used for identifying the target entity if it is determined that there is the registered entity that matches the target entity.

14 . A non-transitory computer-readable medium storing a program that causes a computer to execute:

acquiring a target image including a face of a target entity; and

authenticating the target entity,

wherein the authentication of the target entity includes:

extracting face information of the target entity from the target image;

determining, for two or more registered entities, whether the registered entity matches the target entity by using the face information of the registered entity and the face information of the target entity; and

only if it is determined that there is no registered entity that matches the target entity, detecting a symbol representing identification information from the target image and determining whether there is the registered entity associated with the identification information represented by the symbol,

wherein the symbol is displayed on an attachment worn on a face, and

wherein the symbol is not used for identifying the target entity if it is determined that there is the registered entity that matches the target entity.