Authentication system, authentication apparatus, authentication method and computer program

An authentication method performed by a computer and comprising:

• acquiring a face image of a target passing a gate;
• acquiring attribute information including at least one of personal information belonging to the target and information related to boarding;
• performing a face authentication, in which whether or not the target is a registered target is determined, by collating information obtained from the face image of the target with information about a plurality of faces of a respective plurality of registered targets;
• and
• determining whether or not the target is permitted to pass through the gate based on whether or not a number of times of that the face authentication was successful, when the face authentication has been performed a plurality of times, is equal to or greater than a threshold value that is set based on the attribute information of the target.

A non-transitory recording medium storing a computer program executable by a computer to perform processing comprising:

• acquiring a face image of a target passing a gate;
• acquiring attribute information including at least one of personal information belonging to the target and information related to boarding;
• performing a face authentication, in which whether or not the target is a registered target is determined, by collating information obtained from the face image of the target with information about a plurality of faces of a respective plurality of registered targets;
• and
• determining whether or not the target is permitted to pass through the gate based on whether or not a number of times of that the face authentication was successful, when the face authentication has been performed a plurality of times, is equal to or greater than a threshold value that is set based on the attribute information of the target.