Methods and apparatuses for adaptively updating enrollment database for user authentication

A non-transitory computer-readable medium comprising program code that, when executed by a processor, causes the processor to perform

• extracting a first feature vector from an input image, the input image including a face of a user;
• determining whether to enroll the input image in an enrollment database based on the first feature vector, second feature vectors of enrollment images and a representative vector, the second feature vectors of the enrollment images being enrolled in the enrollment database, and the representative vector representing the second feature vectors, the first feature vector being different than the second feature vectors and the representative vector, the determining whether to enroll the input image including,
• (i) determining whether the input image is an outlier based on the first feature vector and the representative vector, and
• (ii) determining whether a feature range of the enrollment database is increased based on the first feature vector and the second feature vectors;
• and
• enrolling the input image in the enrollment database based on a result of the determining.

An adaptive updating apparatus of an enrollment database, the adaptive updating apparatus comprising:

• a memory configured to store the enrollment database and storing computer-readable instructions;
• and
• one or more processors configured to execute the computer-readable instructions such that the one or more processors is configured to cause the adaptive updating apparatus to,
• extract a first feature vector from an input image, the input image including a face of a user, and
• enroll the input image by determining whether to enroll the input image in the enrollment database based on (i) whether the input image is an outlier based on the first feature vector and a representative vector and (ii) whether a feature range of the enrollment database is increased based on the first feature vector and second feature vectors of enrollment images, the second vectors being enrolled in the enrollment database, the representative vector representing the second feature vectors, and the first feature vector being different than the second feature vectors and the representative vector.

An adaptive updating apparatus of an enrollment database, the adaptive updating apparatus comprising:

• a memory storing computer-readable instructions;
• and
• one or more processors configured to execute the computer-readable instructions such that the one or more processors is configured to cause the adaptive updating apparatus to,
• authenticate an input image based on the enrollment database,
• determine whether the input image is an outlier based on a representative vector, the representative vector representing enrollment images in the enrollment database,
• determine, in response to determining the input image is not an outlier, whether a feature range of the enrollment database is increased based on a first feature vector of the input image and second feature vectors of the enrollment images, the first feature vector being different than the second feature vectors and the representative vector, and
• adaptively update the enrollment database based on a result of the determining whether the feature range of the enrollment database is increase.