Biometric eye authentication using adaptive decision thresholds and/or normalizing distances

Abstract

Methods for performing user authentication based on a similarity scoring technique for devices, such as head-mounted display devices, are disclosed. An image may be captured of an eye and may then be transformed into an iris feature representation. A similarity scoring technique may be determined based on discrimination factors of the iris feature representation and/or discrimination factors of one or more reference iris feature representations associated with a user identifier (ID). The similarity scoring technique may produce a similarity score based on applying a selected or modified scoring algorithm to the iris feature representation and the one or more reference iris feature representations. The similarity score may be compared to a threshold to provide an indication of whether the respective representations constitute a match. An authentication operation based on the user ID and the indication may be performed.