Biometric authentication system, biometric authentication method, and recording medium

摘要

A biometric authentication system (1) records, in a storage unit in an associating manner, position information of a feature area on an image of biometric information whose biometric authentication is successful and reference biometric information referred to in the successful biometric authentication, the feature area being specific to a living-body, and detects a feature area that is specific to a living-body from an image of biometric information of an input object to be authenticated, and narrows down the reference biometric information stored in the storage unit to reference biometric information to be compared with the biometric information of the object to be authenticated, based on the degree of similarity between each position information, and authenticates the biometric information of the object to be authenticated by comparing the reference biometric information obtained as a narrowing-down result and the biometric information of the object to be authenticated.

主权项

1. A biometric authentication system comprising:
a memory; and a processor coupled to the memory, wherein the processor executes a process including: storing, in the memory in an associating manner, a form of distribution formed by collection of position information of a feature area on an image of biometric information whose biometric authentication is successful and reference biometric information referred to in the successful biometric authentication, the feature area being specific to a living-body; detecting a feature area that is specific to a living-body from an image of biometric information of an input object to be authenticated; first calculating a first degree of similarity between a form of distribution formed by collection of the position information of the feature area detected at the detecting and the form of the distribution formed by the collection of the position information of the reference biometric information stored in the memory; second calculating, in an area other than the feature area detected at the detecting, a second degree of similarity between a feature quantity of the biometric information of the object to be authenticated and a feature quantity of the reference biometric information stored in the memory; third calculating a third degree of similarity based on the first degree of similarity and the second degree of similarity; narrowing down the reference biometric information stored in the memory to reference biometric information having the third degree of similarity that is not less than a predetermined threshold as reference biometric information to be compared with the biometric information of the object to be authenticated; and authenticating the biometric information of the object to be authenticated by comparing the reference biometric information obtained as a narrowing-down result at the narrowing down and the biometric information of the object to be authenticated.