Patent ID: 9092652
Filing Date: 2015-07-28
Classification: G06K

Abstract:
1. A method comprising: receiving fingerprint image data associated with an authorized user by a fingerprint recognition sensor; transforming the fingerprint image data associated with the authorized user into a substantially rotationally invariant representation thereof, wherein transforming the fingerprint image data associated with the authorized user comprises determining a set of directions based on gradients defined at different points in the fingerprint image data, and determining a set of differences of the directions; maintaining the substantially rotationally invariant representation of the fingerprint image data associated with the authorized user in a database of enrolled fingerprint information; and comparing processed fingerprint image data from an accessing user with the substantially rotationally invariant representation of the fingerprint image data from the authorized user by comparing a first histogram for the set of differences based on the fingerprint image data associated with the authorized user and a second histogram for a corresponding set of differences based on the fingerprint image data from the accessing user.