US Patent 7844082 Method and system for biometric authentication

A method for authentication by biometric data, including receiving a biometric data set; evaluating if the received biometric data set is within a reference region, wherein the reference region represents a region associated with a reference biometric data set; evaluating if the received biometric data set is within a blackout region, wherein the blackout region represents a region associated with at least one previously received and positively authenticated biometric data set; and issuing a positive authentication if the received biometric data set is within the reference region, but outside the blackout region.