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Automatically verifying the identity of a person by means of biometrics (e.g., face and fingerprint) is an important application in peoples' day-to-day activities such as accessing banking services and security control in airports. To increase the system reliability, several biometric devices are often used. This paper considers how auxiliary information such as the quality associated with a biometric sample and the device information can be used when combining the output of several biometric devices. Since both these sources of information are not discriminative in distinguishing genuine users from impostors, combining them is indeed a challenging problem.
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