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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Biometric Systems: Types

Biometric Systems: Types of Failures • False Accept Rate (FAR) / False Match Rate (FMR): – Security problem! • False Reject Rate (FRR) / False nonmatch Rate (FNR): – Usability / acceptance problem • Receiver Operating Characteristic (ROC): – curve of FAR against FRR • Equal Error Rate (EER): – rate for FAR=FRR – can be seen from the ROC curve 115

ROC Curve and Security Problems of Biometrics Liberal system: Do not exclude might-be offenders! Conservative system: Prevent break-ins! 116 Figure taken from: Anil Jain, Lin Hong, Sharath Pankanti: Biometric Identification; Communications of the ACM 43/2 (2000) 91-98 Low FMR causes high FNR and vice versa !

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