® Norman Poh Hoon Thian What is Biometric Authentication? A process of verifying an identity claim using a person’s behavioral and physiological characteristics. [Jain, 1999]

® Norman Poh Hoon Thian Scores A Generic Biometric Authentication Architecture SensorsExtractors Image- and signal- pro. algo. Biometrics Voice, signature acoustics, face, fingerprint, iris, hand geometry, etc Data Rep. 1D (wav), 2D (bmp, tiff, png) Feature Vectors Feature Fusion Decision Fusion ExpertsCombination Mechanism Threshold Data Fusion Decision: Match, Non-match, Inconclusive Person [Poh and Korczak, 2001]

® Norman Poh Hoon Thian Different ways to improve BA Multi-classifier Multi-Extractor Multi-virtual sensor Multi-modal Multi-sample [Kittler et al., 2001] [Dietterich and Bakiri, 1995] [Marcel and Bengio, 2001] [Poh and Korczak, 2001] [Jain et al., 1999] A bibliographic survey

® Norman Poh Hoon Thian Performance Evaluation Optimal threshold Sub-optimal threshold False accept False reject P(y | impostor|) score P(y | client) Likelihood

® Norman Poh Hoon Thian ROC and DET Evaluation Curves Courtesy of Johnny Mariethoz and Samy Bengio