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
A Generic Biometric Authentication Architecture
Decision:
Person
Sensors
Extractors
Image- and signal- pro. algo.
Experts
Combination Mechanism
Threshold
Match, Non-match, Inconclusive
Biometrics
Voice, signature acoustics, face, fingerprint, iris, hand geometry, etc
Data Rep.
1D (wav), 2D (bmp, tiff, png)
Feature Vectors
Scores
Data Fusion
Feature Fusion
Decision Fusion
[Poh and Korczak, 2001]
® Norman Poh Hoon Thian
Different ways to improve BA
A bibliographic survey
Multi-classifier
Multi-modal
Multi-Extractor
Multi-sample
[Dietterich and Bakiri, 1995] [Kittler et al., 2001] [Jain et al., 1999] [Marcel and Bengio, 2001] [Poh and Korczak, 2001]
Multi-virtual sensor
® Norman Poh Hoon Thian
Performance Evaluation
Likelihood P(y | impostor|) P(y | client)
Optimal threshold
Sub-optimal threshold False reject
False accept
score
® Norman Poh Hoon Thian
ROC and DET Evaluation Curves
Courtesy of Johnny Mariethoz and Samy Bengio
® Norman Poh Hoon Thian