- Ridge Enhancement. Encyclopedia of Biometrics 2009: 1130
- Ridge Extraction. Encyclopedia of Biometrics 2009: 1130
- Ridge Flow. Encyclopedia of Biometrics 2009: 1130
- Robustness Test. Encyclopedia of Biometrics 2009: 1131
- ROC Curve. Encyclopedia of Biometrics 2009: 1131
- Rolled-Equivalent Fingerprint. Encyclopedia of Biometrics 2009: 1131
- Rolls Capture Device. Encyclopedia of Biometrics 2009: 1131
- Rotation Angle. Encyclopedia of Biometrics 2009: 1131