- Classifier Combination. Encyclopedia of Biometrics 2009: 181
- Classifier Fusion. Encyclopedia of Biometrics 2009: 181
- Classifier Selection. Encyclopedia of Biometrics 2009: 181
- CLEAR. Encyclopedia of Biometrics 2009: 182
- Client. Encyclopedia of Biometrics 2009: 182
- Closed-Set Identification. Encyclopedia of Biometrics 2009: 182
- CMOS Sensor. Encyclopedia of Biometrics 2009: 182
- Color Constancy. Encyclopedia of Biometrics 2009: 182
- Commensurability. Encyclopedia of Biometrics 2009: 182
- Committee-Based Learning. Encyclopedia of Biometrics 2009: 182
- Common Feature Approach. Encyclopedia of Biometrics 2009: 189
- Comparison. Encyclopedia of Biometrics 2009: 190
- Comparison Prints. Encyclopedia of Biometrics 2009: 190
- Complementary Metal Oxide Semiconductor (CMOS). Encyclopedia of Biometrics 2009: 190
- Compliance. Encyclopedia of Biometrics 2009: 190
- Computational Iris Recognition Systems. Encyclopedia of Biometrics 2009: 190
- Concept Drift. Encyclopedia of Biometrics 2009: 190
- Confidence Interval. Encyclopedia of Biometrics 2009: 190
- Configural Processing. Encyclopedia of Biometrics 2009: 190
- Conformance Testing. Encyclopedia of Biometrics 2009: 197
- Conformity. Encyclopedia of Biometrics 2009: 202
- Contact Microphones. Encyclopedia of Biometrics 2009: 202
- Contact-Based. Encyclopedia of Biometrics 2009: 202
- Contactless. Encyclopedia of Biometrics 2009: 202
- Contextual Biases. Encyclopedia of Biometrics 2009: 202
- Continuous Classification. Encyclopedia of Biometrics 2009: 202
- Contour Detection. Encyclopedia of Biometrics 2009: 202
- Contrast. Encyclopedia of Biometrics 2009: 202
- Convenience Sample. Encyclopedia of Biometrics 2009: 203
- Convergence Feature Extraction. Encyclopedia of Biometrics 2009: 203