Closed-set identification is
|“||a biometric task where an unidentified individual is known to be in the database and the system attempts to determine his/her identity. Performance is measured by the frequency with which the biometric subject appears in the system's top rank (or top 5, 10, etc.).||”|
- ↑ Biometrics Identity Management Agency, Biometrics Glossary, at 17 (Ver. 5) (Oct. 2010) (full-text).