Terms and definitions (O)

ABCDFILMNOPRSTVU

Observer
Staff member who records test data or supervises the group.

Offline
Test mode in which registration and comparison are performed separately from the process of presenting an image or signal.

Online
Test mode in which registration and comparison are performed while presenting an image or signal.

One-to-many comparison; excluded «one-to-few»
A process in which the biometric sample(s) of one subject of biometric data is compared with a biometric control template of more than one subject of biometric data to obtain a set of comparison results.

One-to-many search
The process in which a biometric sample (biometric samples) of one subject of biometric data is searched for by a biometric control template, of more than one subject of biometric data in order to return a list of candidates or a decision to compare.

One-to-one comparison
The process in which the biometric sample (s) of one subject of biometric data is compared with the biometric control template (s) of one subject of biometric data to obtain a comparison result.

Open-set identification
Identification in which some users are not registered in the system.

Operator
A person working with a real system.

Operational evaluation
A test in which the performance of a biometric system is determined under specific operating conditions from a specific target sample.