User's Manual

MorphoAccess® VP Series - User Guide
Section 10: MorphoAccess® Terminal Customization
85 M ORPHO DOCUMENT . R EPRODUCTION AND D ISCLOSURE P ROHIBITED SSE-0000082427-01
January 2011
Setting up matching threshold
Description
The performances of a biometric system are mainly characterized by two values:
• The False Reject Ratio (FRR) : number of wrongly rejected allowed users, divided
by the number of access requests
• The False Acceptance Ratio (FAR) : number of wrongly admitted not allowed
users, divided by the number of access requests
Both ratio values are linked. Different trade-offs are possible between FRR and FAR
depending on the security level targeted. When convenience is the most important
factor, the FAR must be low and conversely if security is more important, then the
FAR has to be minimized.
Different tunings are proposed in the MorphoAccess® terminal depending on the
security level targeted by the access control system.
Configuration key
The False Acceptance Ratio is tuned indirectly by a configuration key: the highest is
the configuration key value; the lower is the FRR value.
Setting up the matching threshold
bio/bio ctrl/matching th 3 (1-10)