Sagem Securite MorphoAccess J-Bio, User Manual

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DOCUMENT SSE-0000077399-01 - V
ERSION
1.0 - M
AY
2010 63
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– User Guide Setting up matching threshold
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2. Setting up matching threshold
The performances of a biometric system are characterized by two quantities,
the False Non Match Rate - FNMR - (also called False Reject Rate) and the
False Match Rate - FMR - (also called False Acceptance Rate). Both values are
linked. Different trade-offs are possible between FNMR and FMR depending
on the security level targeted by the Central Security Controller. When
convenience is the most important factor, the FNMR must be low and
conversely if security is more important then the FMR has to be minimized.
Different tunings are proposed in the MorphoAccess
®
depending on the
security level targeted by the system. The table below details the different
possibilities.
This parameter can be set to values from 1 to 10. This parameter specifies how
tight the matching threshold is. Threshold scoring values are identified
hereafter:
Setting up matching threshold
bio/bio ctrl/matching th 3 (1-10)
1 Very few persons rejected FMR < 1%
2 FMR < 0.3%
3 Recommended value FMR < 0.1%
(Default value)
4 FMR < 0.03%
5 Intermediate threshold FMR < 0.01%
6 FMR < 0.001%
7 FMR < 0.0001%
8 FMR < 0.00001%
9 Very high threshold
(few false acceptances).
Secure application FMR < 0.0000001%
10 High threshold for test purpose only
There are very little false
recognition, and many
rejections.