User's Manual

S
S
E
E
T
T
T
T
I
I
N
N
G
G
U
U
P
P
M
M
A
A
T
T
C
C
H
H
I
I
N
N
G
G
P
P
A
A
R
R
A
A
M
M
E
E
T
T
E
E
R
R
S
S
Setting up matching threshold
bio/bio ctrl/matching th
1-10
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). Different trade-off are possible between FNMR and FMR depending
on the security level targeted by the access control system. 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 tuning are proposed in the MorphoAccess terminal 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
1 Very few persons rejected FAR < 1%
2 FAR < 0.3%
3 Recommended value
(default value)
FAR < 0.1%
4 FAR < 0.03%
5 Intermediate threshold FAR < 0.01%
6 FAR < 0.001%
7 FAR < 0.0001%
8 FAR < 0.00001%
9 Very high threshold (few false
acceptances) Secure
application
FAR < 0.0000001%
10 High threshold for test purpose
only
There are very few false
recognitions, and many rejections
32 SAGEM Défense Sécurité document. Reproduction and disclosure forbidden