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Option
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Threshold - A predefined number, often controlled by a biometric
system administrator, which establishes the degree of correlation
necessary for a comparison to be deemed a match. If the score resulting
from template comparison exceeds the threshold, the templates are a
“match” (though the templates themselves are not identical).
The Threshold establishes a balance between False Acceptance Rate
(FAR) and False Rejection Rate (FRR). FAR mean the probability that a
biometric system will incorrectly identify an individual or will fail to
reject an impostor. The rate given normally assumes, FRR measure the
probability that a biometric system will fail to identify an enrolee, or
verify the legitimate claimed identity of an enrolee.
You can set the threshold to all users. For a user who’s the
fingerprint verification is difficult, you can adopt ID & Fingerprint
verification (match one to one).
Raising the threshold increases security, while lowering it increases
pass. The correct balance is vital.
For a user whose finger is worn or injured, the threshold should be
reduced.
Notice: FAR and FRR affect each other, if increases FAR then
reduce FRR. The default Threshold is 35, 1:1 matching Threshold is 15.
System info
3.1.3 Threshold
Maintained
Concepts
One-to-many
One-to-one
High
Low
45
25
Middle
Middle
35
15
Low
High
25
10
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Help
FAR
Trouble
FRR
T&A Program
Table 1—1 Suggested Threshold Settings