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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.
Table 1—1 Suggested Threshold Settings
FRR FAR One-to-many One-to-one
High Low 45 25
Middle Middle 35 15
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