DAT 628 User's Guide download pdf (Page 12)

The Match Threshold is an extensive verification process performed to

ensure that users are who they claim to be.

The Match Threshold Levels establishes a balance between False

Acceptance Rate (FAR) and False Rejection Rate (FRR). FAR measures

how often a non-authorized user is falsely recognized and granted access

to the system. FRR measures how often an enrolled and authorized user is

denied access to system because the system did not recognize them.

Note: You cannot set match threshold levels on a per user basis. The

threshold setting is universal for the user population.

If too many users are experiencing difficulty having their fingerprint(s)

read, we recommend using 1:1 matching (i.e. User first enters their User

ID, and then places their finger on the sensor for verification).

Raising the threshold increases security while lowering decreases it. You

need to strike a correct balance based upon the quality of users

fingerprints.

If too many users are experiencing difficulty fingerprint recognition, the

match threshold level can and should be reduced.

Table 1—1 Suggested Match Threshold Settings

FRR FAR One-to-many One-to-one

High Low 45 25

Middle Middle 35 15

Low High 25 10

D. User ID Numbers

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 122 123

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DAT 628 User's Guide Page 12