Installation & Operation Guide Page 18 of 48
Introduction to Fingerprint Recognition Technology
User Identification/Verification
This is the process of comparing a user's finger against the stored map, and/or verifying a user from a stored password
number. After performing the verification process the system will indicate success or failure while also storing all verified
punches for transfer to the Time Guardian software.
Threshold
The threshold is a predefined number, often controlled by the administrator, which establishes the degree of correlation
necessary for a successful match. If the score from the template comparison exceeds the threshold, the templates are
considered a match. The threshold establishes a balance between False Acceptance Rate (FAR) and False Rejection
Rate (FRR). FAR indicates the probability that a biometric system will incorrectly identify an individual or will fail to reject
an imposter.
You can set the threshold for all users. For a user who has a difficult fingerprint verification, it is recommended to use ID &
fingerprint verification (match one-to-one). Raising the threshold increases security, while lowering it increases the
passing ratio. The correct balance can be vital. For example, a user whose finger is worn or injured should have a
reduced threshold.
The FAR and FRR values affect each other. As FAR is increased, FRR should be decreased. The default one-to-many
threshold is 35, while the 1:1 matching default threshold is 15 (see the following table).
Table 0-1 Recommended Threshold Level Settings
Priviledge (Status) Levels
The status levels define the ability of a user to perform specified administrator and other tasks including the ability to view,
edit, add, and renew specified information categories. Two status levels can be assigned at the MTX-30 terminal or from
Time Guardian, and modified as required. These two levels are:
User – person whose identity must be verified to punch and have their attendance recorded in Time Guardian. Cannot
perform any administrator functions.
Administrator – person who has access to all functions, including system setup..
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