Instructions

U.are.U SDK - Developer Guide 83
Glossary
4 Making the match/non-match decision.
Verification Threshold
The maximum degree of dissimilarity that is allowed between a fingerprint image and a fingerprint template in order to
make the match decision during the verification process.
Match decision or match
A decision that two fingerprints are from the same finger (meet the verification threshold).
Non-match decision or non-match
A decision that two fingerprints are not from the same finger (do not meet the verification threshold).
Identification
The process of
1 Capturing a fingerprint image from an individual,
2 Extracting fingerprint features and
3 Comparing the captured image’s fingerprint features with the fingerprint templates from multiple individuals in
order to create a candidate list of fingerprints that meet the identification threshold.
Identification Threshold
The maximum degree of dissimilarity that is allowed between a fingerprint image and a fingerprint template in order to
call the fingerprint template a candidate in the identification process.
Candidate
A fingerprint template that is determined to be similar to a given FMD during identification.
Recognition Accuracy
The terminology below is used when discussing testing processes and reporting accuracy for fingerprint-enabled
applications.
Genuine verification attempt
An attempt to compare fingerprint features with a fingerprint template where the fingerprint features and fingerprint
template are from the same individual, and the fingerprint features and fingerprint template were captured at different
times (recommended at least 2-3 weeks apart).
Impostor verification attempt
An attempt to compare fingerprint features with a fingerprint template, where the fingerprint features and fingerprint
template are from two different people.
False match rate (FMR)
The ratio between the number of impostor verification attempts that produced a match decision and the total number of
impostor verification attempts. See also FAR.
False non-match rate (FNMR)
The ratio between the number of genuine verification attempts that produced a non-match decision and the total
number of genuine verification attempts. See also FRR.
False Accept Rate (FAR)
The application-specific measure of how often the application falsely grants a request.
In authentication applications, FAR is used in place of FMR.
False Reject Rate (FRR)
The application-specific measure of how often the application falsely rejects a request.