Instructions

U.are.U SDK - Developer Guide 84
Glossary
In authentication applications, FRR is used in place of FNMR.
Verification Detection Error Trade-off (DET) curve
A parametric curve that plots FMR on the x-axis and FNMR on the y-axis as a function of the verification threshold.
Probe
In simulation tests, a fingerprint used in searches (analogous to the user fingerprint used by a real application for
searching).
Gallery
In simulation tests, a set of enrolled fingerprints (fingerprint templates) used for comparison purposes (analogous to
the database of enrolled fingerprint templates used by a real application).
Open set identification attempt
For the purpose of testing, an attempt to compare a probe against a gallery that does not contain any impressions from
any finger of the individual whose finger was used as the probe.
Closed set identification attempt
For the purpose of testing, an attempt to compare a probe against a gallery, where the gallery includes a fingerprint
template from the same finger (from the same person) as used for the probe. The probe and the corresponding
fingerprint template should be captured at different times (recommended at least 2-3 weeks apart).
False positive identification rate (FPIR)
Proportion of identification requests that return a candidate even though the person is not enrolled.
More precisely, for the purpose of recognition accuracy testing, the ratio between the number of open set identification
attempts that returned one or more candidates and the total number of open set identification attempts.
False negative identification rate (FNIR)
Proportion of identification requests by enrollees that do not return the correct candidate.
More precisely, for the purpose of recognition accuracy testing, the ratio between the number of closed set
identification attempts that did not return the correct candidate and the total number of closed set identification
attempts.
Identification detection error trade-off (DET) curve
A parametric curve that plots FPIR on the x-axis and FNIR on the y-axis as a function of the identification threshold.
The Identification DET curve depends on the gallery size. Typically, multiple identification DET curves are shown on
the same plot, one for each gallery size.