FAQ
Question: Sometimes, it is necessary to put the finger 3 or 4 times on the reader until the person is recognized, how can that be solved?
Answer:
There are the function GrSetVerifyParameters and GrSetIdentifyParameters
for verification and identification respectively. Both of them expect as
parameters the following integer values:
identifyThreshold The identification score threshold.
identifyRotationTolerance The rotation tolerance for the identification
process.
context Context in which the identification parameters will be set.
In order to reduce false avoidance , you can adjust identifyThreshold
and identifyRotationTolerance , specially identifyThreshold. As
fingerprints are different in each database, we can't give you a specif
number but 30 is a identifyThreshold parameter that usually causes only
1 false rejection in 1000.
We also recommend the storage of at least 3 fingerprints , this prevents that the stored fingerprint was not read properly.
