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Appendix
Centering the Core
In some cases, if the core of the fingerprint is not visible in the image on the screen, the software may
incorrectly reject a registered user. In this case, simply lift the finger and replace it on the sensor with
the core more closely centered on the sensor. The matching process should then be performed correctly.
During enrollment, you will be asked to lift and replace your finger on the sensor several times. The
performance of the matcher can be improved by taking care to place the finger in slightly different
locations on the sensor for each one of the enrollment placements. This gives the matcher the opportu-
nity to create a composite image of the finger, including more area than can be seen in a single view.
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