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Getting Good Fingerprint Images
The quality of fingerprint images is relative to the number of minutiae
points captured by the F707/708’s sensor. Fingerprint images not
possessing an adequate number of minutiae points may be unreadable.
For those users whose fingerprint images lack sufficient minutia points
and cannot be read by the sensor, it’s advised to issue those few users a
secret password, instead. You may also consider purchasing an F707/708
with an integrated card reader, if you prefer not assigning passwords.
Figure A-2 shows poor-quality fingerprints, characterized by smudged,
faded or otherwise distorted areas on the fingerprint. These conditions can
be caused by excessive dryness or wetness, excessive or insufficient
pressure, or scarring of the skin at the fingertip.
Figure A-2
The F707/708 fingerprint matching algorithm is often capable of
extracting the correct minutiae even without the benefit of a perfect print.
However, the positioning of the finger and the relative moisture and
pressure of the fingerprint when it is placed on the sensor are important
contributing factors in achieving a good consistent fingerprint match.
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