DAT 628 Guia do Utilizador descarregar pdf (Página 8)

Note: Security issues should never be a concern when using the

A10/X628. No real image of the user’s fingerprint(s) is stored in the

device. Only the minutiae-based templates are stored.

B. Getting Good Fingerprint Images

The quality of fingerprint images is comparable to the amount of minutiae

points acquired by the A10/X628 sensor. Fingerprint images that do not

possess a sufficient number of minutiae points may be indecipherable. We

advise those users whose fingerprint images cannot be read by the sensor

to create a password.

Below in Figure A-2 shows examples of inadequate fingerprints. These

are examples of smudged, faded or distorted areas on the fingerprint.

These conditions are incurred by excessive dryness, wetness, insufficient

pressure or scarring of the skin at the fingertip.

Figure A-2

The fingerprint matching algorithm is capable of extracting the correct

minutiae without visibly seeing a perfect print. However, the positioning

of the finger, the moisture and pressure is imperative when placing it on

the sensor. These are major contributing factors in achieving a consistent

fingerprint match.

C. Correcting Wet/Dry Fingerprint(s) Images

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DAT 628 Guia do Utilizador Página 8