User's Manual

A PPENDIX A – Q UALITY AND C ONTENT

is not found and since all templates have been compared, the

VERIFICATION is FAILED.

NOTE: The initial finger scan takes ~0.5 seconds and each comparison

takes ~0.5 seconds. So if the first template results in a successful

verification, the total time is ~1.0 seconds. Successful verification

on the second templates requires ~1.5 seconds, and so on.

Section A.2 - Proper Finger Placement

The basics for successful operation of the Veri-Series units are simple but important.

System performance improves dramatically with consistent finger placement. It is

important to make sure that the position of the finger allows the unit to record the unique

features of the print. Here are the steps to follow for trouble-free fingerprint recognition.

• Bioscrypt has designed the Ridge-Lock to create “simple user instruction” and

“consistent” finger position. With the fingertip raised, position the finger so that

the Ridge-Lock rests comfortably within the first indentation of the finger. Next,

lower the finger onto the sensor and apply moderate pressure.

Common mistakes

Correct finger placement is a significant component for reliable fingerprint imaging.

The following list some common mistakes to avoid.

• Sliding the fingertip into place instead of lowering it onto the sensor will cause

distortion of the fingerprint and will degrade image quality. Keep the fingertip

raised while locating the Ridge-Lock, then lower the fingertip.

• Rotating the finger into position also will cause distortion of the fingerprint,

subsequently making verification less reliable.

• Positioning the finger to one side and leaving a portion of the sensor exposed will

degrade image quality.

• Placing the finger at an angle to the finger guide is another common mistake.

Rotation of the fingertip will not provide a reliable image of the fingerprint.

Image quality

Dry skin is another factor that can contribute to an unreliable image of a fingerprint. A

normal amount of moisture on the skin makes the ridges and valleys of the fingerprint

stand out to the sensor. Too little moisture makes the image “noisy” and will “cause