iGuard FPS110
P.5
A NOTE ON FINGERPRINT IMAGE
iGuard incorporates the advanced DFX (Difficult Fingerprint Extraction) technology
(originally developed by Bell Labs USA), and works very well with most people’s
fingerprint images, and iGuard can achieve a very low false-reject-rate (1%).
However, as individuals, our hands have different levels of moisture. In some cases,
iGuard may have difficulty in recognizing people’s fingerprint, especially for the
people with very dry skin. The problem is more noticeable during the enrollment
process, where the product requires a more accurate and higher quality fingerprint
image than the normal verification process. The easiest way to get around with this
problem is to apply a very small amount of skin moisturizing lotion to the thumbs
during the enrollment process. In most cases, this extra step is only required during
the enrollment process, and is not necessary in the daily verification process.
Hints for Capturing Fingerprint Images
Place your thumb flat on the fingerprint sensor using the pad, not the tip, of your
thumb. The tip of the thumb contains the fewest minutia points, so place the thumb
as flat as possible on the sensor to generate the fullest possible image.
The Core
The Tip
The core of the fingerprint containing the most minutia points is typically located
opposite the cuticle. Center the cuticle in the sensor window to maximize the number
of minutia points.
The fingerprint sensor shutter
There is a shutter that covers the fingerprint sensor, which serves to protect the
surface of the sensor. When you lift the shutter with your thumb, make sure to lift it
all the way up to the top. It is because the device has a sensor that senses the
position of the shutter, and the device won’t start capturing the fingerprint until the
shutter is lifted all the way up.
Note
: it may take some practices to align the core of
the fingerprint to the center of the sensor while lifting the shutter up.
