©2011, Attendance on Demand
®
, Inc. Information in this document is subject to change without notice.
12
Working with the Biometric Reader
Employees can use a finger to punch In/Out on the time clock. This section describes biometric
technology, how to enroll a finger correctly, and how to punch In/Out.
Understanding Biometric Technology and Enrollment
All fingers contain a number of unique physical characteristics called minutiae which include certain
visible aspects of fingerprints such as ridges, ridge endings, and bifurcation (forking) of ridges. Most of
the minutiae are found in the core point of fingerprints. A core point is the topmost point on the innermost
upward ridge line. The quality of finger image is relative to the number of minutiae points captured.
Please note
: The IDpunch 7 Finger Reader does not store or read finger prints. It uses the physical
characteristics of the finger to create a unique template to store and compare when an employee punches.
To ensure a smooth finger enrollment process, consider the factors influencing finger enrollment and
follow the rules listed here.
Finger selection
. Use index, middle or ring fingers with good core points. Avoid using thumb and
little fingers since they are awkward to consistently position on the sensor. Good core points are
found near the center of the finger on the fleshy pad.
Good core point
Bad core point
Finger position
. Always place the finger in the center of the sensor reader to ensure consistent finger
positioning. If the scanned minutiae remain consistent whenever an individual punches, the finger
image is successfully matched to the pre-existing template. Placing the finger far from the center of
the sensor reader increases the rejection rate.
Finger area
. Maximize the surface area of the finger to capture the most minutiae.
Correct placement
