A-6
Maximus Reference Manual
MANU-MAXIMUS-02
Revision-02
How it Works
Appendix A: Biometrics
How it Works
At enrollment, the biometric reader scans the user’s fingerprint and creates a numeric data
template from the fingerprint image. Once it creates the template it discards the fingerprint
image/scan. Templates are used for comparison to live fingerscans and are either stored at the
terminal or on a host. Templates stored on a host can be distributed to additional terminals.
When a person places his or her finger on the sensor the reader captures an image of the
fingerprint. From this point the reader finds unique patterns within the fingerprint. The
starting point of this is the fingerprint core. A fingerprint core is a point located within the
inner most re-curving ridge. Normally it is located in the middle of the fingerprint as shown in
Figure A-1
Location of Fingerprint Core
Most frequent types of cores are:
•
Arches (plain and tented)
•
Loops (singular and twinned)
•
Whorl and Central Pocket Loop
The reader also looks for points within the image such as a “Y” split or an end-point as shown
in
.
