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Using the Enrollment Station
The following instructions walk you through understanding how the
enrollment process works, and lead you step-by-step through creating
finger templates.
Enrolling Legible Finger Templates
The following topic is intended to give you a basic knowledge of finger
enrollment process.
How it Works
When the Enrollment Station or a biometric time clock attempts to read
a finger, it senses on an array of 160 by 160 “dots” how close to the sur-
face of the sensor the skin is. Then, it senses finger “ridges” as being
very close (actually contacting the sensor), while the “valleys” in the
finger register as being further away.
Because of the way the sensor takes the distance measurement, the skin
must contain moisture. For this reason, the clock would not read a rub-
ber finger molded from a real finger. This is also the reason why excep-
tionally dry fingers or very dirty fingers will cause unreadable tem-
plates.
The presence of a finger on the sensor is detected by the contrast seen by
the sensor between the close and “distant” portions of the finger. Thus, a
completely smooth finger would not be detected, no matter how well
cleaned or moisturized it was. The biometric unit also looks for the swirl
pattern in the center of the finger, so if the finger is placed on the sensor
so that the center of the fingertip is not near the center of the sensor, no
finger will likely be detected, and no match will occur.
Note:
A finger template is generated using a mathematical algorithm.
No image of the employee's fingerprint is generated or saved by the sys-
tem during the process of enrolling a template.
Summary of Contents for ETC 100
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