2.0. Fingerprint Scanner
BioCARDKey is built around the TouchChip Silicon fingerprint sensor. It is a fast, reliable and
inexpensive fingerprint peripheral, which can be used to authenticate users of computers and all kinds
of information technology devices.
The TouchChip device is suitable for applications such as desktop access control, network security,
Internet-based applications and commercial verification and identification systems. It contains all the
necessary biometric components: fingerprint sensing, image optimization and matching. Application
Programming Interface (API) is also provided for easy integration into applications and to save a lot of
development time. (Please refer to Programmer’s Guide for more information on API.)
TouchChip active capacitive sensing provides a much higher immunity to parasitic effects leading to a
higher signal-to-noise ratio and the ability to capture a wider range of fingerprints than competing
technologies, such as passive capacitive sensing.
Typically there are two processes involved in a biometric application:
1. Enrollment:
Before the identity of an individual can be verified via his/her fingerprints, it is necessary to
capture one or several fingerprint samples. This process is called enrollment. The samples
are referred to as fingerprint templates and can be stored on a broad range of media such as
computer storage devices or smart cards.
2. Verification:
The verification process requires a user to verify his identity by placing his finger on the
fingerprint scanner sensor. The live fingerprint is compared with a stored template using a
matching algorithm in order to determine whether they represent the same set of fingerprints.
The matching result is then made available to the computer.
When using the fingerprint device, the security level is mainly governed by two parameters:
1. False Acceptance Rate (FAR):
FAR is the probability that a false sample matches with the original template previously
extracted from the subject’s fingerprint images during enrollment.
2. False Rejection Rate (FRR):
FRR is the rate at which the system incorrectly rejects a legitimate attempt to verify.
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AET60 Reference Manual
Version 1.7
Page 4 of 24
www.acs.com.hk
