Fingerprint scanners have become more common for security and access. They work by capturing an image of a fingerprint's unique ridge and valley patterns using either optical or capacitive sensors. The scanner then analyzes and compares these minutiae points to fingerprints stored in its database to authenticate identity. While fingerprint authentication has advantages over traditional passwords, there are also privacy concerns since fingerprints cannot be changed if compromised.

1. How Fingerprint Scanners Work
Computerized fingerprint scanners have been
mainstay of spy thrillers for decades, until
recently, they were very exotic technology in the
real world. In recent years, the scanner has begun
in many places. Instead of the computer is
protected by a high-tech biometrics, in addition to
a password to gain access you need a unique
print. The fingerprint scanner security system,
look at how the password and ID cards stacked in
a conventional system, find a way to fail.

2. Fingerprint Basics
Fingerprint is one of those bizarre twists of nature.
Human ID card for easy access, because of the
built-in occur. Literally at your fingertips, a unique
design that represents you alone, have. This
particular adaptation, because the people were
very beneficial to the ancestors of human beings
have a small bump on the skin of their fingers.
Pattern of ridges and finger "valleys" in the same
way, the rubber tread pattern helps a tire grip the
road surface can be easily carried in your hand to
the grip.

3. Optical Scanner
It needs to get a picture of your fingers, and it is
necessary to determine whether it matches the
pattern of valleys and ridges of the scanned
image in advance the pattern of valleys and
ridges of this image - Scanner system fingerprint
there are two basic jobs. There are many ways to
get a picture of someone's finger. The most
common methods today are optical scanning and
capacitance scanning. The heart of the optical
scanner, a charge coupled device (CCD), an
optical sensor system is the same as those used
in digital cameras and camcorders.

4. Capacitance Scanner
Similar to optical scanners, capacitive fingerprint
scanners to produce images that make up the
fingerprint ridges and valleys. When you print
using light sensing Instead, use the capacitor
current. The sensor is composed of one or more
semiconductor chips containing an array of tiny
cells. The sensor, integrator, and is connected to
an electrical circuit that is built around an inverting
op amp. As with any amplifier, inverting amplifier
based on a different variation of the current to
change the current ones.

5. Analysis
Most fingerprint scanner system, fingerprint called
minutiae in general, to compare specific
characteristics. In general, human-computer
scientists to focus on the point where one ridge
splits in two lines and the edge of the ridge.
Collectively, these and other features are
sometimes called Tipika. The scanner system
software to recognize these characteristic points,
we use very complex algorithms to analyze. The
basic idea is the same type and how you might
recognize the relative position of stars in the sky
part is to measure the relative positions of feature
points.

6. Pros and Cons
Past "you have" to get the system, such as an ID
card with magnetic stripe "tokens," must be
certain. "You know" the system, you must enter a
password or PIN number. Systems such as
fingerprint scanners, there are a number of
advantages compared to other systems. Physical
attributes are much harder to fake than identity
cards. It is not possible to infer the pattern of the
fingerprint. Fingerprint, iris and voice can not
forget it. You can not forget your fingerprint.