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Hand Image Identification and Finger Image Identification
Hand Geometry Identification Technology was the earliest form of
Biometric Identification Technology to enter the commercial world.
Hand Geometry Identification Technology is based on every person's
unique 3-D image and size, which within a certain time frame is
extremely stable and will not change significantly. To capture a
biometric sample, the user must place his or her hand down on the
reader's surface. The hand must then be aligned with the five pegs
to indicate the proper location of each finger. There must be three
placements in order to enroll on the unit, and the enrolment template
is a representation of the most relevant data from the three placements.
A 32,000 pixel CCD (Charged Couple Device - a semiconductor device
that reads images electronically) digital camera inside the unit
infers the length, width, thickness and surface area of the hand
and fingers from silhouetted images projected within the scanner.
Over 90 measurements are taken, and the hand and finger's characteristics
are represented as a 9 byte template.
Hand Geometry characteristics are seen as an extremely reliable
source of data which are not easily affected by outside factors,
and do not change significantly. They are also extremely convenient
to use and have been widely used in recent years. It is used in
all US military areas, in more than 90% of core power plants as
a door security system. In the 1996 Olympics it was used in the
Olympic village, where more than 65,000 user were enrolled in 28
days, and were used more than one million times.
It was then discovered the while there was no significant reduction
in accuracy and reliability when only identifying the index and
middle finger only, great improvements were made in terms of size,
cost and convenient of use, the proof of which can now be seen in
the GeoKey.
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