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Face Recognition System design and costing
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The measure
of man
"Biometric" technology, which can recognise people from
their fingerprints, eyes or other bodily characteristics, is becoming
cheaper and more powerful. Is it about to become ubiquitous?
Being digital
Biometrics come in many forms. The idea is said to date back to ancient
Egypt, when records of distinguishing features and bodily measurements
were used to make sure that people were who they claimed to be. Modern
computer based biometric systems are employed for identification
("who is this person?"), in which a subject's identity is
determined by comparing a measured biometric against a database of
stored records a one to many comparison.
An eye for an eye
Another biometric is facial recognition, a technology that has gained
ground in recent years thanks to the falling price of computer power. It
works by analysing a video image or photograph and identifying the
positions of several dozen fixed "nodal points" on a person's
face. These nodal points, mostly between the forehead and the upper lip,
are unaffected by expression or the presence of facial hair, says Joseph
Atick of Visionics, a leading vendor of face recognition technology
based in New Jersey. Facial recognition is becoming more widespread,
says Dr Atick, because it can exploit existing cameras and existing
databases of facial images from driving licences and passports.
Facial recognition is used mainly to verify identity. But if the
database of possible matches is kept small, it can be used for
identification. Unlike other biometrics, facial recognition can also
operate "passively" i.e., without people realising they are
being scanned. It can thus help to spot terrorists at airports, football
hooligans at ports, and cheats at casinos. Visionics' FaceIt system was
also used to combat vote rigging in Mexico, by analysing the database of
images from voter registration cards and identifying duplicates where
the same person had registered under several different names. A list of
invalid cards was drawn up to prevent multiple voting. Similar schemes
have been used in some American states to identify people making
multiple applications for driving licences or welfare payments.
Searching for the killer app
…
Dr Atick, a proponent of face recognition systems, has also welcomed the
first prototype mobile phones and personal organisers with tiny built in
cameras. As it becomes possible to conduct transactions from mobile
devices, he argues, it will become increasingly important to be able to
verify the identity of the user of a particular device. "I think
this is the killer app," he says.
…
The biometrics industry has done its best to allay these privacy
concerns. In many applications, the spectre of an Orwellian central
database can be avoided if users carry their own biometrics around on
smart cards, as they do with INSPASS. Only if the biometric stored on
the card matches the user's handprint is access granted. Similarly, with
face recognition systems, verifying an identity can be done by comparing
the photograph in a passport with the face of its bearer; there is no
need for a database.
Besides, the nightmare vision of vast computers, correlating biometric
scans to monitor citizens' activities, assumes a level of technical
expertise on the part of governments that is lacking in the real world.
John Woodward, a legal consultant who specialises in biometrics, has
coined the term "biometric balkanisation" to describe the
inability of biometric systems from different vendors to talk to each
other something that, he argues, serves to protect privacy.
…
Scanning the future
…
Biometrics are sure to grow in importance for both governments and
companies. In welfare offices, prisons, high security facilities or when
providing access control to networks, the technology can be imposed on
users, the security of the entire system is under central control, and
the biometric scanners are used by many people, spreading their costs.
But the outlook for voluntary adoption of biometrics by consumers is
less rosy. In some fields, such as airports or banking, customers may
volunteer to use them if they can see a tangible benefit such as faster
service, lower charges, or points in a loyalty scheme. Systems that
allow consumers to opt in will do much to dispel some of the myths
surrounding the technology, and could prepare the ground for wider use.
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