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IRIS RECOGNITIONTECHNOLOGY
SRI PRAKASH COLLEGE OF TECHNOLOGY
R.SURESH III-IT
T.K.CHAITANYA III-IT
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THE IRIS
Iris is the area of the eye where the pigmentedor colored circle, usually brown, blue, rings the
dark pupil of the eye.
Normal Eye Example of iris
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The IRIS
Iris is the thin membrane on the interior of the eyeball.
Iris pattern remains unchanged after the age of two and
does not degrade overtime or with the environment.
Iris patterns are extremely complex than other biometricpatterns.
The details of each iris are phenotypically unique, that is,
no two are exactly alike, not even among twins, not even in
your own two eyes.
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Individuality of Iris
Left and right eye irises have distinctive pattern.
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Techniques used
Iris Localization
Iris Normalization
Image Enhancement
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Iris Localization
Both the inner boundary and the outer boundary of a typical iris
can be taken as circles. But the two circles are usually not co-
centric. Compared with the other part of the eye, the pupil is
much darker.
First we detect the inner boundary between the pupil and the iris.
The outer boundary of the iris is more difficult to detect because
of the low contrast between the two sides of the boundary.
So we detect the outer boundary by maximizing changes of the
perimeter- normalized along the circle. The technique is found to
be efficient and effective.
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Iris Normalization
The size of the pupil may change due to the variationof the illumination and the associated elasticdeformations in the iris texture may interface with theresults of pattern matching.
For the purpose of accurate texture analysis, it isnecessary to compensate this deformation.
Since both the inner and outer boundaries of the iris
have been detected, it is easy to map the iris ring to arectangular block of texture of a fixed size.
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Image Enhancement
Theoriginal image has low contrast and may
have non-uniform illumination caused by the
position of the light source. These may impair
the result of the texture analysis. We enhance
the iris image reduce the effect of non-uniform
illumination.
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Iris preprocessing: (a) original eye (b) iris localization
( c ) iris normalization (d) image enhancement
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10
Iris Recognition System
LocalizationAcquisition
IrisCode Gabor Filters Polar Representation
Image
Demarcated Zones
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Iris Recognition systems
The iris-scan process begins with a photograph.A specialized camera, typically very close to thesubject, not more than three feet, uses an
infrared imager to illuminate the eye andcapture a very high-resolution photograph.This process takes 1 to 2 seconds.
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Creating an Iris code The picture of the eye is first processed by a
software that localizes the inner and outer
boundaries of the iris. Then it is encoded by some image-
processing technologies.
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Iris recognition
In less than few seconds, even on a database of
millions of records, the iris code templategenerated from a live image is compared to
previously enrolled ones to see if it matches to
any of them.
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Advantages:
Comparison Of Iris Recognition With Other Biometrics:
Accurate
Stability
Fast
Scalable
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Comparison between biometrics..
Method Coded Pattern
Mis-
Identification
rateSecurity
Applications
Iris Iris pattern1/1,200,00
0High high-security
Fingerprint fingerprints
1/1,000Medium
Universal
voice
Signature
Face
Palm
Voice
characteristics 1/30Low
Low
Low
Low
Telephone service
Low-security
Low-security
Low-security
1/100
1/100
1/700
Shape of letters, writing
Order, pen pressure
Outline, shape &
distribution of eyes, nose
size, length, & thickness
hands
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Advantages..
Does not require intimate contact with the reader.
High accuracy in identifying users. Chances of a false positive are very
low.
Low data storage requirements for template.
Convenient for people who wear glasses.
Left and right iris patterns of a certain person are different, including
those of identical twins.
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Disadvantages..
The position of the eye can be problematic
some times.
Requires specialized devices, so it can be
expensive.
When the person expires or looses his or
her eyes the accessing of accounts {banks,
emails etc.} will be impossible.
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Applications
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March 10, 2004 19
Imaging Systems
http://www.iridiantech.com/
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QUERIES..?
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