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lec18 Iris Recognition

lec18 Iris Recognition - Iris The colored part of the eye...

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May 10, 2004 USVISIT - ITR Project Meeting 1 CSE190a Fal 06 Iris Recognition Biometrics CSE 190-a Lecture 18 Iris The colored part of the eye is called the iris .I t controls light levels inside the eye similar to the aperture on a camera. The round opening in the center of the iris is called the pupil . The iris is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size. The sphincter muscle lies around the very edge of the pupil. In bright light, the sphincter contracts, causing the pupil to constrict. The dilator muscle runs radially through the iris, like spokes on a wheel. This muscle dilates the eye in dim lighting. The iris is flat and divides the front of the eye (anterior chamber) from the back of the eye (posterior chamber). Its color comes from microscopic pigment cells called melanin . The color, texture, and patterns of each person's iris are as unique as a fingerprint. http://www.stlukeseye.com/anatomy/Iris.asp Anatomy of the eye Structure of Eye and location of Iris ht p:/ www.maculacenter.com/eyeanatomy.htm Iris Iris • Iris is the annular region of the eye responsible for controlling and directing light to the retina. It is bounded by the pupil and the sclera (white of the eye); iris is small (11 mm) • Visual texture of the iris stabilizes during the first two years of life and carries distinctive information useful for identification • Each iris is unique; even irises of identical twins are different © IEEE Computer 2000 Advantages of Iris for Recognition Advantages of Iris for Recognition • Believed to be stable over a person’s lifetime • Pattern is epigenetic (not genetically determined) • Internal organ, highly protected and rarely damaged or changed • Iris patterns possess a high degree of randomness • Imaging procedure is non-invasive • Template size is small • Image encoding and matching process is fast Stability of Iris Pattern The iris begins to form in the third month of gestation, and the trabacular network creating its pattern are largely complete by the eighth month. Pigment accretion can continue into the first postnatal years. Iris color is determined mainly by the density of melanin pigment. Blue irises result from an absence of pigment. “The available clinical evidence indicates that the trabecular pattern itself is stable throughout the lifespan.”
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May 10, 2004 USVISIT - ITR Project Meeting 2 Iridology “Throughout the ages, the eyes have been known as the windows to the soul, and modern behavioral research is proving this adage to be true. If you look closely at the iris of the eye, you will notice small, dark dots, light streaks or rounded openings in the fibers. These characteristics provide the key to unlocking the mysteries of the personality” (Rayid International).
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lec18 Iris Recognition - Iris The colored part of the eye...

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