IRIS Recognition: A Review
Pallavi Kharat, Manjusha Pradeep Deshmukh · 2013
Abstract: Iris recognition can be considered as one of the most reliable and accurate method of biometric technology when compared with other biometric technologies such as face, fingerprint and speech recognition. The iris is an externally visible, yet protected organ whose unique epigenetic pattern remains stable throughout adult life. These characteristics make it very attractive for use as a biometric for identifying individuals. Image processing techniques can be employed to extract the unique iris pattern from a digitised image of the eye, and encode it into a biometric template, which can be stored in a database. This biometric template contains an objective mathematical representation of the unique information stored in the iris, and allows comparisons to be made between templates. When a subject wishes to be identified by iris recognition system, their eye is first photographed, and then a template created for their iris region. This template is then compared by hamming distance with the other templates stored in a database until either a matching template is found and the subject is identified, or no match is found and the subject remains unidentified. The Human Iris The iris is a thin circular anatomical structure in the eye. The iris’s function is to control the diameter and size of the pupils and hence it controls the amount of light that progresses to the retina. Figure1 shows front view of the iris. To control the amount of light entering the eye, the muscles associated with the iris (sphincter and dilator) either expand or contract the centre aperture of the iris known as the pupil.