Iris Feature Extraction and Encoding

The iris is the colored part of the human eye that controls the amount of light that enters into the eye located behind the corona between the sclera and the pupil. The iris is an extremely complex structure with many small-scale features detectable by visual means, including image analysis. It contains many collagenous fibers, contraction furrows, coronas, crypts, colors, freckles, rifts, and pits, ciliary processes, rings. Measuring the patterns of these features and their spatial relationships to each other provides other quantifiable parameters useful to the identification and verification process. The most difficult part of the identification process is Iris localization it defines the inner and outer boundaries of iris area used for feature analysis. The iris feature extraction is the important part in the identification process. To overcome the contrast and illumination iris image we use complex Gabor filter with phase demodulator to encoding iris features. The phase demodulator is simply a four-quadrant plane that maps the resulting feature matrix, from applying the normalized image to Gabor filter, to binary code. This mapping depends on the sign of both the real and imaginary part of the feature matrix. In this paper, we show how to get Iris code with different Sizes using phase demodulator this paper shows how to extract iris code depends on the phase calculations.