1. An iris recognition system comprising: a camera for acquiring an image of an eye; and a computer for estimating a center of a pupil of the eye, identifying a border of the pupil, adjusting the center of the pupil, segmenting an iris from the border of the pupil to at least an outside border of the iris, and estimating a shape of the iris; and wherein: the border of the pupil is an inside border of the iris; the shape of the iris is estimated as a regular shape while extracting the irregular actual shape of the inside border and the outside border of the iris; the computer is further for delineating symmetric segments from a curvature perspective opposite of each other encompassing the pupil border and the outside border of the iris; the identifying the border of the pupil is a snake delineation of the border of the pupil and the outside border of the iris; the snake delineation is performed with one dimensional segmentation; the one dimensional segmentation is performed in a polar domain originating at about the center of the pupil; the border of the pupil and the outside border of the iris are deployed in an analysis as irregular curves without further approximation to regular shapes; and the irregular shapes are normalized in the polar map.