Patent ID: 8861799

Claim:
A method for creating a segmented iris image from an image of an eye of a subject, comprising: obtaining the image of the eye; detecting an iris region in the image of the eye, the iris region having an inner boundary and an outer boundary; and remapping pixels in the iris region, represented in a Cartesian coordinate system, to pixels in the segmented iris image, represented in a log-polar coordinate system, by employing a logarithm representation process that calculates an intensity value for each pixel (h, α) in the segmented iris image from the corresponding pixel (x, y) in the iris region, x=(r+r in ) cos α+x 0 and y=(r+r in ) sin α+y 0 , wherein each pixel in the iris region is located a distance r from the inner boundary, α is a horizontal index of the corresponding pixel in the segmented iris image, wherein r is at least one of r=s exp(βh), and r=s log b (βh), where s is a scaling factor to map vertical indices in the segmented iris image linearly into [0, r out −r in ], where r in is a distance from a center point in a pupil region of the eye to the inner boundary, and r out is a distance from the center point in the pupil region of the eye to the outer boundary, and β is a factor that varies the emphasis placed on the iris region near the inner boundary.