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An example of image transformation in polar coordinates and the size normalization. (a) Iris region in Cartesian coordinates; (b) normalized image of (a) in polar coordinates; (c) periocular region based on w1 × IRrad in Cartesian coordinate; (d) normalized image of (c) in polar coordinate; (e) periocular region based on w2 × IRrad in Cartesian coordinate; (f) normalized image of (e) in polar coordinates.
