Patent ID: 8588479
Filing Date: 2013-11-19
Classification: A61B,G06K,G07C

Abstract:
1. A biometric authentication apparatus, comprising: a curve calculating unit for calculating, based on a digital image of an iris, curves showing a relationship between polar coordinates indicating a position of the iris on the digital image and luminances of pixels of the digital image of the iris corresponding to coordinate values of the polar coordinates; and a code generating unit for generating a comparison target code by arranging polarities of slopes of the curves in order of the polar coordinates, wherein the curve calculating unit possesses: a first partitioning unit for partitioning the digital image of the iris into multiple annular regions; a calculating unit for calculating for each of the annular regions an average value of the luminances of the pixels superimposed on a line segment, said line segment having end points at a reference point inside a circle defining an inside edge of the iris and a point outside the circle defining an outside edge of the iris, by causing the line segment to rotate about the reference point; and a curve generating unit for generating a curve showing the relationship between an angle of rotation of the line segment and the average value of the luminances for each of the annular regions.