| 摘要 |
<p>An iris recognition system capable of remarkably reducing time taking from an image pickup of an iris image to generation of an iris code and of simplifying the construction is implemented. A sensor 10 comprises a group of pixels arranged in polar coordinates. An iris image is controlled so that the iris image is correctly formed on the sensor 10, particularly, the center of the iris image matches. The inner and outer diameters of the iris are detected according to the iris image formed on the sensor 10, and the difference between the inner diameter and the outer diameter in the radial direction is detected. The number i of pixels of each ring in the case of division into the predetermined number of concentric ring bands is calculated according to the difference. A weighted mean processing part 13 performs a weighted mean operation according to the number i of pixels. A band-pass filter 15 performs a processing in the tangential and radial directions of feature extraction of the iris image of each ring band and generates the iris code with a binary format formed by a binary circuit 16.</p> |
