The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 2003
Filed:
Jul. 09, 1999
Haruo Ito, Yokohama, JP;
Media Technology Corporation, Yokohama, JP;
Abstract
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 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 , 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 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 performs a weighted mean operation according to the number i of pixels. A band-pass filter 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