Patent ID: 6754667
Filing Date: 2004-06-22
Classification: G06F,G06K,Y10S

Abstract:
A method for constructing a database storing images and image descriptors representing characteristics of the images, the method comprising the steps of:a) receiving an image; b) extracting an image descriptor from the image based on at least an angular component and a radial component of the image; c) storing the image on an image database; and d) storing the image descriptor on an image descriptor database, wherein the image descriptor includes j (j is a natural number) ART coefficients each of which is expressed as: Fn&it;â€ƒ&it;m=<Vn&it;â€ƒ&it;m&af;(Ï ,Î¸),f&af;(Ï ,Î¸)>=&Integral;02&it;Ï€&it;&Integral;01&it;Vn&it;â€ƒ&it;m*&af;(Ï ,Î¸),f&af;(Ï ,Î¸)&it;Ï &it;&dd;Ï &it;â€ƒ&it;&dd;Î¸where, Fnm is an ART coefficient of order n and m, n and m are integer numbers, Vnm(&rgr;,&thgr;) is an ART basis function, Æ’(&rgr;,&thgr;) is an image in polar coordinates, and * denotes a conjugate complex number.