Patent ID: 7072486

Claim:
An image processing system for processing an input image containing an object image with a predetermined pattern which may have been magnified, said image processing system comprising: characteristic quantity computing unit that computes a plurality of characteristic quantities of said object image, wherein said plurality of characteristic quantities include pixel information representing the predetermined pattern of said object image, said pixel information includes ON pixel information and ON/OFF inverse information, said ON pixel information includes the number of ON pixels, and said ON/OFF inverse information includes ON and OFF inverse pixels; a plurality of magnification estimating units that estimate a plurality of magnification levels on the basis of said plurality of characteristic quantities computed by and output from said characteristic quantity computing unit; and judging unit that judges whether or not said object image is present in said input image, on the basis of whether or not the plurality of magnification levels estimated by said plurality of magnification estimating units are coincident with one another.