Patent ID: 6254007
Filing Date: 2001-07-03
Classification: B41M,B42D,G06K,G07D,H04N,Y10S

Abstract:
A method of preparing a security document comprising the steps of:designating a security image area on a face of a document;dividing said security image area into a plurality of image element cells, such that said image element cells define an array of image element cells across said security image area; anddesignating respective printed tiling elements to be printed in selected ones of said image element cells to define a printed security image and a printed complementary security image within said security image area, whereinindividual ones of said respective printed tiling elements comprise printed units positioned within said respective image element cells,said printed units are positioned such that image element cells including said respective printed tiling elements define substantially identical repeating printed elements, and such that individual ones of said repeating printed elements comprise apportioned repeating printed elements, andsaid apportioned repeating printed elements are defined by a combination of printed units from neighboring image element cells.