| 摘要 |
A security document is prepared by designating specialized tiling elements to be printed in selected image element cells across the face of the document. In accordance with one embodiment of the present invention, a method of preparing a security document is provided comprising the steps of: (i) designating a security image area on a face of a document; (ii) dividing the security image area into a plurality of image element cells, such that the image element cells define an array of image element cells across the security image area; and (iii) designating respective printed tiling elements to be printed in selected ones of the image element cells to define a printed security image and a printed complementary security image within the security image area. Individual ones of the respective printed tiling elements comprise printed units positioned within the respective image element cells. The printed units are positioned such that image element cells including the respective printed tiling elements define substantially identical repeating printed elements, and such that individual ones of the repeating printed elements comprise apportioned repeating printed elements. The apportioned repeating printed elements are defined by a combination of printed units from neighboring image element cells.
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