Importance

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Abstract

A system for viewing a subtle image on a security document is provided including a security document, a document viewer, and a document receiving station. The security document comprises a subtle image and a security image formed on a first face of the security document, wherein security image elements are arranged in a security image element array and complementary security image elements are arranged in a complementary security image element array. The subtle image comprises a plurality of subtle image elements arranged in a subtle image element array. The subtle image element array is arranged in a pattern that is optically distinct from respective patterns of arrangement of the security image element array and the complementary security image element array. The document viewer comprises a plurality of lens elements arranged in a lens element array, wherein the plurality of lens elements define a document viewer focal plane, and the lens elements within the lens element array are arranged to render the subtle image readily apparent to the naked eye by enhancing the appearance of the subtle image elements relative to the security image elements and the complementary security image elements and by degrading the appearance of the security image elements and the complementary security image elements relative to the subtle image elements. The document receiving station is positioned to receive the document such that the document may be positioned substantially in the document viewer focal plane.

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First Claim