Show-through watermarking of duplex printed documents

Details Show-through watermarking of duplex printed documents Show-through watermarking of duplex printed documents

2007-10-23

2007-10-23

Bella, Matthew C. (Department: 2624)

Image analysis

Applications

Reexamination Certificate

active

09652291

ABSTRACT:
A printing apparatus and method for duplex printing a document having a show-through watermark wherein the watermark is comprised of first and second images on both sides of the document. The images comprise stoclustic halftone screens having a substantially common registration wherein the second image is relatively shifted from the first image for forming an associated overlay pattern between the first and second images resulting in a recognizable pattern comprising the watermark upon illumination by a show-through light source. The watermark is unrecognizable from either image alone upon illumination from a front light source. The relative shifting can be implemented by either phase, frequency or angle shifting between the front and back side images.

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Sharma, Gaurav and Trussell, H. Joel, “Digital Color Imaging”, IEEEE Transactions On Image Processing, vol. 6, No. 7, Jul. 1997, pp. 901-932.

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