Image analysis – Applications – Reading paper currency
Reexamination Certificate
2000-02-29
2003-08-19
Patel, Jayanti K. (Department: 2625)
Image analysis
Applications
Reading paper currency
C283S072000, C382S276000
Reexamination Certificate
active
06608919
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to paper-making, and more particularly relates to techniques useful in encoding information in paper during its formation.
BACKGROUND AND SUMMARY OF THE INVENTION
Digital watermarking is a burgeoning science with an extensive literature. Some of it, by the present assignee, relates to texturing the surface of a paper to convey optically-detectable digital information.
The assignee's U.S. Pat. No. 5,850,481, for example, details how the micro topology of a paper can be shaped, e.g., by a Braille-like machine, to encode digital data. The assignee's application Ser. No. 09/127,502 details how the high-pressures used in intaglio printing can be used to similar effect.
In accordance with a preferred embodiment of the invention, paper is textured during the paper-making process, rather than in a subsequent process, thereby affording various advantages. The texture yields a known signature when transformed to the frequency domain. This signature can be used for various purposes, including determining the angular orientation of the paper when scanned and analyzed for the presence of watermark data, and for simple document recognition purposes (e.g., photocopiers that refuse to reproduce banknotes). One way of effecting the desired texturing is by shaping the surface of a de-watering element accordingly.
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patent
Conwell William Y.
Digimarc Corporation
Digimarc Corporation
Patel Jayanti K.
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