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Title:
MARKING ARTICLES USING A COVERT DIGITALLY WATERMARKED IMAGE
Document Type and Number:
WIPO Patent Application WO2002098670
Kind Code:
A3
Abstract:
A marking system that includes forming at least one marking in or on an article (420), wherein the image formed is not visible to the unaided human observer, and further contains at least one digital watermark (435). The digitally watermarked image comprises emissive and photoabsorptive portions. The digitally watermarked image is applied using a substance reactive to a predetermined excitation source, and exposure to ultraviolet light. Other traditional techniques, such as printing with fluorescent inks may be used in combination. The digitally watermarked image is subsequently observable upon exposure to the predetermined excitation source. The digitally watermarked image may be observed and decoded by appropriately configured detection systems (400), wherein the information obtained may be used for purposes including, but not limited to, authentication and security of the article or information contained within the article.

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Inventors:
LAWANDY NABIL M
CONROY JEFFREY L
SMUK ANDREI Y
Application Number:
PCT/US2002/017868
Publication Date:
April 03, 2003
Filing Date:
June 06, 2002
Export Citation:
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Assignee:
SPECTRA SYSTEMS CORP (US)
International Classes:
B41M3/00; B41M3/10; B41M3/14; H04N1/387; B42D15/00; B42D15/10; G06T1/00; G07F7/08; G11B7/244; G11B7/247; G11B7/249; G11B7/254; G11B7/26; G11B20/00; G11B23/00; G11B23/28; G11B23/30; G11B23/38; G11B7/246; H04N1/00; H04N1/32; (IPC1-7): G06K19/06; G06K7/10; G06C21/00
Foreign References:
US6354501B12002-03-12
US6315329B12001-11-13
US6442276B12002-08-27
US6458294B22002-10-01
US4678898A1987-07-07
US4538059A1985-08-27
US3802101A1974-04-09
US4889367A1989-12-26
US5525798A1996-06-11
Other References:
See also references of EP 1412915A4
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