Marking articles using a covert digitally watermarked image
First Claim
1. An object comprising at least one digitally watermarked image, said digitally watermarked image being normally invisible and comprising a material that causes said digitally watermarked image to become detectable due at least in part to an optically absorptive property of said digitally watermarked image when exposed to a predetermined excitation source.
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Abstract
A marking system that includes forming at least one marking in or on an article, wherein the image formed is not visible to the unaided human observer, and further contains at least one digital watermark. 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, 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.
112 Citations
37 Claims
- 1. An object comprising at least one digitally watermarked image, said digitally watermarked image being normally invisible and comprising a material that causes said digitally watermarked image to become detectable due at least in part to an optically absorptive property of said digitally watermarked image when exposed to a predetermined excitation source.
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8. An article comprising a marking, the marking comprising:
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a first digitally watermarked image, said digitally watermarked image being normally invisible and comprising a material that causes said digitally watermarked image to become detectable due at least in part to an optically absorptive property of said digitally watermarked image when exposed to a predetermined excitation source; and
,a second digitally watermarked image disposed upon said article, wherein said second digitally watermarked image is substantially observable to the unaided observer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21)
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15. An article comprising a marking, the marking comprising:
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a first digitally watermarked image, said digitally watermarked image being normally invisible and comprising a material that causes said digitally watermarked image to become detectable due at least in part to an optically absorptive property of said digitally watermarked image when exposed to a first predetermined excitation source; and
,at least one second digitally watermarked image, said second digitally watermarked image being normally invisible and comprising a material that causes said second digitally watermarked image to become detectable when exposed to a second predetermined excitation source.
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22. A method of forming a mark on an article, comprising:
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selecting a marking for said article; and
,exposing said article to ultraviolet light for applying at least one digitally watermarked image of said marking to said article, wherein said at least one digitally watermarked image is not substantially observable to the unaided observer, and said at least one digitally watermarked image being observable upon exposure to a predetermined excitation source. - View Dependent Claims (23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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28. A method of examining an article containing a mark, the method comprising:
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providing an article having said mark, said mark comprising at least one digitally watermarked image, said digitally watermarked image being normally invisible and comprising a material that causes said digitally watermarked image to become detectable due at least in part to an optically absorptive property of said digitally watermarked image when exposed to a predetermined excitation source;
exposing said article to said predetermined excitation source;
detecting said at least one digital watermark in accordance with at least a partial absorption of UV light; and
,decoding said at least one digital watermark.
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Specification