Low visibility watermark using time decay fluorescence
First Claim
Patent Images
1. A copy detection method comprising:
- receiving optical scan data associated with a printed object, wherein the printed object comprises a first-machine readable component printed thereon with first ink comprising a first emission decay time, and a second component printed thereon with second ink comprising a second emission decay time; and
machine-reading the first component when emissions of the second ink decay to a first predetermined level.
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Abstract
A physical object is embedded with a first digital watermark component and a second digital watermark component. The first component is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second component is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The first component is detected after the first emission decay time, but before the second emission decay time.
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Citations
20 Claims
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1. A copy detection method comprising:
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receiving optical scan data associated with a printed object, wherein the printed object comprises a first-machine readable component printed thereon with first ink comprising a first emission decay time, and a second component printed thereon with second ink comprising a second emission decay time; and
machine-reading the first component when emissions of the second ink decay to a first predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
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10. A method comprising:
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providing a first component in a first color channel, wherein the first color channel is to be printed with a first ink comprising a first emission rate; and
providing a second component in a second color channel, wherein the second component is provided so as to be reduce humanly perceptible artifacts that are attributable to the first component. - View Dependent Claims (11, 20)
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12. A copy detection method comprising:
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obtaining optical scan data of a physical object, wherein the physical object includes a first digital watermark component embedded in a first channel with a first ink having a first decay time and a second digital watermark component embedded in a second channel, wherein the second digital watermark component is embedded so as to reduce a human perceptible artifacts that are attributable to the first digital watermark component; and
analyzing the optical scan data at a predetermined position to obtain at least a portion of the first digital watermark component. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification