Watermarking holograms
First Claim
1. A method of embedding a digital watermark in an optically variable device comprising:
- creating a watermark image; and
embedding the watermark image into a holographic structure.
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Accused Products
Abstract
Methods for integrating digital watermarks into holograms, watermarked hologram structures, and related applications. One method creates a watermark image, and then embeds the watermark image into a holographic structure. The holographic structure is created using computer generated holography to create a digital representation of the holographic structure. This digital representation is recorded on a physical substrate using optical techniques or microlithography. As an alterative, a watermark signal is embedded in a physical holographic structure by embedding the signal into an image that is optically merged with the holographic structure as it is optically recorded, or by embedding the signal into an image or physical model from which the holographic structure is formed. Another approach the creates a halftone watermarked image, and forms the halftone watermarked image in the hologram by creating hologram dots corresponding to the dots in the halftone watermarked image.
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Citations
52 Claims
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1. A method of embedding a digital watermark in an optically variable device comprising:
creating a watermark image; and
embedding the watermark image into a holographic structure.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 49, 50, 51, 52)
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28. A method for integrating a digital watermark into a hologram comprising:
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creating a halftone watermarked image; and
forming the halftone watermarked image in the hologram by creating hologram dots corresponding to the dots in the halftone watermarked image.
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46. A watermark reader operable to decode a watermark from a watermarked hologram, the decoder comprising:
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a watermark decoder for detecting a watermark signal in an image scanned from a watermarked hologram; and
a message decoder for extracting a message from the watermark signal.
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Specification