Watermark holograms
First Claim
1. A method of embedding a digital watermark in an optically variable device comprising:
- creating a watermarked image using a carrier and a variable message to form a watermark signal and modifying a host digital image to embed the watermark signal into the host digital image; and
forming a holographic structure from at least the watermarked image.
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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.
168 Citations
50 Claims
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1. A method of embedding a digital watermark in an optically variable device comprising:
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creating a watermarked image using a carrier and a variable message to form a watermark signal and modifying a host digital image to embed the watermark signal into the host digital image; and
forming a holographic structure from at least the watermarked image.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
embedding two or more different watermarked signals into the holographic structure.
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7. A computer readable medium on which is stored software for creating a digital representation of the holographic structure using the method of claim 1.
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8. A watermark decoder for detecting a watermark signal from a digital image captured of a physical representation of the holographic structure of claim 1.
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9. A physical holographic structure embedded with a watermark according to the method of claim 1.
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10. The holographic structure of claim 9 wherein the watermark is machine readable by executing a watermark decode process on a digital image captured of the holographic structure.
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11. The holographic structure of claim 10 wherein the watermark carries a message, including an identifier number.
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12. The holographic structure of claim 11 wherein the identifier number comprises a serial number to identify the holographic structure or group of holographic structures.
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13. The holographic structure of claim 10 wherein the watermark carries authentication information that is compared with information related to an object bearing the holographic structure to authenticate the object.
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14. The holographic structure of claim 13 wherein the information related to the object is on the object in a machine readable form.
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15. The holographic structure of claim 13 wherein the information related to the object is stored in a database record indexed by the message carried in the watermark.
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16. The holographic structure of claim 10 wherein the watermark carries a key used to decode an authentication mark on an object bearing the holographic structure.
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17. The holographic structure of claim 10 wherein the watermark carries an index to a database record storing information related to an object bearing the holographic structure.
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18. The holographic structure of claim 10 wherein the watermark carries a message used to look up a network address of a network resource related to an object bearing the holographic structure.
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19. The holographic structure of claim 10 wherein the watermark is encoded so as to be viewable only at selected orientation and focal plane.
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20. A method of embedding a digital watermark in an optically variable device comprising:
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creating a watermark image; and
embedding the watermark image into a holographic structure;
wherein the watermark image modulates a 2D or 3D digital image model to create a watermarked image, and the watermarked image is transformed into the holographic structure.
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21. A method of embedding digital watermark in an optically variable device comprising:
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creating a watermark image; and
embedding the watermark image into a holographic structure;
wherein the watermark image is transformed into the holographic structure; and
wherein the watermark image is integrated into the holographic structure using wavefront calculations to calculate a digital representation of the holographic structure, which is recorded on a physical medium by optically creating a diffraction grating on the physical medium or using microlithography to reproduce the holographic structure on the physical medium.
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22. A method of embedding a digital watermark in an optically variable device comprising:
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creating a watermark image; and
embedding the watermark image into a holographic structure;
wherein creating the watermark image includes;
spread spectrum modulating a binary message to create the watermark image in a digital form.
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23. A method of embedding a digital watermark in an optically variable device comprising:
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creating a watermark image; and
embedding the watermark image into a holographic structure;
wherein creating the watermark image includes spread spectrum modulating a binary message to create a watermark signal; and
including;
altering values of a host image to embed the watermark signal in the host image, such that the altered host image forms the watermark image. - View Dependent Claims (24)
perceptually adapting the watermark signal to the host image such that the watermark signal is imperceptibly embedded in the host image.
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25. A method of embedding a digital watermark in an optically variable device comprising:
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creating a watermark image; and
embedding the watermark image into a holographic structure;
including embedding two or more different watermark signals into the holographic structure;
wherein one of the watermark signals encodes a key to decode another watermark signal.
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26. A method of embedding a digital watermark in an optically variable device comprising:
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creating a watermark image; and
embedding the watermark image into a holographic structure;
wherein the watermark image includes an orientation signal used to re-align image data scanned from the holographic structure before decoding the watermark image.
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27. A method for integrating a digital watermark into a hologram comprising:
creating a halftone watermarked image, including generating a message of two or more symbols, modulating a carrier signal with the message;
the watermarked halftone image being formed from the modulated carrier such that the message is embedded in the watermarked halftone image; and
forming the halftone watermarked image in the hologram by creating hologram dots corresponding to the dots in the halftone watermarked image.- View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for integrating a digital watermark into a hologram comprising:
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creating halftone watermark image, including spread spectrum modulating a message to create a watermark signal and mapping elements of the watermark signal to discrete locations in the halftone image; and
forming the halftone watermarked image in the hologram by creating hologram dots corresponding to dots in the halftone watermarked image.
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42. A method for integrating a digital watermark into a hologram comprising:
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creating halftone watermarked image including error correction encoding a message and embedding the message in a halftone image to create the halftone watermarked image; and
forming the halftone watermarked image in the hologram by creating hologram dots corresponding to dots in the halftone watermarked image.
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43. A physical holographic structure embedded with a watermark by 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;
wherein the watermark is machine readable by executing a watermark decode process on a digital image captured of the holographic structure, the watermark carries authentication information that is compared with information related to an object hearing the holographic structure to authenticate the object, the information related to the object is on the object in human or machine readable form and the information related to the object is stored in a database record indexed by the message carried in the watermark.
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44. A watermark reader operable to decode a watermark from a watermarked hologram, the reader 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, the message decoder operable to demodulate the message from a modulated carrier signal embedded in the image scanned from the watermarked hologram. - View Dependent Claims (45, 46, 47, 48)
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49. A watermark reader operable to decode a watermark from a watermarked hologram, the reader 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; and
wherein the reader is operable to establish a connection with a network resource using the message. - View Dependent Claims (50)
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Specification