Multi-channel digital watermarking

• US 7,706,565 B2
• Filed: 09/13/2004
• Issued: 04/27/2010
• Est. Priority Date: 09/30/2003
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Levy, Kenneth L., Stewart, Steven W.
• Primary Examiner(s): Seth; Manav
• Application Number:
  US10/940,409
• Publication Number:
  US 20050078851A1
• Time in Patent Office: 2,052 Days
• Field of Search: 382/100, 382/232, 713/176, 380/54, 380/210, 380/252, 380/287, 704/200.1, 704/273, 381/73.1, 348/460, 348/463
• US Class Current: 382/100
• CPC Class Codes: B42D 25/00 Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof printing processes to produce identification or security features B41M3/14
• CPC Class Codes: B42D 25/23 Identity cards
• CPC Class Codes: B42D 25/333 Watermarks
• CPC Class Codes: G06K 19/06046 Constructional details
• CPC Class Codes: G06K 7/12 using a selected wavelength, e.g. to sense red marks and ignore blue marks
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation

Abstract

The present invention provides digital watermarks through multiple channels. The channels can include, e.g., visible, ultraviolet and infrared channels. The non-visible channels can be selected to fluoresce either in the visible or IR/UV spectrums upon the appropriate illumination in the infrared or ultraviolet spectrums. The watermarks in the various multiple channels can cooperate to facilitate watermark detection or to authenticate an object in which the watermarks are embedded. In other implementations the multiple watermarks include so-called orientation components. A relative relationship between the orientation components is used to convey data.

Claims

1. A method of carrying a plural-bit digital watermark payload in host media content, said method comprising:

utilizing a configured multi-purpose electronic processor, providing a first digital watermark signal comprising a first orientation component in the host media content;

utilizing a configured multi-purpose electronic processor, providing a second digital watermark signal comprising a second orientation component in the host media content; and

carrying a plural-bit digital watermark payload in the host media content through a relative orientation relationship between the first digital watermark orientation component and the second digital watermark orientation component.

2. The method of claim 1, further comprising:

utilizing a configured multi-purpose electronic processor, providing a third digital watermark signal in the host media content, the third digital watermark signal comprising a third orientation component, wherein said act of carrying comprises carrying the plural-bit digital watermark payload through a relative orientation relationship of the first orientation component with the second and third orientation components.

3. The method of claim 1, wherein the first digital watermark signal comprises a first plural-bit message component and the second digital watermark signal comprises a second plural-bit message component.

4. The method of claim 1, wherein the relative orientation relationship is determined in terms of at least one of rotation, scale or translation.

5. The method of claim 3, wherein the first orientation component is useful to orient image or video data to read the first message component, and wherein the second orientation component is useful to orient image or video data to read the second message component.

19. A computer readable media comprising instructions stored thereon to cause a multi-purpose computer processor to perform the acts of claim 1.

6. A method comprising:

utilizing a configured multi-purpose electronic processor, hiding a first steganographic signal in media, the media representing audio or video, the first steganographic signal comprising a first orientation or calibration signal;

utilizing a configured multi-purpose electronic processor, hiding a second steganographic signal in the media, the second steganographic signal comprising a second orientation or calibration signal;

whereby a plural-bit steganographic payload is carried in the media via a relative relationship between the first orientation or calibration signal and the second orientation or calibration signal.

7. The method of claim 6 wherein the first steganographic signal further comprises a first plural-bit message component and the second steganographic signal comprises a second plural-bit message component.

8. The method of claim 7 wherein the first orientation or calibration signal provides orientation or calibration information useful to detect the first message component.

9. The method of claim 8 wherein the second orientation or calibration signal provides orientation or calibration information useful to detect the second message component.

10. The method of claim 6, wherein the relative relationship is provided in terms of at least one of rotation, scale or translation.

11. The method of claim 6 wherein the media comprises at least one of video, imagery or audio.

12. The method of claim 6 further comprising providing the media on a physical object through printing or engraving.

13. A method comprising:

obtaining a plural-bit message;

obtaining a host signal representing audio or video;

utilizing a configured multi-purpose electronic processor, steganographically hiding the plural-bit message in the host signal in a steganographic manner through one or more relative orientations of two or more steganographic signal components.

14. The method of claim 13 wherein a first of the two or more steganographic signal components provides orientation or calibration signal information useful to detect the message.

15. The method of claim 14 wherein a second of the two or more steganographic signal components provides orientation or calibration signal information useful to detect a second, different message that is carried in the host signal.

16. The method of claim 13, wherein the relative orientation is provided in terms of at least one of rotation, scale or translation.

17. The method of claim 13 wherein the media comprises at least one of video, imagery or audio.

18. The method of claim 13 further comprising providing the media on a physical object through printing or engraving.