Digital watermark detection utilizing host carrier information

• US 7,574,014 B2
• Filed: 02/07/2006
• Issued: 08/11/2009
• Est. Priority Date: 03/19/1999
• Status: Expired due to Fees

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Sharma, Ravi K., Rhoads, Geoffrey B., Gustafson, Ammon E.
• Primary Examiner(s): Tabatabai; Abolfazl
• Application Number:
  US11/349,743
• Publication Number:
  US 20070047760A1
• Time in Patent Office: 1,281 Days
• Field of Search: 382/100, 382/232, 382/240, 380/51, 380/54, 380/201, 380/210, 380/252, 380/287, 713/176, 713/179, 370522-529, 283/72, 283 74- 81, 283/85, 283/93, 283/113, 283/901, 283/902, 348/461, 348/463, 358/3.28
• US Class Current: 382/100
• CPC Class Codes: G06T 1/0071 using multiple or alternating watermarks
• CPC Class Codes: G06T 1/0078 using multiple thresholds
• CPC Class Codes: G06T 2201/0065 Extraction of an embedded watermark; Reliable detection
• CPC Class Codes: H04N 1/32149 Methods relating to embedding, encoding, decoding, detection or retrieval operations
• CPC Class Codes: H04N 1/32187 with selective or adaptive application of the additional information, e.g. in selected frequency coefficients
• CPC Class Codes: H04N 1/32235 in highly textured regions
• CPC Class Codes: H04N 1/3224 in edge regions
• CPC Class Codes: H04N 2201/3233 of authentication information, e.g. digital signature, watermark
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes

Abstract

The present invention generally relates to digital watermarking and steganography. In one implementation, a method is provided including acts of receiving a media signal comprising a steganographic signal redundantly embedded therein; selecting a subset of the media signal for steganographic signal detection, wherein the subset of the media signal is selected based on at least one media signal characteristic associated with the subset; and detecting a steganographic signal hidden in the subset of the media signal. In another implementation, a digital watermark detector is providing including: electronic processing circuitry; memory; and executable instructions stored in memory for execution by said electronic processing circuitry. The instructions comprises instructions to: process a media signal comprising a digital watermark redundantly embedded therein; select a subset of the media signal for watermark detection, wherein the subset of the media signal is selected based on at least one media signal characteristic associated with the subset; and detect a digital watermark hidden in the subset of the media signal.

Claims

1. A method comprising:

receiving a media signal comprising a steganographic signal redundantly embedded therein;

utilizing a printer or computer processor, selecting a subset of the media signal for steganographic signal detection, wherein the subset of the media signal is selected based on at least one media signal characteristic associated with the subset; and

utilizing the printer or computer processor, detecting a steganographic signal hidden in the subset of the media signal.

2. The method of claim 1 wherein the subset of the media signal comprises multiple, different media signal portions.

3. The method of claim 2 wherein the media signal comprises imagery or video.

4. The method of claim 2 wherein the multiple, different media signal portions comprise image blocks.

5. The method of claim 1 wherein the media signal comprise audio.

6. The method of claim 1 further comprising inhibiting use of the media signal based on a detected steganographic signal.

7. A computer-readable medium comprising executable instructions stored therein, said instructions comprising instructions to carry out the method of claim 6.

8. The method of claim 1 wherein said method is carried out in real time as the media signal is received.

9. A computer-readable medium comprising executable instructions stored therein, said instructions comprising instructions to carry out the method of claim 8.

10. The method of claim 1 wherein the steganographic signal comprises digital watermarking.

11. The method of claim 1 wherein the media signal comprises imagery or video and wherein the characteristic comprises at least one of variance or edginess.

12. The method of claim 1 wherein the media signal comprises imagery or video and wherein the characteristic comprises at least variance and edginess.

13. The method of claim 1 wherein the characteristic is independent of the steganographic signal.

14. A computer-readable medium comprising executable instructions stored therein, said instructions comprising instructions to carry out the method of claim 1.

15. The method of claim 1 wherein the characteristic is associated with a likelihood that the steganographic signal is contained in the subset.

16. The method of claim 1 wherein the steganographic signal is hidden in the media signal through alterations to data representing the media signal.

17. The method of claim 1 wherein said act of detecting a steganographic signal hidden in the subset of the media signal transforms the subset during signal detection.

18. A computer-readable medium comprising executable instructions stored therein, said instructions comprising instructions to carry out the method of claim 17.

19. The method of claim 1 wherein further comprising displaying at least a portion of the steganographic signal once detected.

20. A computer-readable medium comprising executable instructions stored therein, said instructions comprising instructions to carry out the method of claim 19.

21. A digital watermark detector comprising:

electronic processing circuitry;

memory; and

executable instructions represented in memory, said instructions comprising instructions to;

process a media signal comprising a digital watermark redundantly embedded therein;

select a subset of the media signal for watermark detection, wherein the subset of the media signal is selected based on at least one media signal characteristic associated with the subset; and

detect a digital watermark hidden in the subset of the media signal.

22. The detector of claim 21 wherein the subset of the media signal comprises multiple, different media signal portions.

23. The detector of claim 21 further comprising instructions to inhibit use of the media signal based on a detected digital watermark.

24. The detector of claim 21 wherein processing of the media signal is carried out in real time as the media signal is received by the detector.

25. The detector of claim 21 wherein the characteristic is independent of the digital watermark.

26. The detector of claim 21, wherein the media signal comprises at least one of audio, imagery or video.

27. The digital watermark detector of claim 21 wherein the characteristic is associated with a likelihood that the digital watermark is contained in the subset.

28. The digital watermark detector of claim 21 wherein said memory comprises circuitry.