Data processing apparatus and method

Details Data processing apparatus and method Data processing apparatus and method

2007-11-27

2007-11-27

Revak, Christopher (Department: 2131)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C382S100000, C380S054000

Reexamination Certificate

active

10317533

ABSTRACT:
A watermarking system comprises an encoding data processor operable to generate at least one marked version of an original item of material by introducing one of a predetermined set of code words into a copy of the original material item. The encoding processor comprises a code word generator operable to form the code word by generating a plurality of code word coefficients, and an encoder operable to combine the code word coefficients with the material item, and an adaptation processor. The adaptation processor is operable to adapt the strength of the code word coefficients or the material item samples in accordance with a relative sensitivity of the material item samples to carry the code word coefficients. The strength of the watermark is therefore adapted in accordance with the sensitivity of the material item to carry watermark code word coefficients. As a result there is a reduced likelihood of an attacker identifying parts of the material item to which the watermark code word has been added. A likelihood of a successful attack is thereby reduced whilst maintaining a desired false negative detection probability.The watermarking system finds particular application in identifying a point of distribution of pirate copies of video material generated by capturing the watermarked image, using, for example, a camcorder in a cinema.

REFERENCES:
patent: 5664018 (1997-09-01), Leighton
patent: 5949885 (1999-09-01), Leighton
patent: 6104826 (2000-08-01), Nakagawa et al.
patent: 6385329 (2002-05-01), Sharma et al.
patent: 6424725 (2002-07-01), Rhoads et al.
patent: 6738493 (2004-05-01), Cox et al.
patent: 6839673 (2005-01-01), Choi et al.
patent: 2002/0037091 (2002-03-01), Terasaki
patent: 2003/0099355 (2003-05-01), Moroney
patent: 2003/0115052 (2003-06-01), Chen et al.
patent: 2005/0108541 (2005-05-01), Yacobi et al.
patent: 0 951 183 (1999-10-01), None
patent: 2 351 409 (2000-12-01), None
patent: WO 96/36163 (1996-11-01), None
patent: WO 99/60792 (1999-11-01), None
Cox, I. J.; Kilian, J.; Leighton, F.T.; Shamoon, T., Secure Spread Spectrum Watermarking for Multimedia, Dec. 1997, Image Processing, IEEE Transaction on, vol. 6, Issue 12, pp. 1673-1687.
Wang, Q.; Shenghe, S., DCT-Based Image-Independent Digital Watermarking, 21-25, Signal Precessing Proceedings, 2000. WCCC-ICSP 2000, 5th International Conference on, vol. 2, pp. 942-945.

Affiliated with

Also associated with

Rating

Data processing apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data processing apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data processing apparatus and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3856162