Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2002-12-12
2009-02-03
Sheikh, Ayaz R (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C382S100000, C380S210000, C380S054000
Reexamination Certificate
active
07487355
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 data processor is arranged to form other code words of the set by cyclically shifting a first code word. The system includes a detecting data processor operable to identify the code word in the marked material item. The detecting data processor is operable to recover the code word from the marked material item and to form a Fourier transform of the recovered code word and a Fourier transform of the first code word of the set. The data detecting processor forms correlation samples by forming an inverse transform of a combination of the recovered and the first code word. Each of the correlation value samples provides the correlation value for one of the set of code words. A computationally efficient way of calculating the correlation for each code word in the set is thereby provided. As a result a time taken to detect a code word present in a marked material item is improved. 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: 5949885 (1999-09-01), Leighton
patent: 6104826 (2000-08-01), Nakagawa et al.
patent: 6424725 (2002-07-01), Rhoads et al.
patent: 6738493 (2004-05-01), Cox et al.
patent: 2002/0037091 (2002-03-01), Terasaki
patent: 2003/0099355 (2003-05-01), Moroney
patent: 2005/0108541 (2005-05-01), Yacobi et al.
patent: 0 860 997 (1998-08-01), None
patent: 1 089 550 (2001-04-01), None
patent: 1 217 840 (2002-06-01), None
patent: WO 99/45705 (1999-09-01), None
patent: WO 00 33282 (2000-06-01), None
patent: WO 01 11563 (2001-02-01), 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.
Baitello R. et al.: “From Watermark detection to watermark decoding : a PPM approach” Signal Processing, Amsterdam, NL, vol. 81, No. 6, Jun. 2001, pp. 1261-1271, XP004241226 ISSN: 0165-1684.
Kalker T. et al.: “A Video Watermarking System for Broadcast Monitoring” Proceedings of the SPIE, SPIE, Bellingham, VA, US, vol. 3657, Jan. 25, 1999, pp. 103-112, XP000949142 ISSN: 0277-786X.
Duan F. Y. et al.: “Intra-block algorithm for digital watermarking” Pattern Recognition, 1998. Proceedings. Fourteenth International Conference on Brisbane, Qld., Australia Aug. 16-20, 1998, Los Alamitos, CA, USA, IEEE Comput. SOC, US, Aug. 16, 1998, pp. 1589-1591, XP010297885 ISBN: 0-8186-8512-3.
Haitsma J. et al.: “A watermarking scheme for digital cinema” Proceedings 2001 International Conference on Image Processing. ICIP 2001. Thessaloniki, Greece, Oct. 7-10, 2001, International Conference on Image Processing, New York, NY: IEEE, US, vol. 1 of 3. Conf. 8, Oct. 7, 2001 pp. 487-489, XP010563804 ISBN: 0-7803-6725-1.
Pelly Jason Charles
Tapson Daniel Warren
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sheikh Ayaz R
Sherkat Arezoo
Sony United Kingdom Limited
LandOfFree
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.
Profile ID: LFUS-PAI-O-4061647