Synchronizing watermark detectors in geometrically distorted...

Details Synchronizing watermark detectors in geometrically distorted... Synchronizing watermark detectors in geometrically distorted...

2005-12-13

2005-12-13

Johns, Andrew W. (Department: 2621)

Image analysis

Applications

C382S294000

Reexamination Certificate

active

06975745

ABSTRACT:
A method of synchronizing a digital watermark detector divides a watermarked signal into blocks, each block including a portion of a watermark signal. For each block, the method computes a local correlation space comprising a neighborhood of correlation values by correlating the watermarked data in the block with a known watermark signal at a neighborhood around the block. It then finds a correlation maxima in the local correlation space for each block, where the correlation maxima indicates a local offset used to align the watermarked data in the block before decoding a watermark message from the block. To further refine the synchronization, the method filters the array of local offsets for the blocks to provide a refined set of offsets. The offsets and corresponding correlation values provide an indicator of where message symbol decoding will provide more accurate results, enabling the watermark message decoder to selectively decode symbols from portions of a signal block containing a watermark signal.

REFERENCES:
patent: 5835639 (1998-11-01), Honsinger et al.
patent: 5857038 (1999-01-01), Owada et al.
patent: 5859920 (1999-01-01), Daly et al.
patent: 5949055 (1999-09-01), Fleet et al.
patent: 6108434 (2000-08-01), Cox et al.
patent: 6122403 (2000-09-01), Rhoads
patent: 6154571 (2000-11-01), Cox et al.
patent: 6205249 (2001-03-01), Moskowitz
patent: 6263086 (2001-07-01), Wang
patent: 6278792 (2001-08-01), Cox et al.
patent: 6342924 (2002-01-01), Ikeda et al.
patent: 6408082 (2002-06-01), Rhoads et al.
patent: 6418232 (2002-07-01), Nakano et al.
patent: 6424725 (2002-07-01), Rhoads et al.
patent: 6456727 (2002-09-01), Echizen et al.
patent: 6563935 (2003-05-01), Echizen et al.
patent: 6577744 (2003-06-01), Braudaway et al.
patent: 6614914 (2003-09-01), Rhoads et al.
patent: 6738493 (2004-05-01), Cox et al.
patent: 6845170 (2005-01-01), Wendt
patent: 2002/0002679 (2002-01-01), Murakami et al.
patent: 2002/0015509 (2002-02-01), Nakamura et al.
patent: 2002/0021823 (2002-02-01), Muratani
patent: 2002/0054692 (2002-05-01), Suzuki et al.
patent: 2002/0094082 (2002-07-01), Jones et al.
patent: 2002/0114490 (2002-08-01), Taniguchi et al.
patent: 2002/0126870 (2002-09-01), Wendt
patent: 2002/0131617 (2002-09-01), Pelly et al.
patent: 2003/0086587 (2003-05-01), Haitsma et al.
patent: 2003/0099372 (2003-05-01), Wendt
patent: 1156660 (2001-11-01), None
patent: WO 99/45706 (1999-09-01), None
patent: WO 01/11563 (2001-02-01), None
patent: WO01/24113 (2001-04-01), None
patent: WO02/11051 (2002-02-01), None
patent: WO02/13138 (2002-02-01), None
patent: WO02/065753 (2002-08-01), None
patent: WO02/087250 (2002-10-01), None
Johnson et al., “Recovery of Watermarks from Distorted Images,”Proc. 3rdInt. Workshop on Information Hiding, LNCSvol. 1768, Sept./Oct. 1999, pp. 318-332.
Su et al., “Synchronized Detection of the Block-based Watermark with Invisible Grid Embedding,”Proc. SPIE vol. 4314: Security and Watermarking of Multimedia Contents III,Jan. 2001, pp. 406-417.
Osborne et al., “Image and Watermark Registration for Monochrome and Coloured Images,”Proc. DICTA'97,Dec. 1997, pp. 59-64.
Tirkel et al., “Image and watermark registration,”Signal Processing,vol. 66, May 1998, pp. 373-383.
Kutter, “Watermarking resisting to translation, rotation, and scaling,”Proc. SPIE vol. 3528: Multimedia Systems and Applications,Nov. 1998, pp. 423-431.
Maes et al., “Exploiting Shift Invariance to Obtain a High Payload In Digital Image Watermarking,”IEEE Proc. Int. Conf. on Multimedia Computing and Systems,Jun. 1999, pp. 7-12.

Affiliated with

Also associated with

Rating

Synchronizing watermark detectors in geometrically distorted... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Synchronizing watermark detectors in geometrically distorted..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronizing watermark detectors in geometrically distorted... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3499583