System and method of retrieving a watermark within a signal

Details System and method of retrieving a watermark within a signal System and method of retrieving a watermark within a signal

2006-10-31

2006-10-31

Sheikh, Ayaz (Department: 2136)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C380S282000, C380S252000

Reexamination Certificate

active

07131007

ABSTRACT:
A system and method of retrieving a watermark in a watermarked signal are disclosed. The watermarked signal comprises odd and even overlapped blocks where the watermark is contained in the even blocks. The method comprises, for each k-th even block, subtracting the two adjacent odd blocks from the k-th even block of the watermarked signal to retrieve {overscore (s)}*k(n), transforming {overscore (s)}*k(n) into the frequency domain to generate {overscore (S)}k(f), calculating a phase of {overscore (S)}k(f) as {overscore (φ)}(f) and a phase of Sk(f) as φ(f), calculating the difference Ψ(f) between {overscore (φ)}(f) and φ(f), unwrapping Ψ(f) to obtain the phase modulation {tilde over (Φ)}k(f), and using a Viterbi search to retrieve the watermark embedded in {tilde over (Φ)}k(f).

REFERENCES:
patent: 5384811 (1995-01-01), Dickopp et al.
patent: 5905800 (1999-05-01), Moskowitz et al.
patent: 6209094 (2001-03-01), Levine et al.
patent: 6219634 (2001-04-01), Levine
patent: 6252685 (2001-06-01), Yokochi
patent: 6345100 (2002-02-01), Levine
patent: 6389574 (2002-05-01), Belveze et al.
patent: 6449304 (2002-09-01), Holmes et al.
patent: 6557103 (2003-04-01), Boncelet et al.
patent: 6567780 (2003-05-01), Rhoads
patent: 6674876 (2004-01-01), Hannigan et al.
patent: 6694041 (2004-02-01), Brunk
patent: 6704431 (2004-03-01), Ogawa et al.
patent: 6718309 (2004-04-01), Selly
patent: 6760438 (2004-07-01), Hui et al.
patent: 6778678 (2004-08-01), Podilchuk et al.
patent: 6879652 (2005-04-01), Srinivasan
patent: 2005/0108542 (2005-05-01), Kirovski et al.
Davis Pan, “A Tutorial on MPEG/Audio Compression” Oct. 7, 1996, IEEE.
“Analysis of Attacks on SDMU Audio Watermarks,” by M. Wu, et al.ICASSP Proceedings, vol. III of VI Image&Multidimensional Signal Processsing, Multimedia Signal Processing, May 7-11, 2001, Salt Lake City, Utah, USA.
“Advanced Watermarking and Its Applications,” by C. Neubauer, et al., 109thAES Convention, Los Angeles, Sep. 2000.
“MPEG Audio Coding” by J. Johnston, et al., inWavelet, Subband and Block Transforms inCommunications and Multimedia(A. N. Akansu and M. J. Medley, eds.) Ch. 7, pp. 207-253, Kluwer Academic Publishers, 1999.
“Psycho-acoustics, Facts and Models”, by E. Zwicker and H. Fastl, Springer, 2 ed., 1999.
“Digital Watermarks for Audio Signals,” by L. Boney, et al.,IEEE Int. Conf. on Multimedia Computing and Systems, Hiroshima, Japan, pp. 470-480, 1996.
“Echo Hiding,” by D. Gruhl, et al.,Proceedings of the Workshop on Information Hiding, First International Workshop, Cambridge, U.K., Springer-Verlag, May/Jun. 1996.
“Digital Communications,” by J. G. Proakis, McGraw-Hill, 1983.

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