Method and apparatus for detecting a watermark in a signal

Details Method and apparatus for detecting a watermark in a signal Method and apparatus for detecting a watermark in a signal

2004-11-24

2009-02-10

Ahmed, Samir A. (Department: 2624)

Image analysis

Applications

C382S232000, C382S240000, C713S176000, C713S179000, C713S194000, C386S349000, C348S461000, C348S463000, C380S054000, C726S022000

Reexamination Certificate

active

07489798

ABSTRACT:
The invention relates to a system for detecting a watermark using informed detection. A first signal potentially having a watermark embedded is received (601) as is a second signal corresponding to the original signal. The signals are segmented (605) into symbol segments. For each symbol segment a first characteristic is determined (607) for a first section and a second characteristic is determined (609) for a second section in response to the first and second signals in those sections. Specifically, ratios between average envelopes are determined. Thus, the first and second characteristic is indicative of the variations of the envelope during a watermark symbol. A watermark symbol estimate is determined (611) from the first and second characteristic. A sequence of estimated watermark symbols is compared to reference watermark symbols and the presence of a watermark symbol is determined (615) depending on the comparison. The invention is particularly suitable for improved detection of a multiplicative watermark.

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Aweke negash lemma et al “A temporal domain audio watermarking technique”, IEEE 2003, pp. 1088-1097.
Digital watermark for audio signal based on pdychoacoustic masking model, Nakayama et al, 2003.

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