Watermark incorporation

G - Physics – 10 – L

Patent

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Details

G10L 19/00 (2006.01) H04H 20/86 (2009.01) H04L 9/32 (2006.01)

Patent

CA 2564981

According to an inventive scheme for introducing a watermark into an information signal, the information signal (12) is at first transferred from a time representation (22) to a spectral/modulation spectral representation (30). The information signal is then manipulated in the spectral/modulation spectral representation (30) in dependence on the watermark 114) to be introduced to obtain a modified spectral/modulation spectral representation, and subsequently an information signal provided with a watermark (16) is formed based on the modified spectral /modulation spectral representation. An advantage is that, due to the fact that the watermark (14) is embedded and/or derived in the spectral /modulation spectral representation or range, traditional correlation attacks as are used in watermark methods based on a spread-band modulation cannot succeed easily.

Selon le procédé de l'invention, qui sert à intégrer un filigrane à un signal d'informations, le signal d'informations (12) est tout d'abord converti d'une représentation temporelle (22) à une représentation spectrale de modulation/spectrale (30). Le signal d'informations est ensuite manipulé dans sa représentation spectrale de modulation/spectrale (30) en fonction du filigrane à insérer (14), afin de produire une représentation spectrale de modulation/spectrale modifiée, puis un signal d'informations (16) marqué d'un filigrane est formé sur la base de la représentation spectrale de modulation/spectrale modifiée. L'invention présente l'avantage que grâce au fait que le filigrane (14) est intégré ou dérivé de la représentation spectrale de modulation/spectrale ou de domaines correspondants, des effractions de corrélation traditionnelles qui interviennent dans les procédés de marquage par filigrane basés sur la modulation à étalement de spectre, n'atteignent tout simplement pas leur cible.

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