Watermarking an information signal

H - Electricity – 04 – L

Patent

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Details

H04L 9/32 (2006.01) G06T 1/00 (2006.01) H04N 1/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2271042

A method and arrangement for detecting a multi-bit watermark in a signal (e.g. a video image) are disclosed. Each bit of the multi-bit value is represented by an embedded watermark subpattern in the signal. Instead of detecting in a conventional manner the presence of each individual subpattern (i.e. detecting each individual bit), the detection comprises the steps of: detecting (24, 23) the presence of the full watermark in the signal irrespective of its multi-bit value, and detecting (25) to which extent the presence of subpatterns corresponds with the multi-bit value to be checked. The reliability of watermark detection is hereby improved.

Procédé et dispositif pour la détection d'un filigrane multibit dans un signal (ex. une image vidéo). Chaque bit de la valeur multibit est représenté par un sous-motif de filigrane inclus dans le signal. Au lieu de détecter de manière classique la présence de chaque sous-motif séparé (c.a.d. de détecter chaque bit séparé), la détection consiste à détecter (24, 23) la présence du filigrane intégral dans le signal quelle que soit la valeur multibit, et à détecter (25) dans quelle mesure la présence du sous-motif correspond à la valeur multibit à vérifier. La fiabilité de la détection de filigrane est ainsi améliorée.

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