A scaling independent technique for watermarking images

Details A scaling independent technique for watermarking images A scaling independent technique for watermarking images

H - Electricity

04

N

H04N 7/26 (2006.01) G06T 1/00 (2006.01)

Patent

CA 2379992

A robust technique to prevent illicit copying of video information notwithstanding the use of image scaling is presented. A watermark is embedded into the video signal at different scales (i.e., sizes). The watermark is maintained at each scale for a predetermined time duration that is sufficient to allow the detector circuit in a digital format recorder to detect, extract, and process information contained in the watermark. At the end of the predetermined time duration, the watermark is changed to a different scale preferably on a pseudo-random basis to ensure that each one of all the scales in a predetermined scaling range is achieved a predetermined number of times. In this way, a particular scale that has the counter effect of restoring the watermark to its original position and size can be identified and used to allow the watermark to be detected.

L'invention concerne une technique robuste destinée à empêcher la copie illégale d'informations vidéo, sans qu'il soit tenu compte de la mise à l'échelle de l'image. Un filigrane est incorporé à un signal vidéo. Ce filigrane est maintenu à chaque échelle pendant une durée déterminée qui est suffisante pour permettre à un circuit détecteur de détecter, extraire et traiter les informations contenues dans le filigrane. A la fin de cette durée, on modifie l'échelle du filigrane, de préférence, de façon pseudo-aléatoire, afin de s'assurer que l'on a atteint chacune des échelles comprise dans un intervalle d'échelle déterminé, un certain nombre de fois. Ainsi, on peut identifier et utiliser une échelle particulière qui a le contre-effet de rétablir le filigrane à sa position et à ses dimensions d'origine, afin de permettre la détection du filigrane.

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