Field-based watermark insertion and detection

Details Field-based watermark insertion and detection Field-based watermark insertion and detection

G - Physics

06

K

G06K 9/00 (2006.01) G06T 1/00 (2006.01)

Patent

CA 2321034

A digital watermark is inserted into multimedia data (102) containing two image fields (106, 108) by placing a positive watermark into a first field (110) and a negative watermark into a second field (112). The positive watermark and negative watermark are opposite of one another. The two fields can be interlaced fields of a field-based video signal or alternate rows of a frame-based video signal. The watermark is extracted from field-based watermarked data (120) by separating the watermarked data (120) into two fields and subtracting one of the fields from the other field to generate a watermarked signal. The resultant watermarked signal is processed in a conventional manner to extract and detect the watermark.

Cette invention concerne un filigrane numérique que l'on insère dans des données multimédia (102) contenant deux champs d'images (106, 108), ceci en plaçant un filigrane positif dans un premier champ (110) et un filigrane négative dans un second champ (112). Le filigrane positif et le filigrane négatif sont opposés l'un à l'autre. Les deux champs peuvent consister en des champs entrelacés d'un signal vidéo à base de champs, ou en des rangées alternées d'un signal vidéo à base de trames. Le filigrane est extrait des données marquées par filigrane à base de champ (120) en séparant lesdites données marquées (120) en deux champs, et en soustrayant un champ de l'autre de manière à produire un signal marqué par filigrane. Le signal marqué ainsi obtenu est traité de manière traditionnelle afin d'extraire et de détecter le filigrane.

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