Halftone watermarking and related applications

G - Physics – 06 – K

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G06K 9/00 (2006.01) G06T 1/00 (2006.01) G09C 5/00 (2006.01) H04N 17/00 (2006.01)

Patent

CA 2422412

One method for halftone image watermarking assigns halftone watermark dot values to pseudorandom locations in an image and diffuses the error (106) of the watermark to neighboring pixel locations of these dots. Another method modulates halftone thresholds to convert multilevel pixels to watermarked halftone pixels. This method may be used in conjunction with a robust watermark (110) spread throughout image before embedding the halftone watermark. In a compatible watermark reader (124), digital watermark signal strength is measured by analyzing bit errors in the extracted watermark message signal.

L'invention concerne un procédé de filigranage d'image en demi-teintes consistant à assigner des valeurs de points de filigranage en demi-teintes à des emplacements pseudo-aléatoires dans une image, et à diffuser l'erreur (106) de filigranage aux emplacements de pixel voisins de ces points. Un autre procédé consiste à moduler des seuils de demi-teintes afin de convertir des pixels à multiples niveaux en pixels à demi-teintes filigranés. Ce procédé peut être utilisé conjointement avec un filigrane robuste (110) étalé sur l'image avant d'intégrer le filigrane à demi-teintes. Dans un lecteur (124) de filigrane compatible, la force du signal de filigrane numérique est mesurée par analyse des erreurs de bit du signal extrait du message filigrané.

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