Digital watermark burying method and device, and digital...

Details Digital watermark burying method and device, and digital... Digital watermark burying method and device, and digital...

H - Electricity

04

N

H04N 7/08 (2006.01) G06T 1/00 (2006.01) H04N 1/32 (2006.01) H04N 1/387 (2006.01) H04N 5/913 (2006.01) H04N 7/025 (2006.01) H04N 7/035 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2414231

A specific frequency extraction unit (11) extracts a specific frequency component signal from an input image signal (10), a phase controller (12) and amplitude controller (13) control at least one of the phase and amplitude of the specific frequency component signal in accordance with watermark information, and a watermark information superposition unit (16) superposes the specific frequency component signal on the input image signal to generate an image signal embedded with the watermark information.

Un signal à composante fréquentielle spécifique est extrait d'un signal image d'entrée (10) par une unité d'extraction de composante fréquentielle préétablie (11), l'un au moins des deux éléments que sont la phase et l'amplitude du signal à composante fréquentielle spécifique étant commandé conformément à des informations relatives à un filigrane par une unité de commande de phase (12) et une unité de commande d'amplitude (13). Un signal image auquel sont intégrées des informations relatives au filigrane est généré par superposition du signal à composante fréquentielle spécifique sur le signal image d'entrée par une unité de superposition des informations relatives au filigrane (16).

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