Watermarking of digital image data

Details Watermarking of digital image data Watermarking of digital image data

H - Electricity

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H04K 1/00 (2006.01) G06T 1/00 (2006.01) G09C 5/00 (2006.01) H04L 9/00 (2006.01) H04N 1/32 (2006.01) H04N 7/26 (2006.01) H04N 7/46 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2308402

Digital watermarks can serve to indicate copyright ownership of digitized video. When video images are transmitted as transformed by discrete cosine transformation (DCT) for compression, with or without motion compensation, it is advantageous to include a watermark after transformation. To this end, a DCT watermark is generated for optimal visibility based on the original image data, and the generated watermark is superposed on the transformed data.

Des filigranes numériques peuvent servir à indiquer la propriété d'un droit d'auteur sur des vidéos numérisées. Lors de la transmission d'images vidéo transformées par une transformation en cosinus discrets (DCT) en vue de leur compression, avec ou sans compensation de mouvement, il est avantageux d'inclure un filigrane après transformation. Pour ce faire, on produit un filigrane DCT en vue d'une visibilité optimale à partir des données originales d'image, et le filigrane produit est superposé aux données transformées.

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