Techniques of imperceptibly altering the spectrum of a...

H - Electricity – 04 – N

Patent

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H04N 5/913 (2006.01)

Patent

CA 2503835

Copying of visual images by electronic devices is discouraged by metamerically altering the relative weights of the color components forming the visual images in a manner that is not perceptible to the human eye (70) but which is perceptible in the copy (90). In a preferred technique, the visual images are represented by more than three primary color components whose relative values are varied in this manner. A primary application is to discourage copying by video cameras of movies displayed on theater movie screens, by causing the copies to contain unacceptable spatial or temporal variations in colors perceived by the human eye (70).

Selon l'invention, la copie d'images visuelles par des dispositifs électroniques est dissuadée par altération métamérique de l'importance relative des composantes des couleurs qui forment les images visuelles, d'une manière imperceptible par l'oeil humain mais perceptible dans la copie. Dans une technique préférée, les images visuelles sont représentées par plus de trois composantes de couleurs primaires dont les valeurs relatives sont modifiées de cette manière. Une application primaire est destinée à dissuader la copie par des caméras vidéo de films diffusés sur des écrans de cinéma et consiste à altérer le contenu des copies au moyen de variations, non désirées et perceptibles par l'oeil humain, des couleurs dans le temps et dans l'espace.

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