Technique for simulating film grain using frequency filtering

Details Technique for simulating film grain using frequency filtering Technique for simulating film grain using frequency filtering

H - Electricity

04

N

H04N 7/26 (2006.01)

Patent

CA 2538832

Simulation of film grain in an image can occur by compressing a video image, then transmitting compressed video together with a message containing at least one parameter indicative of the original film grain, to a decoder, and restoring the original grainy appearance of images by having the decoder simulating film grain based on the content of the film grain message. To improve efficiency, one or more parameters of film grain information undergo scaling in accordance with a target pixel block size for pixel blocks in the image. Such scaling allows for the use of conventional circuitry for performing block-based operations in connection with the film grain simulation.

L'invention concerne la simulation de grain de film dans une image pouvant intervenir par compression d'image vidéo, puis transmission d'image vidéo comprimée avec un message contenant au moins un paramètre indiquant le grain de film original vers un décodeur, et enfin rétablissement de l'apparence de grain original des images par simulation, au décodeur, du grain de film sur la base du contenu du message. Pour améliorer l'efficacité, on étalonne un ou plusieurs paramètres d'information de grain de film selon une taille de bloc de pixels cibles pour les blocs de pixels dans l'image. Cet étalonnage permet d'utiliser des circuits classiques pour les opérations reposant sur les blocs en liaison avec la simulation de grain de film.

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