System and method for reducing artifacts in images

G - Physics – 06 – T

Patent

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G06T 5/00 (2006.01) H04N 5/357 (2011.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2674310

A system and method of the present disclosure provides a block, or region, based error diffusion process for reducing artifacts in images. The system and method allows for the generation and the control of the spatial frequency of a masking signal, e.g., noise, in a way that it can be easily passed through the compression process. The system and method provides for selecting a block size of pixels of the image (204), adding a masking signal to the image (205), determining a quantization error for at least one block in the image (208), and distributing the quantization error to neighboring blocks in the image to mask artifacts in the image (212). An output image is then encoded with a compression function (214).

La présente invention concerne un système et un procédé qui permettent un traitement de diffusion d'erreur basé sur un bloc ou une région, pour réduire les artefacts dans les images. Le système et le procédé permettent la génération et la commande de la fréquence spatiale d'un signal de masquage, par exemple, le bruit, d'une manière telle qu'il peut être amené à passer facilement à travers le traitement de compression. Le système et le procédé permettent la sélection d'une dimension de bloc de pixels de l'image (204), l'ajout d'un signal de masquage à l'image (205), la détermination d'une erreur de quantification pour au moins un bloc dans l'image (208), et la distribution de l'erreur de quantification à des blocs voisins dans l'image pour masquer les artefacts dans l'image (212). Une image de sortie est ensuite codée avec une fonction de compression (214).

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