Positive feedback error diffusion signal processing

Details Positive feedback error diffusion signal processing Positive feedback error diffusion signal processing

G - Physics

09

G

G09G 5/36 (2006.01) G06T 1/00 (2006.01) G06T 5/00 (2006.01) H04N 1/405 (2006.01) H04N 1/41 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2063879

A method for processing signals to diffuse quantization error spatially or temporally. Positive feedback of the quantization error is used to reduce the relative noise for the low frequencies of the spectrum. According to a preferred implementation in a two-dimensional spatial application involving a base pixel and three adjacent orthogonally arranged pixels, error attributable to quantization at the base pixel location is provided as positive feedback for the quantization of the diagonally adjacent pixel. Offsetting and complementary values of the quantization error are also diffused to the remaining two diagonally positioned pixels. The composite of the four pixels forms a square with a zero net error diffusion along the horizontal, vertical and diagonal orientations.

Méthode de traitement de signaux permettant de diffuser une erreur de quantification dans le temps ou dans l'espace. On se sert d'une rétroaction positive de l'erreur de quantification pour réduire le bruit relatif des fréquences basses du spectre. Dans une implantation préférée de cette méthode à une application bidimensionnelle, où un pixel de base est entouré de trois pixels orthogonaux et adjacents, une erreur de quantification à l'emplacement du pixel de base fournit une rétroaction positive à la quantification du pixel adjacent en position diagonale, des valeurs complémentaires et de décalage de cette erreur de quantification étant également transmises aux deux autres pixels diagonaux. La composée des quatre pixels forme ainsi un carré dont l'erreur de diffusion nette est nulle suivant les axes horizontal, vertical et diagonal.

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