Method and apparatus for halftoning and inverse halftoning...

H - Electricity – 04 – N

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H04N 1/405 (2006.01) H04N 1/21 (2006.01) H04N 1/40 (2006.01) H04N 1/41 (2006.01)

Patent

CA 2133558

A method for obtaining the inverse halftone or gray scale image of a halftone image is disclosed in which the halftone image can be comprised of clustered dots or dispersed dots, and it is not necessary to have knowledge of the screening methods or parameter. This method involves adaptive run-length filtering over at least one of rows and colums and diagonals of said halftones. A method for transmitting and receiving a gray scale image in a compressed and decompressed manner, respectively, is also disclosed for efficient facsimile transmission of images. This method involves transmitting a local mean continuous tone image and an error image.

Méthode pour obtenir l'image inverse ou en échelle de gris d'une image en simili dans laquelle l'image peut comprendre des points de trame groupés ou dispersés, et où il n'est pas nécessaire de connaître les méthodes ou les paramètres de production de trame. Cette méthode comprend le filtrage adapté par longueur de ligne sur au moins une rangée, une colonne, une diagonale de ces images en simili. Une méthode pour émettre et recevoir une image en échelle de gris en mode compressé et décompressé, respectivement, est également présentée pour la télécopie des images. Cette méthode comporte la transmission d'une image en dégradé en valeur moyenne locale et d'une image erronée.

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