Patent ID: 8649060
Filing Date: 2014-02-11
Classification: G06K,H04N

Abstract:
1. A method of printing a continuous tone image by a printer having an asymmetric printer resolution, said method comprising the steps of: a) multi-level halftoning the continuous tone image by assigning a level out of a number of levels to each pixel of the image; b) determining the number of levels on the basis of the asymmetric printer resolution; c) selecting for each level a collection of at least one binary pattern, each binary pattern consisting of a plurality of sub-pixels, the number of which is determined by the number of levels; d) selecting for each pixel of the halftoned image a binary pattern from the collection selected for the level assigned to the pixel; e) transforming each pixel of the halftoned image into the selected binary pattern; and f) printing the binary patterns of the transformed pixels using the asymmetric printer resolution, wherein the binary pattern is different for pixels of the halftoned image corresponding to the same level, and wherein the method further includes selecting a first binary pattern of a level of the number of levels for even pixels of the halftoned image to be different than a second binary pattern of the same level for odd pixels of the halftoned image.