Full control multilevel error diffusion
US7518753B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 2005 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Apr 20, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for processing a digitized continuous tone image for reproducing the image by a printing device, including (a) inputting a tone value of an input pixel of the image; (b) applying a plurality of levelsplit curves to the tone value, thus obtaining a plurality of level values, wherein each specific levelsplit curve of the curves corresponds to a level defined by (i) a combination of a dot density and a dot area; or (ii) an overlap of a plurality of such combinations; (c) inputting the plurality of level values to an error diffuser for obtaining an output pixel value for reproducing the image; wherein a fraction of the output pixels to be filled by an overlap of levels depends on the level values and is independent of the error diffuser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.