Color printer halftoning method and apparatus
US6373594B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1998 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Dec 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color printing system with a data storage medium containing a first data set corresponding to a first halftone screen having a first screen matrix of threshold values. The first screen matrix has screen locations corresponding to the matrix of image data elements, and each screen location has a threshold value selected from a range of threshold values. The data storage medium includes a second data set corresponding to an second halftone screen having a second screen matrix of threshold values, each inversely related to the corresponding threshold value of the first screen. The data storage medium includes a third data set corresponding to a third halftone screen having a third screen matrix of threshold values each based on a difference between the first screen value for the corresponding location and a preselected intermediate value in the range of threshold values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.