Stochastic screens for printing
US6833933B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 2000 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | May 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4051
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of generating a stochastic screen for use in printing a halftone containing image on a surface, where the generated stochastic screen comprises an array of threshold values each of which represents a halftone threshold at which pixels are printed at the corresponding location. The method comprises a) entering a first threshold value into the array and b) for a first halftone level, defining a number of threshold values to be entered into the array and, for each threshold value to be placed, for each of a number of candidate locations in the array, computing a distance function between the candidate location and the locations of threshold values already placed into the array, and placing the threshold value into the array at a location for which the distance function is substantially minimized. The process of step b) is then repeated for each subsequent halftone level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.