Screening method for a rendering device having restricted density resolution
US5654808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1994 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Jul 6, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is described for the rendering of an image on a carrier by a rendering system having a restricted density resolution. A classic screening method for a binary rendering technique is extrapolated to a plurality of energy levels that belong to three classes: non-marking, non-stable and marking stable energy levels. For each class, specific rules must be respected, in order to obtain predictable results without density discontinuities on the carrier. The methods make full use of the spatial and density resolution of the rendering system in areas of high density and increase the reproducibility of low densities by giving up some spatial resolution in the lower density regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.