Digital halftoning with dots representing a spiral
US11568189B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2019 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | Apr 30, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M1/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A halftone raster image, suitable for rendering a continuous-tone image, which comprises a plurality of dots, arranged according a screen ruling and screen angle. Said dots comprise (i) image pixels arranged as a first arc or as a plurality of arcs which together represent a first spiral, and (ii) non-image pixels arranged as a second arc or as a plurality of arcs which together represent a second spiral. Small displacements of the feed point of said dots away from the theoretical centre of a halftone dot, defined by said screen ruling and screen angle, enable a higher image quality and less patterns in said halftone raster image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.