Half-tone dot generation
US6266079A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2215/0094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For pulsed marking systems, where the marking is dot by dot, a method is disclosed for finer rendition of marked edges and finer control of the size and shape of half-tone spots, whereby the position of dots at boundaries of marked areas are variable. In particular, while most dots are marked at regularly spaced grid points, boundary dots may be marked displaced by various amounts to either side of a grid point, thereby shrinking or expanding the marked area. Specific techniques for generating appropriate dot displacement, in conjunction with known half-tone screening methods, are disclosed. Apparatus for carrying out marking and screening by a pulsed marking device, with fine position control of the edge of marked areas, is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.