Error diffusion of overlapping dots
US5087981A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Jan 2, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for converting gray-scale pixel information into data for rendering dots by a printer, video display, or similar device. A form of error diffusion is used wherein a thresholding error produced during the conversion process for a particular dot is propagated to one or more adjacent dots. The propagated error modifies the comparisons made for the adjacent dots and can be converted into lightness space to linearize the error. The error itself is modified when there is overlap of the propagating dot with an adjacent dot. The overlap modification is dependent upon the density levels being rendered and the amount of overlap between the dots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.