Digital halftoning with error diffusion
US6307647A · kind A · utility
11Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1995 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | May 5, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An error diffusion halftoning technique calculates only two error terms with one being divisible by two and the other being divisible by four. This is accomplished through using a modified Floyd and Steinberg type filter preferably having weights of 8-0-4-4 expressed in clockwise sequence from the origin. The direction of scanning is preferably reversed each scan line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.