Electronic high-fidelity screenless conversion system
US5331430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1991 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Oct 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system is disclosed for converting a continuous tone value to an output value having a first level or a second level. A first error magnitude is generated based upon continuous tone values already converted, continuous tone values not yet converted and an output value having the first level assumed for the continuous tone value undergoing conversion. A second error magnitude is similarly generated except that an output value having the second level is assumed for the continuous tone value undergoing conversion. If the first error magnitude is less than the second error magnitude, then the continuous tone value undergoing conversion is converted to the output value having the first level and, otherwise, the continuous tone value undergoing conversion is converted to the output value having the second level. The error corresponding to the converted lineary value is diffused in a predetermined manner to neighboring continuous tone values which have not yet been converted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.