Halftone image processing method
US4698691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1984 |
| Grant date | Oct 6, 1987 |
| Priority date | — |
| Expiry date | Nov 26, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A halftone image processing method for providing image information in a bit distribution by specifying a matrix pattern in response to tone data which is indicative of a recording density. Several matrix pattern groups are prepared each comprising matrix patterns which are larger in number than dots which define a dot matrix. The matrix pattern groups are provided with density characteristics different from each other. One of the groups is specified in conformity to a required density characteristic, while one of the matrix patterns in the specified group is specified in response to tone data. Any one of various modes of tone representation is selectable and, in addition, numerous tones may be rendered to enhance smooth representation of tones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.