Method of and apparatus for producing halftone dot film of gradated density distribution
US4635131A · kind A · utility
7Cited by
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16Claims
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Key dates
| Filing date | Oct 9, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Oct 9, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an electronic image reproduction system, a halftone dot film of a density distribution of a specific pattern is produced by obtaining a value l expressed by an equation l=f(x)+g(y) representative of the specific pattern corresponding to the density value. By superimposing a density signal corresponding to the value l on an image signal developed by scanning an original, a reproduction image of the original, modulated by the density signal of a specific pattern, is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.