Image reproduction systems providing reproduction at a finer pitch than input scanning
US3956583A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1975 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Apr 30, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40068
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system for producing screened images, for each set of image-representing signals derived from one rotation of an input scanner cylinder, n sets of screen-representing densities are derived corresponding to screen densities of parallel tracks each of which has a width which is a fraction of the screen pitch. The set of image-representing signals for a line of the image is modified n successive times as a function of the n respective sets of screen-representing densities and each of the n sets of screen-modified image-representing signals is applied in turn to modulate a single output element in an output scanner in which the scanning beam scans the image-reproducing area at a pitch that is n times finer than that of the input scanner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.