Method and system for achieving enhanced gray levels in a screen cell array
US6049395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1998 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Aug 31, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for digitally reproducing an image on a printing plate that includes enhancing gray levels so that plate may be imaged at lower resolutions and therefore higher speed. An image is scanned and a two dimensional array of optical density values. A comparison is made with a screen cell array having a repetitive pattern of a plurality of different screen cells. Each screen cells includes screen comparison values which when arranged in a sequence of increasing values are interleaved with values in a similarly arranged sequence of values from one of the different screen cells of the screen cell array. Pixel comparisons generate a binary value which is used to selectively operate a laser beam to expose microdots on a printing plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.