Method and apparatus for scanning masters
US4568984A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1983 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | May 24, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4097
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A novel apparatus and method for point-to-point and line-by-line opto-electronic scanning of masters mounted on a transparent master carrier and wherein simultaneous opaque and transparency scanning is accomplished to generate opaque and transparency scanning signals for each point of the master with one of the scanning signals being the actual image signal and the other scanning signal being a recognition signal for those points of the master where amplitude errors in the image signal occur due to scattered light and/or shadowing. The disruptive amplitude errors are eliminated by combining the recognition signal with the actual image signal to obtain a substantially error-free signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.