CCD Imager
US4351004A · kind A · utility
17Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Jan 31, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A CCD imager is provided with an adaptive threshold circuit. The variations in the illumination across the document being read by the imager are compensated for by the adaptive threshold circuit to accurately provide an accurate digital representation of the image on the document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.