Shading correction device
US4524388A · kind A · utility
19Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1982 |
| Grant date | Jun 18, 1985 |
| Priority date | — |
| Expiry date | Aug 6, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A shading correction device wherein in advance to the reading of the document image, shading correction coefficients are obtained from optic information from uniform reflecting surface and stored in a memory element such as RAM, and correcting the picture signal in accordance with the content of the memory element when the document is read.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.