Optical-diffusion correcting device for a television camera tube
US4661852A · kind A · utility
1Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1985 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Jan 17, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/81
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Television camera lenses cover a field which is larger than the useful field to be televised. Defects appear in the useful image as a result of diffusion of light from the portion of the image which is not intended to be televised or in other words the peripheral portion. The device for correcting peripheral diffusion comprises scanning and processing means for scanning a band located on the target around the image to be televised and for supplying a diffusion-correcting signal which is representative of a mean value of the band-scanning signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.