Color television camera with a single image pickup tube featuring improved rendition of bright monochromatic objects
US4559554A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Sep 21, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a color television camera of the type having a single image pickup tube with red, green and blue stripe filters for providing an electrical signal indicative of the image of an object, a luminance signal is separated by a low pass filter from the electrical signal, and a chrominance signal is also separated therefrom. A color difference signal is derived from the chrominance signal and is mixed with the luminance signal such that the polarity of the color difference signal is inverted relative to the luminance signal and a magnitude of the color difference signal is adjusted by a predetermined amount. The corrected luminance signal and a carrier chrominance signal are then combined to form a composite color video signal. A noise eliminating circuit is provided for improving the signal to noise ratio of the color difference signal used to correct the luminance signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.