Chroma keying system
US4319266A · kind A · utility
33Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1980 |
| Grant date | Mar 9, 1982 |
| Priority date | — |
| Expiry date | Dec 19, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A chroma keying system which prevents the production of a chroma key signal when the primary color signals are equal is described. This system effectively prevents chroma keys on monochrome portions of color foreground camera signals. These monochrome portions are typically caused by uneven studio lighting and the resulting shadows and reflections. The system includes a comparator which compares the R, G, and B signals and generates an inhibit signal therefrom. This inhibit signal is then used to prohibit the generation of a chroma key signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.