Video luminance self keyer
US4947255A · kind A · utility
20Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Sep 19, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/272
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved luminance video self keyer extracts a key signal from an unshaped input video signal as a function of a low and a high clip level. The input video signal is subsequently "shaped" as a function of the key signal and the low clip level. The result is a shaped video signal and an associated key signal that are combined with a secondary video signal without resorting to double multiplication of the input video signal by its associated key signal to produce a desired combination of the two video signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.