Video key edge generator for increasing the size of an associated border, drop shadow and/or outline
US4392156A · kind A · utility
20Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1981 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | May 4, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/2622
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Conventional border, drop shadow and/or matte outline generating signals are selectively gated through an offset amplifier of less than unity gain and then fed back into the existing delay lines, to selectively modify the horizontal and vertical trailing edge of the waveform generated by the loop, which, in turn, modifies accordingly the selectively switched composite video signal, i.e., provides for selectively increasing the size and/or varying the configuration of the luminance key signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.