Video compositing using a software linear keyer
US4827253A · kind A · utility
127Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Sep 26, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/275
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for compositing a graphic image with a background image to produce translucent effects identifies a key signal for each portion of the graphic image. The key signal is varied according to the amount of translucency desired for the graphics image from completely transparent to completely opaque. When the graphic image is mixed with the background image, the key signal is used to define the ratio of the graphic image to the background image at each part of the graphic image to produce a mixed image output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.