Method and apparatus for compositing video images
US5343252A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1993 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Apr 15, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus to improve the control signal E.sub.c used in a video image compositing system so that the adjustment to achieve an E.sub.c of just zero for green objects and flesh tones, does not simultaneously reduce E.sub.c in grey scale subjects and cause print-through. The invention also reproduces a wide range of blue colors from pale blue to bright blue in the presence of a blue backing without raising a matte density control and without raising noise level. The invention also provides a second control signal, E.sub.k, that eliminates backing color spill from blond and brown hair, without affecting bright foreground white tones. The invention also generates a SHADOW CLEAN-UP signal that eliminates foreground shadows, while preserving most of the foreground detail information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.