Chroma processor including a look-up table or memory
US5313275A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1992 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Sep 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video systems generally include chroma processors. The chroma processor may be configured as a chroma keyer, a key signal generator or a color collector. The chroma processor includes dual input look-up tables which are loaded by a central processor. The dual input look-up tables may be read and written to simultaneously. The look-up tables are addressed by chrominance signals, luminance signals or key signals input into the chroma processor. The look-up tables provide an exceptionally fast apparatus and exceptionally flexible method of keying one or more simultaneous regions of the display based on one or more unique chroma/luma combinations, new key signals, chrominance signals, and luminance signals. The chroma processor receives color modification parameters from a software user interface. Preferably, the chroma processor utilizes Y luminance signals, and U and V chrominance signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.