Method and apparatus for performing chroma key, transparency and fog operations
US5990903A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1997 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Feb 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for chroma keying filtered textures are provided. Chroma keying is performed which replaces the input texel color with a new color if the input texel color matches the chroma color. The chroma key circuitry keeps the input texel color and sets the alpha component to 1 if the input texel color does not match the chroma color. The chroma keyed texels are filtered using bilinear filtering. The color components of the filtered texels are fogged using a fog factor, a fog color, and the alpha component of the filtered texel. The fogged and filtered signal is blended with a background color to produce an output color for the texels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.