Method and apparatus for performing chroma key, transparency and

Details Method and apparatus for performing chroma key, transparency and Method and apparatus for performing chroma key, transparency and

1997-02-03

1999-11-23

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

345435, G06T 1500

Patent

active

059909030

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.

REFERENCES:
patent: 4645459 (1987-02-01), Graf et al.
patent: 5621869 (1997-04-01), Drews
patent: 5740343 (1998-04-01), Tarolli et al.
patent: 5754185 (1998-05-01), Hsiao et al.
patent: 5793427 (1998-08-01), Mills et al.
patent: 5798767 (1998-08-01), Poole et al.

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