Chroma keyer with secondary hue selector

Details Chroma keyer with secondary hue selector Chroma keyer with secondary hue selector

1992-05-11

1993-10-05

Kostak, Victor R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 5275

Patent

active

052510166

ABSTRACT:
An improved chroma keyer has a secondary hue selector for chrominance suppression of "blue fringing" effects. The second hue selector provides a second chroma key signal from a foreground video signal, with the selected hue being offset from that of a primary hue selector. A matte generator having a hue corresponding to the hue of a backing in the foreground video signal is modulated as a function of the second chroma signal. The modulated hue from the matte generator is subtracted from the foreground video signal to produce a modified foreground video signal. The modified foreground video signal is converted into a shaped foreground video signal. The shaped foreground video signal is combined with a shaped background video signal to produce a composited output video signal. The shaped background video signal is a function of a background video signal and a primary chroma key signal from the primary hue selector.

REFERENCES:
patent: 4409611 (1983-10-01), Vlahos
patent: 4496960 (1985-01-01), Hausdorfer et al.
patent: 4713695 (1987-12-01), Macheboeuf

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