Method of and apparatus for deriving a key signal from a digital

Details Method of and apparatus for deriving a key signal from a digital Method of and apparatus for deriving a key signal from a digital

1994-09-09

1996-07-23

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Special effects

348584, H04N 5275, H04N 5272

Patent

active

055394752

ABSTRACT:
In deriving a key signal for a digital mixer from an input video signal, most values of the key signal are derived by a clip and gain circuit. However, in the special case where the normalized product values for adjacent pixels lie on opposite sides of the upper and lower bounds, the following equations are used to determine the key values (K.sub.i and K.sub.h) for the two adjacent pixels:

REFERENCES:
patent: 4533937 (1985-08-01), Yamamoto et al.
patent: 4771192 (1988-09-01), Jackson
patent: 4831447 (1989-05-01), Lake, Jr.
patent: 4920415 (1990-04-01), Chaplin
patent: 4949177 (1990-08-01), Bannister et al.
patent: 5043800 (1991-08-01), Snashall et al.
patent: 5142368 (1992-08-01), Pohl

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