Chroma-key signal generator

Details Chroma-key signal generator Chroma-key signal generator

1982-10-19

1985-03-19

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, A04N 9535

Patent

active

045062897

ABSTRACT:
A chroma-key signal generator is provided which may be utilized to effect an electronic insertion of a picture into another picture, by utilizing a color television signal. The generator includes a first color selection/clip circuit which selects any desired hue signal from three primary color signals and clips it at a given level to provide a first key signal, a second color selection/clip circuit which selects a hue signal of a different hue from the first mentioned hue signal, from the three primary color signals, and clips it at a given level to provide a second key signal, and a logical and arithmetic circuit which logically operates on the first and the second key signal to provide an output signal which is utilized as a key signal.

REFERENCES:
patent: 4394680 (1983-07-01), Watanabe

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