Chroma-key signal generator

H - Electricity – 04 – N

Patent

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350/41

H04N 1/04 (2006.01) H04N 9/75 (2006.01)

Patent

CA 1195766

Abstract of the Disclosure 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 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.

413835

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