Encoded signal color image compositing

Details Encoded signal color image compositing Encoded signal color image compositing

H - Electricity

04

N

350/41

H04N 9/535 (1980.01) H04N 9/32 (1980.01)

Patent

CA 1179051

ABSTRACT A linear color television compositing system of the "blue backing" type, in which the foreground signal channel is always open. The foreground and background channels are not switched by the edges of the pictorial subject matter. The hue of the colored (typically blue) background is removed by vector subtraction and the luminance thereof by arithmetic subtraction. Flare illumina- tion of the foreground subject(s) from the backing is removed; improving color fidelity. The background pictorial scene that takes the place of the removed colored backing area is linearly turned up or down, allowing shadows of fore- ground subjects to appear in the background.

429718

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