Chroma key switching signal generator

Details Chroma key switching signal generator Chroma key switching signal generator

H - Electricity

04

N

350/42, 350/53

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

Patent

CA 1169545

ABSTRACT OF THE DISCLOSURE A wideband chroma key switching signal is generated from lower bandwidth chrominance signals in a video signal by first conventionally generating a chroma key switching signal from these chrominance signals, and then detecting high frequency transition components in the corresponding luminance signal. These luminance signal high frequency components are then added to the switching signal in a manner that insures that their polarities match, thereby generating a higher bandwidth chroma key switching signal. This resultant higher bandwidth chroma key switching signal is used to control cross fade amplifiers which function to output either the video signals of a first or a second scene with linear transitions between these video signals during switching.

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