Method and circuit for generating a composite video signal

Details Method and circuit for generating a composite video signal Method and circuit for generating a composite video signal

1995-09-13

1997-07-01

Lee, Michael

Television

Image signal processing circuitry specific to television

Special effects

348590, 348595, H04N 974

Patent

active

056443650

ABSTRACT:
A method and a circuit for generating a composite video signal formed from a foreground signal and a background signal in accordance with the luminance self-key mode is described, in which the key signal is derived from the luminance foreground signal in dependence upon a clipping level. To avoid a quadratic dependence of the luminance signal during product formation of the key signal with the foreground signal (referred to as "double multiplication"), the linear key signal should be replaced by a control signal which is hyperbolically formed in such a way that the unwanted quadratic dependence is eliminated.

REFERENCES:
patent: 4920415 (1990-04-01), Chaplin
patent: 4947255 (1990-08-01), Jackson et al.
patent: 5303041 (1994-04-01), Nishimura
patent: 5386242 (1995-01-01), Chaplin
patent: 5416529 (1995-05-01), Lake
"Digital Keyers in Video Switches and Effects Systems", by Richard S. Bannister, SMPTE Journal, Mar. 1991, pp. 178-181.

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