Self keyer

Details Self keyer Self keyer

1989-03-20

1990-04-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, H04N 5272

Patent

active

049204157

ABSTRACT:
An improved self keyer preconditions a fill video prior to mixing with a background video under control of a self key signal derived from the fill video. A variable gray luminance signal is substituted for low luminance portions of the fill video under control of a precondition key signal derived from the self key signal to produce the preconditioned fill video. The resulting output video has a smooth luminance transition between the fill and background videos in lieu of an unpleasant black artifact at the edges of the fill video.

REFERENCES:
patent: 3970774 (1976-07-01), Bazin et al.
patent: 4689681 (1987-08-01), Jackson
patent: 4743970 (1988-05-01), Barnett et al.
patent: 4771192 (1988-09-01), Jackson
patent: 4800432 (1989-01-01), Barnett et al.
patent: 4811104 (1989-03-01), Kawabe

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