Television chroma-key systems

Details Television chroma-key systems Television chroma-key systems

1981-09-22

1983-10-04

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

044082215

ABSTRACT:
Chroma-key system combining an image of a foreground subject located in front of a colored backing, with a background image, in which limitations on the permissible colors of the foreground subject are reduced; and in which the chrominance and luminance of areas having the backing color in the foreground image are suppressed to prevent their undesired appearance in the combined image; and in which transitions in the signal indicating presence of the backing color are sharpened while maintaining amplitude proportionality to compensate for bandwidth limitation of the chrominance signal from which this indicating signal derives; and in which transitions in the chrominance component of the foreground signal at boundaries between subject and backing are similarly sharpened; and in which the luminance component of fine detail located in front of the backing is combined with the backing color indicating signal to include such fine detail in the combined image.

REFERENCES:
patent: 3560638 (1971-02-01), Skrydstrup
patent: 3595987 (1971-07-01), Vlahos
patent: 3778542 (1973-12-01), Hanseman
patent: 4007487 (1977-02-01), Vlahos

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