Generation of a switching signal for the chroma keying of color

Details Generation of a switching signal for the chroma keying of color Generation of a switching signal for the chroma keying of color

1974-11-20

1976-05-25

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

178DIG6, H04N 522

Patent

active

039598136

ABSTRACT:
Generation of a switching signal for the chroma keying of color video signals, in which generation the voltage level of the switching signal becomes a maximum for a selected hue. The switching signal corresponds, when an adjustable voltage level is exceeded, to a specific color saturation of the selected hue. This generation is carried out by means of a first and a second color difference signal derived from primary signals of a color signal source, and by means of a sine-shaped and cosine-shaped variable control signal, the variation of which is a function of the angle of the selected hue in a color spectrum. In this generation, the first color difference signal is multiplied by the sine-shaped control signal, and the second color difference signal is multiplied by the cosine-shaped control signal, and the multiplied signals are added to a first signal component.

REFERENCES:
patent: 3371160 (1968-02-01), Hurford
patent: 3678182 (1972-07-01), Boxman et al.
patent: 3778542 (1973-12-01), Hanseman

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