Combining digital video key signals

Details Combining digital video key signals Combining digital video key signals

1991-09-20

1994-04-19

Kostak, Victor R.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

348584, 348578, H04N 5262

Patent

active

053051076

ABSTRACT:
A mixer for combining digital video signals allows four real-time signals to be combined. At each layer, a digital key signal may be generated from the input video signal using chroma or luminance keying. In addition, the video signal may be combined with drop shadows, a border and a fill to produce first-stage composite video and composite key signals. A composite key signal is produced by supplying two key signals to a comparator and a selector via respective switchable invertors. The comparator produces a selection signal which is supplied to the selector via a switchable invertor. The selector switches an input signal to produce an output signal which is supplied to an output port via a switchable converter.

REFERENCES:
patent: 4621280 (1986-11-01), Shinohara et al.
patent: 4684990 (1987-08-01), Oxley
patent: 4718089 (1988-01-01), Hayashi et al.
patent: 4908700 (1990-03-01), Ishii et al.

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