Apparatus and method for processing video signals with key signa

Details Apparatus and method for processing video signals with key signa Apparatus and method for processing video signals with key signa

1989-09-01

1990-11-13

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 5265

Patent

active

049705954

ABSTRACT:
The gain of an input video signal of different possible gains relative to a selected reference gain is adjusted according to an associated key signal indicative of gain change previously undergone by the input video signal and an independent key signal indicative of the desired change in gain to produce an output video signal having a selected gain determined by the values of the associated and independent key signals. The output video signal is combined with other video signals, whose gain may or may not have been adjusted relative to the reference gain.

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