Chroma keying selector system

摘要

A remotely controlled chroma keyer is provided which is responsive to the red, green and blue signals from a video source such as a color camera for providing color difference signals. A signal processing system using quadrant multipliers is used for summing and differencing these color difference signals which when applied to a non-additive mixer select a particular color. The color selection is determined by control voltages applied to the multipliers.