Apparatus for adaptively controlling a video signal recursive filter

摘要

A video signal recursive filter includes circuitry for controlling the integration time of the filter. The control circuitry develop a motion- threshold value responsive to the noise content of signal differences developed by subtracting a processed signal, delayed by a frame period, from an incoming video signal. The signal differences are compared against the motion threshold to develop motion signals indicating the history of image motion for each picture element. Circuitry responsive to the signal noise content develops a signal which is coupled to the motion signals to form address codewords that are applied to a ROM programmed with predetermined control signals for establishing the integration time of the recursive filter.