Method and apparatus for determining the average picture level of a video signal.

摘要

A method and apparatus for producing a signal representing the average picture level of a video signal during a preselected time interval, typically a field of a television video signal, utilizes a comparator (10) and counter (12) to integrate the difference between the level of an incoming video signal (at A) and a reference signal (at B) during the preselected time. The output (20) of the counter (12) represents the average picture level for the field and is used for subsequent correction of the video signal. <IMAGE>