System and apparatus for conversion of video signals to film images

摘要: Gamma correction in an imaging system which provides photographic reproductions of images represented by video signals is achieved controlling the duration exposure a constant intensity scanning beam. A moving threshold signal swept at varying rate corresponding to gamma curve between opposite limits over given total interval, as image repeatedly presented. The instantaneous amplitude compared and results comparison used control whether beam on or off for picture area. curves are advantageously presented numerical sequences defining interlinked incremental segments different slope.