Conversion of video signals to photographic prints
Номер патента: AU9083982A
Опубликовано: 30-06-1983
Автор(ы): John Kelsay Cool
Принадлежит: IMAGE RESOURCE CORP
Опубликовано: 30-06-1983
Автор(ы): John Kelsay Cool
Принадлежит: IMAGE RESOURCE CORP
Реферат: Gamma (or other linearity) correction in an imaging system which provides photographic reproductions of images represented by video signals is achieved by controlling the duration of exposure of a constant intensity scanning beam. A moving threshold signal is swept at a varying rate corresponding to a gamma correction curve between opposite limits over a given total exposure interval, as the image is repeatedly presented. The instantaneous amplitude of the video signal is compared to threshold signal and the results of the comparison used to control whether the beam is on or off for a given picture area. The gamma correction curves are advantageously presented as numerical sequences defining interlinked incremental segments of different slope.
Contrast processing of video signals with self-adjusting reference
Номер патента: US3842200A. Автор: V Dolch. Владелец: SCANNER. Дата публикации: 1974-10-15.