Dynamic video system including automatic contrast and...

Details Dynamic video system including automatic contrast and... Dynamic video system including automatic contrast and...

H - Electricity

04

N

350/83

H04N 5/57 (2006.01) H04N 5/20 (2006.01)

Patent

CA 2021094

A television system is disclosed including sections for limiting peak white drive to a display device (e. g., of the direct view or projection type) while maintaining relatively high subjective image contrast and brightness. Specifically, the system includes an automatic contrast control section for controlling the amplitude of the luminance signal in response to the peak value of a luminance-representative image component signal preceded by a "white-stretch" control section for emphasizing mid-range luminance components relative to high-range luminance components as a function of the average value of the luminance-representative image component. In this way, spot blooming and display driver saturation can be minimized while providing subjectively sharp, bright pictures.

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