Accession Number : ADD003401

Title :   Adaptive Gray Scale Control Circuit for Television Video Signals.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Sirrine,Edwin B

Report Date : 28 Dec 1976

Pagination or Media Count : 3

Abstract : The patent relates to Television picture 'wash-out' eliminated by means of a signal processing circuit that adapts and enhances the video gray scale of television pictures to compensate for adverse lighting conditions in the viewed area. The circuit approach comprehends processing the video signal in terms of picture area. Each step on the gray scale from black to white is assigned a percentage of the total picture. The circuit comprises a plurality of comparators each working at a different threshold level. Each comparator is followed by an integrator and a feedback circuit that adapts that comparator sense level to the incoming signal. The video signal is processed in a way that always produces certain assigned ratios of black, white, and/or shades of gray.

Descriptors :   *Signal processing, *Patents, Television systems, Television equipment, Video signals, Gray scale, Control, Images, Adaptive systems, Circuits

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE