Method of, and apparatus for, modifying luminance levels of a bl

Details Method of, and apparatus for, modifying luminance levels of a bl Method of, and apparatus for, modifying luminance levels of a bl

1983-07-11

1987-12-01

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 82, 358169, 358 27, H04N 943

Patent

active

047108053

ABSTRACT:
A method of modifying luminance levels of a black and white video signal is provided. The signal is fed to a voltage controlled amplifier and to first and second clipper amplifiers. Each clipper amplifier has an adjustable gain and an adjustable clip level, which are set to desired levels. The outputs of the clipper amplifiers are fed to a summation amplifier in which they are summed to produce a control signal. The control signal is fed to the voltage controlled amplifier, to vary its gain, and thus to compress one band of luminance levels whilst expanding another band of luminance levels.

REFERENCES:
patent: 3647942 (1972-03-01), Siegel
patent: 3706841 (1972-12-01), Novak
patent: 3761607 (1973-09-01), Hanseman
patent: 3772465 (1973-11-01), Vlahos
patent: 3972067 (1976-07-01), Peters
patent: 4395732 (1983-07-01), Upton
patent: 4403253 (1983-09-01), Morris
patent: 4574393 (1986-03-01), Blackwell
patent: 4606625 (1986-08-01), Geshwind
patent: 4608596 (1986-08-01), Williams

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