Imaging systems for maintaining constant the intensity of an out

Details Imaging systems for maintaining constant the intensity of an out Imaging systems for maintaining constant the intensity of an out

1987-07-24

1989-10-10

Heyman, John S.

350342, G02F 113

Patent

active

048727423

ABSTRACT:
An imaging system for maintaining the intensity of an output image constant, where the output image corresponds to a viewed scene. A focusing device forms an input image of the viewed scene on a variable grating modulation device. The viewed scene is then read from the focusing device and a scene intensity distribution pattern formed of two histograms is formed. One of these histograms is processed to produce an output image which has a constant range of intensity levels as adjusted using one of the intensity level of the one histogram.

REFERENCES:
patent: 3980403 (1976-09-01), Pollack
patent: 4227201 (1980-10-01), Grinberg et al.
patent: 4351589 (1982-09-01), Chavel et al.
patent: 4481531 (1984-11-01), Warde
patent: 4707077 (1987-11-01), Marom

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