Wide dynamic range video camera

Details Wide dynamic range video camera Wide dynamic range video camera

1983-09-08

1985-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350354, 358168, G02F 101

Patent

active

045462488

ABSTRACT:
The invention is a television camera apparatus (10) wherein bright objects are attenuated to fit within the dynamic range of the system, while dim objects are not. The apparatus receives linearly polarized light from an object scene (12), the light being passed by a beam splitter (20) and focused on the output plane of a liquid crystal light valve (16). Light valve (16) is oriented such that, with no excitation from cathode ray tube (22), all light is rotated 90.degree. and focused on the input plane of video sensor (28). The light is then converted to an electrical signal, which is amplified by amplifier (30) and used to excite CRT (22). The resulting image is collected and focused by lens (24) onto light valve (16), which rotates the polarization vector of the light to an extent preportional to the light intensity from CRT (22). The overall effect is to selectively attenuate the image pattern focused on sensor (28).

REFERENCES:
patent: 4124278 (1978-11-01), Grinberg et al.

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