Apparatus for reading a film image with controllable illuminatio

Details Apparatus for reading a film image with controllable illuminatio Apparatus for reading a film image with controllable illuminatio

1988-10-18

1989-06-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356444, G01N 2186

Patent

active

048374504

ABSTRACT:
An apparatus for reading a microfilmed image to obtain digital image signal, in which the level of quantizing is determined by measuring the density of image and of background.

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