Photographic image information detecting device

Details Photographic image information detecting device Photographic image information detecting device

1985-01-14

1986-09-09

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

250214C, 250214P, 356225, 356233, 358213, G03B 2772

Patent

active

046105379

ABSTRACT:
An image information detecting device for detecting the density for printing is required to cover a wide dynamic range corresponding to the density scope of the original film as well as to cover the fluctuation in values caused by different lamps and filters used in the photometric system. It is also important in photographic printing process to detect the density information on a relatively wide area of a frame of a negative film or the like in order to determine exposure or correction amount. The present invention enables the use of a storage-type light receiving element over a wide dynamic range as well as segmentation of picture images of a film of a wide scope into a large number of picture elements for detection.

REFERENCES:
patent: 3533705 (1970-10-01), Fukushima
patent: 3813158 (1982-02-01), Zahn
patent: 4251157 (1981-02-01), Knor et al.
patent: 4379632 (1983-04-01), Dedden et al.

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