Exposure controlling apparatus

Details Exposure controlling apparatus Exposure controlling apparatus

1990-10-05

1992-11-10

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 77, G03B 2780

Patent

active

051628414

ABSTRACT:
An exposure controlling apparatus includes a sensor for effecting photometry by separating light from an original picture into a plurality of separated components; a storage device for storing a value concerning the spectral sensitivity of the sensor and a value concerning the spectral sensitivity of a copying sensitive material to be copied; an estimating device for estimating a spectral characteristic of the original picture on the basis of a photometric value of the sensor and the value concerning the spectral sensitivity of the sensor stored in the storage device; and a controller for determining a synthetic value which is equivalent to a value measured by a sensor having a spectral sensitivity distribution identical with or similar to a spectral sensitivity distribution of the copying sensitive material on the basis of the spectral characteristics of the original picture estimated and the value concerning the spectral sensitivity of the copying sensitive material, and for controlling exposure amount on the basis of the synthetic value. Accordingly, it is possible to control exposure amount by estimating the spectral characteristics of the original picture even from photometric values obtained by effecting photometry by separating the light into components having a wide half-width.

REFERENCES:
patent: 4093375 (1978-06-01), Griesch et al.
patent: 4707118 (1987-11-01), Terashita
patent: 4942424 (1990-07-01), Terashita et al.
patent: 5036351 (1991-07-01), Frick et al.

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