Method for detecting image information

Details Method for detecting image information Method for detecting image information

1986-02-20

1987-03-17

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

250202, 354402, 355 68, 358227, G03B 2752

Patent

active

046503161

ABSTRACT:
It is necessary to photographically measure the density of an original film or to measure the size of a film manually or automatically for input in photographic printing system in order to determine printing exposure amount or correction amount therefor. Image sensors are usually used as a means in such measurement, but image information should be detected always under the same conditions irrespective of the size of negative film frames. This invention method allows effective detection of the whole frame of an original film with substantially the whole area of an image sensor as the method can make the sizes of light receiving areas on the image sensor constantly substantially identical to each other.

REFERENCES:
patent: 3469105 (1969-09-01), Stasey
patent: 3708676 (1973-01-01), Huboi et al.
patent: 3829214 (1974-08-01), Zahn et al.
patent: 3873201 (1975-03-01), Amano
patent: 4218133 (1980-08-01), Biedermann
patent: 4268165 (1981-05-01), Bradmon
patent: 4375916 (1983-03-01), Levine
patent: 4383274 (1983-05-01), Inuiya
patent: 4532602 (1985-07-01), Du Vall

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