Negative/positive microfilm discriminating system

Details Negative/positive microfilm discriminating system Negative/positive microfilm discriminating system

1988-02-12

1989-05-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 30, 355204, G03B 2774, G03B 2780

Patent

active

048355771

ABSTRACT:
A negative-positive microfilm discriminating system for use in a microfilm reader/printer apparatus, comprising a sensor for detecting the densities at a plurality of spots within an image zone of a microfilm strip, and a control circuit for discarding a fraction of the density data when the fraction of the data is representative of a density occurring at less than a predetermined percentage of the total number of spots and discriminating whether the microfilm strip is a negative or a positive on the basis of the remaining fraction of the density data.

REFERENCES:
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4341463 (1982-07-01), Kashiwagi et al.
patent: 4610537 (1986-09-01), Matsumoto
patent: 4650316 (1987-03-01), Matsumoto
patent: 4660965 (1987-04-01), Matsumoto
patent: 4724461 (1988-02-01), Rushing
patent: 4737819 (1988-04-01), Taniguchi

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