Negative/positive microfilm discriminating system

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

1989-03-28

1989-12-05

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 45, 355 68, G03B 2752

Patent

active

048856053

ABSTRACT:
A negative-positive microfilm discriminating system for use in a microfilm reader/printer apparatus, comprising a reflector mirror for projecting a beam of light bearing an image detected from a microfilm strip, a sensor disposed in the path of light from the reflector mirror for detecting the densities in each of a plurality of blocks of a patterned image zone of the microfilm strip, and a control circuit for selecting out of the blocks the blocks having acceptable degrees of contrast, determining whether the image zone within each of the selected blocks is a negative or is a positive and determining whether the micrifilm strip is a negative or is a positive.

REFERENCES:
patent: 3455632 (1969-07-01), Neale et al.
patent: 3790275 (1974-02-01), Huboi et al.
patent: 4018526 (1977-04-01), Schroter
patent: 4341463 (1982-07-01), Kashiwagi et al.
patent: 4591264 (1986-05-01), Ueda et al.
patent: 4719494 (1988-01-01), Shiota
patent: 4743948 (1988-05-01), Ohtsuka

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