Mark detection apparatus for a micro-roll film

Details Mark detection apparatus for a micro-roll film Mark detection apparatus for a micro-roll film

1985-10-23

1987-08-18

Hix, L. T.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

250570, 355 77, 353 26A, G06K 710

Patent

active

046873210

ABSTRACT:
Disclosed is a mark detection apparatus for a microfilm having marks which are recorded adjacent to respective frames and are classified into a few groups with different sizes. The apparatus detects widths of the marks, determines a threshold level from detected widths of the marks and controls counting of the marks by size through the use of the threshold level.

REFERENCES:
patent: 3904099 (1975-09-01), Inoue
patent: 4176944 (1979-12-01), Payrhammer
patent: 4514641 (1985-04-01), Tanaka et al.
patent: 4600841 (1986-07-01), Tokuno et al.
patent: 4607950 (1986-08-01), Ishii et al.

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