Method and apparatus for registration mark identification

Details Method and apparatus for registration mark identification Method and apparatus for registration mark identification

1988-05-11

1991-05-21

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

250559, 250571, 356429, 364469, G06K 900

Patent

active

050182137

ABSTRACT:
Apparatus and method particularly suitable for use with the close loop color to color registration system of a commercial web printing apparatus utilizes a CCD camera for identifying registration marks. The registration mark composed of a pattern of dot pairs is acquired by the camera and each dot pair of the mark is identified by scoring various attributes of possible dot pairs including color, size and position. This results in highly stable and reliable acquisition of a registration mark on a printed web which may then be processed by an automated registration control system.

REFERENCES:
patent: 4318176 (1982-03-01), Stratton et al.
patent: 4366542 (1982-12-01), Anselrode
patent: 4528630 (1985-07-01), Sargent
patent: 4561103 (1985-12-01), Hariguchi et al.
patent: 4794453 (1988-12-01), Gnuechtel et al.
patent: 4836446 (1989-06-01), Reynolds et al.

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