Image analysis – Histogram processing – For setting a threshold
Patent
1990-06-08
1992-08-11
Razavi, Michael
Image analysis
Histogram processing
For setting a threshold
382 61, 101181, 250548, 250557, G06K 900
Patent
active
051386674
ABSTRACT:
A process consists of detecting a printed registration mark composed of recognition signals and of a color pilot mark, comparing the image of the signs of the printed registration mark to the signs of a virtual reference registration mark, then defining a basic area for each sign, calculating a geometric center of every basic area, detecting any color pilot mark in these basic areas, calculating and memorizing the geometric center for the detected pilot mark, measuring an offset position between the geometric center of the basic area and the geometric center of the detected color pilot mark and utiliziing the measured offset position for controlling a misregistration correction appliance of a printing press. The device for accomplishing the process includes an arrangement for performing each of the above-mentioned steps.
REFERENCES:
patent: 4484079 (1984-11-01), Betz et al.
patent: 4528630 (1985-07-01), Sargent
patent: 4600841 (1986-07-01), Tokuno et al.
patent: 4719575 (1988-01-01), Gnuechtel
patent: 4901359 (1990-01-01), Bruder
patent: 4926048 (1990-01-01), Lerner et al.
patent: 4932320 (1990-06-01), Brunetti et al.
Kammenos Panayotis
Roch Roger H.
Vitous Vaclav
Bobst SA
Razavi Michael
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