Method and system of processing image signals

Details Method and system of processing image signals Method and system of processing image signals

1982-12-08

1986-02-25

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

101365, 358 80, 358107, G06K 950

Patent

active

045731900

ABSTRACT:
In an image area measuring apparatus wherein an image bearing surface of a lithographic printing plate is divided into a plurality of zones and photographed with a television camera to produce analog image signals which are converted into digital signals to obtain a measured value, the image area of each zone is calculated based on the measured value and a quantity of printing ink is determined according to the image area, there is provided a method of processing an image signal including the steps of preparing a first conversion table for 100% dot ratio, and a second conversion table for other percentage of dot ratios, determining the quantity of printing ink from the first conversion table at the time of printing an image having 100% dot ratio, and determining the quantity of the ink from the second conversion table at the time of printing an image having a dot ratio other than 100%.

REFERENCES:
patent: 3958509 (1976-05-01), Murray et al.
patent: 4149187 (1979-04-01), Palmer et al.

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