Method and system of measuring image area

Details Method and system of measuring image area Method and system of measuring image area

1984-01-30

1986-01-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 718

Patent

active

045648603

ABSTRACT:
In a method and system of measuring an image area, a solid portion corresponding to a portion having a 100% dot ratio in offset printing is formed in a margin of a printing plate, and a blank portion corresponding to a portion having a 0% dot ratio in offset printing is also formed in the margin of the printing plate. Electrical signals obtained from the solid and blank portions are used as reference values for 100% and 0% dot ratios, respectively. Electrical signals obtained from an image bearing portion of the printing plate are converted to image area percentage data in accordance with these reference values irrespective of a nonuniform surface density of the printing plate.

REFERENCES:
patent: 3958509 (1976-05-01), Murray et al.

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