Method and device for measuring a halftone dot area rate or a ha

Details Method and device for measuring a halftone dot area rate or a ha Method and device for measuring a halftone dot area rate or a ha

1981-04-30

1984-08-14

Arnold, Bruce Y.

Optics: measuring and testing

For light transmission or absorption

By comparison

356445, G01N 2101, G01N 2155

Patent

active

044653751

ABSTRACT:
A method for measuring a halftone dot area rate or a halftone picture density in a densitometer or half-tone dot area rate measuring means. A light beam is emitted by a light source and impinges upon an object to be measured. The light beam passes through or is reflected from the object to be measured and is received by a photoelectric element. A weighting of the light beam is performed by a weighting means so that the assigned weigth is substantially large at its central part and is reduced radially to its periphery, the reduction depending upon a transmittance or a reflectance of the object.

REFERENCES:
patent: 3053181 (1962-09-01), Jorgensen
patent: 3375751 (1968-04-01), Engborg et al.
patent: 3393602 (1968-07-01), Stouffer
patent: 4264210 (1981-04-01), Mitsuhashi
patent: 4371265 (1983-02-01), Mitsuhashi

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