Valid patch discrimination method for automatic density control

Details Valid patch discrimination method for automatic density control Valid patch discrimination method for automatic density control

1988-11-23

1990-11-20

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

250226, G01J 351

Patent

active

049714465

ABSTRACT:
In a valid patch discrimination method for an automatic density control apparatus, a density of a color bar printed on a paper is measured in units of colors, a predetermined calculation is performed based on the measurement result, and the calculation result is compared with a prestored value to discriminate a presence/absence of a valid color patch.

REFERENCES:
patent: 3835777 (1974-09-01), Krygeris
patent: 4289405 (1981-09-01), Tobias
patent: 4505589 (1985-03-01), Ott et al.

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