Measurement position synchronization method for a scanning densi

Details Measurement position synchronization method for a scanning densi Measurement position synchronization method for a scanning densi

1987-12-04

1989-10-17

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

250226, G01J 350

Patent

active

048742473

ABSTRACT:
There is disclosed a measurement position synchronization method applied to a scanning densitometer to photoelectrically scan a control strip comprising a plurality of color patches of respective colors printed on a paper to thereby calculate densities of the color patches every respective colors. This method comprises: the steps of responding to a measured values obtained by scanning a color patch of a specified color to calculate points which have varied respectively by predetermined values on the side of a reference level included in the measured values; determining the intermediate point of the both points calculated to be an actual measurement central point of the color patch of the specified color; and carrying out synchronization of measurement positions in accordance with a difference between a scheduled central point and the actual measurement central point. This method is applicable also to a scanning densitometer to photoelectrically scan a control patch comprising a plurality of color patches of respective colors printed on a paper and formed every ranges divided in a transverse direction to thereby calculate densities of the color patches every said ranges and every respective colors.

REFERENCES:
patent: 4003660 (1977-01-01), Christie, Jr. et al.
patent: 4494875 (1985-01-01), Schramm et al.
patent: 4505589 (1985-03-01), Ott et al.

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