Measurement position synchronization method for a scanning densitometer.

摘要

There is disclosed a measurement position synchronization method applied to a scanning desitometer to scan photoelectrically a control strip comprising a plurality of colour patches of respective colours printed on a paper thereby to calculate the densities of the colour patches of basic colours. This method comprises: the steps of responding to measured values obtained by scanning a colour patch of a specified colour 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 two points calculated to be an actually measured central point of the colour patch of the specified colour; and carrying out a synchronization of measurement positions in accordance with a difference between a scheduled central point and the actually measured central point. This method is also applicable to a scanning densitometer to scan photoelectrically a control patch comprising a plurality of colour patches of basic colours printed on a paper and formed in ranges divided in a transverse direction thereby to calculate the densities of the colour patches of said ranges and of basic colours.