Colour Measurement Method and Colour Measurement Device

摘要

A colour measurement device includes a measurement array (MA) which includes: a plurality of illumination arrays (20, 30, 40) for exposing a measurement spot (MS) on a measurement object (MO) to illumination light in an actual illumination direction (2, 3, 4) in each case, and a pick-up array (50) for detecting the measurement light reflected by the measurement spot (MS) in an actual observation direction (5) and for converting it into preferably spectral reflection factors; and a controller for the illumination arrays and the pick-up array and for processing the electrical signals produced by the pick-up array. The controller is embodied to process the measured reflection factors on the basis of a correction model, such that distortions in the measurement values as compared to nominal illumination and/or observation directions, caused by angular errors in the illumination arrays and/or the pick-up array, are corrected.

主权项

1. A colour measurement method, in which a measurement spot (MS) on a measurement object (MO) is exposed to illumination light, by means of a colour measurement device, in at least one actual illumination direction of the colour measurement device, and optionally spectral reflection factors (Ri(λ)) of the measurement light reflected by the measurement spot (MS) are measured in at least one actual observation direction of the colour measurement device,
wherein the measured reflection factors (Ri(λ)) are corrected with respect to distortions in the measurement values caused by deviations between the actual illumination and observation directions of the colour measurement device and nominal illumination and observation directions predetermined by the measurement geometry of the colour measurement device, wherein a continuous correction model (C(φ)) is formed from the measured reflection factors (Ri(λ)) and the actual illumination and observation directions of the colour measurement device, wherein said model represents the connection between the measured intensity of the measurement light reflected by the measurement spot and changes in the difference in the illumination and observation directions, and wherein the measured reflection factors (Ri(λ)) are corrected on the basis of this correction model (C(φ)) by incorporating the actual and nominal illumination and observation directions of the colour measurement device.