Patent ID: 8441642

Claim:
A color measuring device, comprising: a. a lighting arrangement for a measurement field of a measurement object to be measured, b. a pick-up arrangement for detecting the measurement light reflected back from the measurement field and converting it into corresponding electric signals, c. an electronic circuit for controlling operation of the color measuring device and processing and evaluating the electric signals, and d. a display for displaying measurement results, wherein the lighting arrangement comprises a lamp ring with at least three lamp groups mutually offset at an angle around 360°, each of said lamp groups with at least one light source for illuminating the measurement field from a predefined range of angles of incidence relative to the normal onto the measurement field, wherein the pick-up arrangement has a photoelectric converter arrangement in the form of an imaging sensor which creates an image of the measured measurement field made up of image pixels, and the electronic circuit is designed to switch on the light sources of the lamp groups of the lighting arrangement selectively, wherein the imaging sensor creates a separate image of the measurement field for one or more individually switched-on light sources, respectively, and forwards the measurement values of the individual image pixels associated with different lighting directions to the electronic circuit as image data, and wherein the electronic circuit is designed to run a flat correction in order to compensate for interference effects induced by texture, and a spatial orientation of the normal onto the image pixels of the measurement field relative to a measurement plane is determined from the measurement values of the different lighting directions, and the spatial orientation is applied as a means of correcting the image data of the image pixels so that they are identical to the image data that would have been measured had the normal onto the relevant image pixels been perpendicular to the measurement plane and the image pixels had lain in the measurement plane.