Color coding for 3d measurement, more particularly for transparent scattering surfaces

A method for determining three-dimensional surface coordinates of an object by means of optical color triangulation, comprising the following steps:

• illuminating the object with a set color fringe pattern, said illuminating being performed by means of a projector device, wherein the color fringe pattern extends along an axis and consists of lines which are perpendicular thereto and which have a different selection of spectral components of the projected light in each case with respect to adjacent lines;
• recording an image of the object onto which the color fringe pattern was projected once, said recording being performed by means of an acquisition device arranged in a known relative position with respect to the projector device;
• calculating—performed by means of a computer device—the three-dimensional surface coordinates by means of identifying the selected spectral components of a respective line and acquiring a respective transition of two lines adjoining one another, characterized by setting for all lines, by means of the projector device, the width of a respective projected line in such a way that, in the recorded image of the line, all contrast maxima (Cmax) of all spectral components of said line are equal to a minimum contrast value (Cmin).