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

摘要

A device and a method for determining three dimensional surface coordinates of an object by means of optical color triangulation are proposed, wherein all lines of a color fringe pattern in each case have a width (BR) set in such a way that, in a recorded image of the line, all contrast maxima (CMax), of all spectral components of a line are equal to a minimum contrast value (CMin) is provided. Proceeding from an invariable smallest width of a pattern line with a spectral component of highest contrast, further lines can be correspondingly widened. The invention is particularly advantageously suitable for a 3D measurement for biological tissue.

主权项

1. An apparatus for determining three-dimensional surface coordinates of an object by means of optical color triangulation, comprising:
a projector device for illuminating the object with a set color fringe pattern, 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; an acquisition device arranged in a known relative position with respect to the projector device and serving for recording an image of the object onto which the color fringe pattern was projected once; a computer device for calculating the three-dimensional surface coordinates by means of identifying the selection of the spectral components of a respective line and acquiring a respective transition of two lines adjoining one another, wherein for all lines, by means of the projector device, the width of a respective projected line is set wherein, 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).