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Abstract

The concept includes projecting at the object surface, along a first optical axis, two or more two-dimensional (2D) images containing together one or more distinct wavelength bands. The wavelength bands vary in intensity along a first image axis, forming a pattern, within at least one of the projected images. Each projected image generates a reflected image along a second optical axis. The 3D surface data is obtained by comparing the object data with calibration data, which calibration data was obtained by projecting the same images at a calibration reference surface, for instance a planar surface, for a plurality of known positions along the z-axis. Provided that the z-axis is not orthogonal to the second optical axis, the z-axis coordinate at each location on the object surface can be found if the light intensity combinations of all predefined light intensity patterns are linearly independent along the corresponding z-axis.

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First Claim