| 摘要 |
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. Each projected image includes a first image axis and a second image axis. The wavelength bands vary in intensity along the first image axis, forming a pattern, within at least one of the projected images. When projected on the object surface, each projected image generates a reflected image along a second optical axis. The reflected image is recorded by an image sensing unit. 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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