Unambiguous 3D Measurements by a Multi-period Phase Shift Method
One problem of classical phase shift technique for 3D surface measurement is the occurrence of ambiguities due to the use of fringe projection. We propose a universal theory to calculate unambiguous values called projector coordinates. The projector coordinates can be used as a base for a reliable surface reconstruction without any ambiguity. The essence of our method is the application of pattern sequences with different periods. In contrast to combined techniques like hierarchical phase shift or phase shift with Gray code we use all pictures homogeneously which were taken for the measurement. This leads to a higher accuracy. Furthermore we are able to avoid some typical calculation errors that are produced in classical phase shifting.
KeywordsPattern Sequence Lookup Table Fringe Pattern Projector Coordinate Gray Code
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