ISSN : 1796-203X
Volume : 2    Issue : 2    Date : April 2007

Optical 3D Surface Reconstruction by a Multi-Period Phase Shift Method
Erik Lilienblum and Bernd Michaelis
Page(s): 73-83
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One problem of classical phase shifting for optical 3D surface reconstruction is the occurrence of
ambiguities due to the use of fringe projection. We generally derive a number-theoretical approach
to calculate absolute phase measurements which 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 whereby we homogeneously use all pictures which were taken for
the measurement. This leads to a higher average accuracy in the surface reconstruction.
Furthermore we propose a technique to avoid typical calculation errors that are produced in
classical phase shifting caused by discontinuities, occlusions and reflections on the surface.

Index Terms
surface reconstruction, phase shifting, 3D shape measurement, structured light, fringe projection