Phase-shift profilometry calibration through filtering in Fourier domain and background subtraction with bicubic interpolation

Abstract

A novel approach of calibrating the phase-shift profilometry technique for an artifact-free 3D reconstruction is presented in this paper. Nonuniform illumination which causes a wrong depth perception of the object was resolved through background subtraction with bicubic interpolation. Artifacts caused by the sinusoidal fringes projected to the object surface are carried out in the unwrapped phase maps. Filtering in Fourier space was applied to remove the unwanted fringe artifacts. The artifacts were removed successfully in the 3D reconstructions of a pebbled wall and step pyramid.