Phase-shift profilometry calibration through vignetting removal and gamma inversion
Abstract
Phase-shift profilometry uses projected fringes to construct a 3D digital object from 2D images captured with projector-camera pairs. In this paper, a novel way of calibrating projector-camera pairs for artifact-free 3D reconstruction is presented by removing optical and digital nonlinearities such as vignetting effect and inherent gamma of both the projector and camera. Vignetting effect is least pronounced at small aperture sizes so the camera was set at an aperture size of F/22 to remove the vignetting effect. Furthermore, gamma was removed through nonlinear fitting of the input-output curve of the combined projector-camera system. These corrections were applied to the 2D images used for 3D reconstruction via phase-shift profilometry. Experimental results show an increased level in intensity contrast for the fully-processed images as compared with the unprocessed based on their phase maps and projected intensity profiles, with a percentage difference of 33%.
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