Full-field phase error detection and compensation method for digital phase-shifting fringe projection profilometry

Digital fringe projection profilometry is one of the most widely utilized non-contact three-dimensional (3D) profile measurement techniques. The phase error caused by nonlinear gamma of digital projectors and cameras eventually reduces the 3D measurement accuracy. This kind of phase error still cannot be detected directly at present. A novel method is present in this paper not only to measure the phase error straightforwardly but also to extract the full-field error distributions. With the aid of the detected phase error distributions, the full-field look-up tables (LUTs) can be obtained to correct the phase measurement result. A set of experiments to validate our methods has been performed. Experimental results well prove that the full-field phase error distributions have been detected successfully, and after utilizing our phase correction method the phase accuracy is obviously improved.