Gray-code fringe order jump error self-correction based on shifted phase encoding for phase measuring profilometry

TL;DR: A real-time 3D measurement method for color objects uses HSI multi-level Gray code demodulation and temporal phase unwrapping to correct fringe order confusion and reduce errors, improving anti-color interference and reconstructing object surface texture.

TL;DR: SPUA-MBLS is a spatial phase unwrapping algorithm based on multi-anchors bidirectional location and suppression that achieves high accuracy and robustness against noise while inheriting the high-speed phase unwrapping feature.

TL;DR: An overview of state-of-the-art phase shifting algorithms for implementing 3D surface profilometry is presented to provide a useful guide to the selection of the most appropriate phase shifting technique for a particular application.

TL;DR: The results show that the multi-frequency temporal phase unwrapping provides the best unwrapped reliability, while the multi -wavelength approach is the most susceptible to noise-induced unwrappers errors.

TL;DR: The fundamental principles behind the primary state-of-the-art 3D shape measurement techniques based on structured light methods will be elucidated, experimental results will be presented to demonstrate capabilities and/or limitations for those popular techniques, and perspectives on those remaining challenges to be conquered to make advanced 3Dshape measurement techniques ubiquitous are presented.

TL;DR: Fourier transform profilometry is one of the popular non-contact 3D measurement methods, where a Ronchi grating or sinusoidal grating is projected onto a diffuse three-dimensional surface, and the resulting deformed grating image is detected by a CCD camera and processed by a computer as discussed by the authors.