However, the key to the success of FTP is that the high-frequency fringe information modulated by the object surface can be well separated from the background intensity in the frequency domain.Īs a result, the FTP technique is limited to measuring smooth surfaces with limited height variations. Nevertheless, high-accuracy 3D reconstruction using only one single pattern has been the ultimate goal of structured light 3D imaging in perpetual pursuit. These composite phase shifting methods reduce the number of fringe patterns required per 3D reconstruction from ~10 to five, four, three, or even two, achieving high-speed 3D sensing at 10k frames per second. ![]() ![]() Qian Chen and Chao Zuo's research group at Nanjing University of Science and Technology established the theoretical framework for phase shifting profilometry and temporal phase unwrapping and developed a series of composite phase shifting methods for fast 3D measurement, including bi-frequency phase shifting, 2+2 phase shifting, geometric constraints based composite phase shifting, and micro Fourier transform profilometry (μFTP). ![]() The accuracy and efficiency of phase retrieval from fringe patterns are essential to dynamically reconstruct various desired physical properties of the objects (the profile, distance, strain, etc.).įor structured light 3D imaging based on FPP, to minimize the number of fringes required for a single reconstruction, Prof. With the invention of the laser and charge-coupled device (CCD), many optical metrology methods and instruments are employed in state-of-the-art manufacturing processes, precision positioning, and quality assessment because of their advantages in terms of accuracy, sensitivity, repeatability, and speed.įor many optical metrology techniques such as interferometry, digital holography, and fringe projection profilometry (FPP), fringe pattern analysis is the primary focus of research for recovering the underlying phase distribution from the recorded fringe patterns.
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