​ Abstract: Fringe projection profilometry (FPP) is a three-dimensional imaging system and is widely used in object digitization, reverse engineering, etc. Therefore, it is important that FPP systems used for both research and commercial purposes are reliable. The random phase error that occurs is what affects the reliability of such a system the most. This error is not only caused by environmental noise, the geometry of the object being tested, etc. It also occurs due to the disadvantages of the methods used in the analysis of the data obtained from the system. For example, almost all methods are dependent on geometric shape, edge effects, value deviations, inability to see a large part of the object, shadow effects, etc., which cause problems. The aim of this study is to find a hybrid method based on Fourier transformation that is least affected by this randomly occurring phase noise, i.e., to identify the analysis method that least affects the reliability of the system. To do this, repeatability values obtained from the standard deviation calculated from the results obtained for each analysis method from the experimental data were used. As a result, it was determined that the 2D-EMD-FFT method, which gives the highest repeatability value, i.e., the lowest average standard deviation, has the least effect on the reliability of the system.

Keywords: L-FPP, 2D-EMD-FFT, TFFT, Hybrid methods, Repeatability, Reliability.

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