Hilbert transform-based crosstalk compensation for color fringe projection profilometry

This Letter presents an effective crosstalk compensation method for color fringe projection profilometry. The crosstalk-induced phase error has been studied, and we find that the phase error doubles the frequency of the color fringe. Therefore, Hilbert transform is applied on the color fringe to shift the carried phase by π / 2 . Two phase maps are recovered from the normalized and the transformed patterns, and their average phase is used for three-dimensional (3D) reconstruction. Simulations and experiments confirm that the proposed method can effectively suppress the crosstalk-induced phase error to improve the measurement accuracy.