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In order to completely eliminate, or greatly reduce the number of phase wrapsin 2D wrapped phase map, Gdeisat et al. proposed an algorithm, which usesshifting the spectrum towards the origin. But the spectrum can be shifted onlyby an integer number, meaning that the phase wraps reduction is often notoptimal. In addition, Gdeisat's method will take much time to make the Fouriertransform, inverse Fourier transform, select and shift the spectral components.In view of the above problems, we proposed an improved method for phase wrapselimination or reduction. First, the wrapped phase map is padded with zeros,the carrier frequency of the projected fringe is determined by high resolution,which can be used as the moving distance of the spectrum. And then realizefrequency shift in spatial domain. So it not only can enable the spectrum to beshifted by a rational number when the carrier frequency is not an integernumber, but also reduce the execution time. Finally, the experimental resultsdemonstrated that the proposed method is feasible.

Improved method for phase wraps reduction in profilometry