Optical full-field fringe-projection-based 3D measurement techniques have been widely studied in academia and applied to industrial fields such as automated inspection, reverse engineering, cosmetic surgery and so on owing to the advantages of non-contact operation, fast acquisition, high precision and automatic data processing [1-6]. One or a series of fringe patterns are projected onto the surface of measured objects. From a different viewpoint, the fringe patterns are deformed with respect to the measured shape and an imaging device captures and saves the deformed fringe patterns for post processing. The phase information modulated in the deformed fringe patterns corresponds to the depth (shape) of the measured object and can be calculated mostly by the Fourier transform [7], Wavelet transform [8] or phase stepping algorithms [9] and then unwrapped to obtain absolute phase data. The obtained phase needs to be converted into depth data by a procedure called as calibration, which builds up the relation between phase and depth [10].
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