In Phase Measurement Profilometry(PMP), the setting of the reference plane plays an important role. It is a critical step
to capture the grating fringe projected onto the reference plane in PMP. However, it is sometimes difficult to choose and
place the reference plane in practical applications. In this paper, a virtual reference plane is introduced into PMP, with
which 3D measurement can be realized without using the physical reference plane. The virtual reference plane is
generated through extracting a partial area of the deformed fringe image that corresponds to a planar region and
employing the interpolation algorithm. The method is proved theoretically through simulation experiments, providing a
new suggestion for actual measurement by PMP.
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