In the 3D phase measurement with large view field, when the number of fringes is not too many, the period broadening problem of projection fringes will seriously affect the accuracy of measurement. In this paper, an accurate and convenient 3D shape measurement method based on phase shifting fringe projection is prop osed. Firstly, in the fringe projection measurement system based on the triangulation principle, the fringe position coordinates are taken as the input and output parameters of the system, and the linear mathematical model of fringe period correction is de rived. Secondly, the model parameters are obtained by simple calibration process. Through using the idea of reverse fringe projection, the new fringe to be projected is calculated from the correction model, and then periodic four-step phase shifting projection fringes can be produced. Finally, a four-step phase shifting method is used to restore the 3D shape of object. The experiments of fringe period correction and 3D profile measurement show that the proposed method can easily generate the phase-shifting projection fringes with equal period distribution and hence improve the measurement accuracy of phase-shifting method.
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