Multi-frequency inverse-phase fringe projection profilometry for nonlinear phase error compensation |
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Affiliation: | 1. School of Physics and Optoelectronic Engineering, Xidian University, Xi''an 710071, China |
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Abstract: | A new multi-frequency inverse-phase method was proposed to compensate for nonlinear phase errors in fringe projection profilometry and to measure the three-dimensional shape of discontinuous objects. After introducing a phase offset of π/4 into the multi-frequency four-step phase-shifting method the corresponding nonlinear phase error reversed its sign, which allowed the addition of unwrapped phases before and after the phase-offset operation to compensate for the error. For the four-step phase-shifting method, simulation analysis showed that the nonlinear phase error had quadrupled the fringe frequency. Moreover, experimental results verified the feasibility and applicability of the proposed method. |
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Keywords: | Nonlinear phase error compensation Inverse-phase method Multi-frequency phase unwrapping Fringe projection profilometry |
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