首页|Generic and flexible self-correction method for nonlinearity-induced phase error in three-dimensional imaging
Generic and flexible self-correction method for nonlinearity-induced phase error in three-dimensional imaging
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万方数据
维普
In three-dimensional imaging employing phase-shifting profilometry[PSP],the nonlinear response of projector and camera makes the fringe gray distribution non-sinusoidal,which further leads to phase error.Although the double 3-step phase-shifting method is simple and effective,it needs to add an additional set of fringe sequences,which reduces the measure-ment efficiency.To this end,this paper introduces a generic and flexible self-correction method for nonlinearity-induced phase error.First,according to the nonlinearity-induced phase error model,we introduce an additional wrapped phase with a phase difference of π/3.The error waveform of the two wrapped phases is opposite but not coincident.Then,we introduce an estimation algorithm for the additional wrapped phase offset.Finally,we fuse the two wrapped phases to correct the phase error.Experiments confirm that the root mean squared error of the proposed method is 64.1％lower than that of the traditional method and 13.3％lower than that of the Hilbert transform method.The proposed method does not require any additional fringes or hardware assistance and can be easily extended to 4-step or 5-step PSP.
万方数据
维普
