Triple <i>N</i>-Step Phase Shift Algorithm for Phase Error Compensation in Fringe Projection Profilometry
Jianhua Wang, Yanxi Yang
Abstract
For fringe projection profilometry (FPP), the nonlinear response of the camera and projector in a 3D measurement system causes the captured fringe to be non-sinusoidal, which results in periodic phase errors. This paper reports a theoretical analysis of the phase error caused by the non-sinusoidal fringe, and proposes a triple N-step phase shift (PS) algorithm. Experimental results demonstrate that the proposed algorithm outperforms the existing double N-step phase shift algorithm in terms of reducing the phase error caused by the non-sinusoidal captured fringe.
Topics & Concepts
ProjectorProfilometerStructured-light 3D scannerPhase (matter)Projection (relational algebra)AlgorithmCompensation (psychology)OpticsComputer scienceObservational errorNonlinear systemPhase retrievalPhysicsMathematicsFourier transformMaterials scienceSurface finishStatisticsQuantum mechanicsComposite materialPsychologyPsychoanalysisOptical measurement and interference techniquesAdvanced Measurement and Metrology TechniquesOptical Systems and Laser Technology