Novel calibration technique for hybrid structured-light three-dimensional measurement system

Hybrid structured-light measurement technique is used for form measurement of structured composite surfaces. A hybrid structured-light measurement system contains a phase measuring deflectometry (PMD) subsystem and a fringe projection profilometry (FPP) subsystem. Each subsystem measures specular surfaces and rough surfaces based on structured-light reflection and projection principle, respectively. Calibration’s accuracy extremely effects data stitching precision between the subsystems. A novel calibration technique is explored for the hybrid structured-light system to complete reliable measurement accuracy. Calibration algorithms are developed based on designed calibration targets. Information of the calibration procedure are discussed and presented. Effectiveness of the proposed calibration technique has been conducted and verified through experiments by measuring structured composite samples. Experimental results demonstrate that the proposed technique can significantly improve data fusion accuracy of a hybrid structured-light measurement system.