Optical EngineeringMultiresolution three-dimensional measurement system with multiple cameras and light sectioning method
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A multiresolution 3-D measurement system using multiple cameras and a light sectioning method is developed to measure complex-profile objects for which other optical measuring methods are less suited. The system is composed of four cameras, which can select different system parameters to measure the whole profile and some details of an object at the same time. Thus, the system has a multiresolution measuring feature. We mainly focus on the imaging system model, system calibration, and the data merging method, and furthermore propose a calibration method with a self-designed planar calibration target and a data merging algorithm based on empirical mode decomposition. Experimental results show that position uncertainty of a measured point within the section plane is less than 0.06 mm in a 80×80-mm2 measurement range. The system is employed to measure a blade and a gear with relatively satisfactory results.