A three-dimensional measurement system based on moiré interferometry for visual inspection of hemi-sphere objects

This paper focus on the measurement of hemi-sphere objects with specularity and shadow. For accurate measurement of these objects, a specially designed visual sensor system is proposed, which is based on phase shifting moire interferometry. To remove specular noise and shadow area efficiently, a compact multiple-pattern projection is implemented in the sensor system. To see how this system works, a series of experiments is performed and the results are analyzed in detail.