Research on High-Gloss Surface Detection Method Based on Projection grating Phase and LCD Screen Phase Compensation

Due to the problem of overexposure that existing in traditional phase measurement profilometry method during the reconstruction of high reflective objects, this paper proposes an absolute phase acquisition method based on phase measurement profilometry and LCD screen phase compensation. This method, first, structured light is projected onto high reflective object using a projector and LCD screen, second, the absolute phase information projected by projector and LCD is obtained. After that, the absolute phase information of overexposure area is obtained by the algorithm that proposed in this paper. Finally, the object under measurement is reconstructed using the stereo vision algorithms. The experiment shows that this method is capable of recovering phase information for highly exposed areas, overcoming the problem of outliers and discrete point clouds. It measures 99.99% of the valid point cloud, that shows this method is effective.