3D Shape Reconstruction Algorithm Of Specular Surface Based On Phase Deflection

By virtue of its superior optical performances, specular surfaces have been widely used in manufacturing, medicine science, computer science, defense and other fields. The wide applications have put forward higher requirements for the specular surfaces accuracy, studying a3D reconstruction algorithm that recovers the profile of specular surfaces have important significance in increasing the quality of the surface processing and product performance. It is hard to complete the reconstruction of the specular surfaces that are large or have high curvature by just one of the existing3D reconstruction algorithms with high precision and rapid speed. In this paper, considering the3D shape measurement methods of specular surfaces that based on grating phase deflection, based on iterative strategy, we proposed a novel3D reconstruction method which integrates two existing3D reconstruction algorithms together, this method is the combination of the path integration technique and zonal wave-front reconstruction algorithm.The main work is as follows:1. Calibration of the position of the stage and the LCD were finished. The plane equations of the stage and the projection image plane were calculated. The selection of the parameters of the grating display equipment and image acquisition device were analyzed.2. A3D reconstruction model of specular surfaces which is based on the iterative method was established.3. The reference phase were calculated by using a special marked point method, which avoided the measurement requirements for the ideal reference surface, and the measurement efficiency and reconstruction accuracy were improved.4. A new3D reconstruction method was proposed, that is an improved method which is an combination of the path integration method and zonal wave-front reconstruction algorithm. Before reconstruction, the boundary of the measured object was detected, reducing the amount of data to be processed and identifying the smooth reconstructed surface.5. The3D morphology of gauge blocks, a specular planar mirror and a specular hyperboloid surface were reconstructed.