Development Of An Optical 3D Profilometry System Based On A Digital Projector

As a non-contact, rapid, reliable technique, optical 3D profilometry has been extensively used in the field of machine vision, auto-manufacture, industrial online testing, object simulation and biomedicine. An optical 3D measurement system that is based on the digital phase-shifting and fringe projection technique and image processing method was designed in this thesis, and the relevant software was developed.The dissertation mainly includes followings:1. Parameters and system hardware configuration was selected after analyzing the typical phase measurement profilometry (PMP) system. Phase-shifting method, phase unwrapping algorithm and system calibration method were discussed in detail.2. The software that is based on Visual C++ and Matlab mixed programming was developed, and the software has following functions such as grating projecting, image capturing, data processing and 3D data displaying.3. Several methods were used to improve the system calibration and measurement accuracy. A novel interpolation algorithm for calibration was proposed, system gamma and distortion correction was used, and sampling error was controlled.4. In order to testify the quality of the system, some experiments for measuring different objects were made, and several factors affecting measurement accuracy were discussed in detail.