The 3D optical measurement system based on Multi-frequency Heterodyne Principle

Because of its importance in automation production, the construction of 3D optical measurement system, based on binocular vision and phase projector, is paid more attentions. In order to avoid the errors from the Phase Shift and Gray Code, the Multi-frequency Heterodyne Principle (MHP) applied in the system. Caused by the projection limitation of light measurement system and the defects produced by the measurement of large objects pasted the circular markers on the surface for multiple registration, an automatic registration technology based on SIFT without markers, constructing the 3D optical measurement system with MHP and no markers (Scale Invariant Feature Transform) registration, getting the exact phase via fitting negative exponential and joining automatically by SIFT and SVD, put into application. The experiment results show that we are able to get the point cloud more accurately and achieve object automatic fusion faster by the system whose standard deviation is of less than 0.03 mm.