High-speed 3D surface measurement of rear lamp housing by automatic digital fringe projection system

Digital fringe projection method is widely used in industrial applications with high-speed measurement and high resolution. In this study, a fully automatic high-speed digital fringe projection system is presented to profile 3D surface characteristic of rear lamp housing of vehicle. The structured light with fringe pattern is used to be the light source in the measurement system and is projected by a digital light processing projector. The distorted fringe patterns from the surface of lamp housing are captured by the digital camera. The absolute phase maps are calculated by using phase-shifting and quality guided path unwrapping algorithm. A complete 3D feature of lamp housing is obtained by our system. We achieved simultaneous phase acquisition, reconstruction and 3D exhibition at a speed of 0.5 s. This system can provide a high accuracy and real-time 3D surface measurement for the automobile industry.