A Structured Light Based 3D Imaging System Design Implementation and Evaluation

Structured light projection is a non-contact optical technique for acquiring high-precision three-dimensional surface information. This paper presents the design and implementation of a compact and cost-effective structured-light-based 3D imaging system for measuring surface topography. Key components such as phase-shifting sinusoidal pattern projection, robust camera calibration, and phase unwrapping algorithms are investigated in detail. The system integrates a CCD camera, LCD projector, industrial aluminum frame, and 3D-printed test objects into a complete measurement platform. Experimental results demonstrate that the system is capable of reconstructing fine surface features with sub-millimeter resolution across various targets. The proposed setup provides a reproducible, affordable, and educationally valuable pathway for entry-level research in 3D optical imaging and fringe-based metrology.