Key concepts for phase-to-coordinate conversion in fringe projection systems
What's it about?
Fringe projection is a powerful method for noncontact and accurate measurement of three-dimensional objects. However, to design or optimally use a fringe projection system, the fundamental operating principles must be carefully taken into account. In this work, the operation of fringe projection system with the camera and projector arranged arbitrarily is modeled using four key concepts.
Why is it important?
This paper provides an insightful framework to design or implement a fringe projection system by formalizing four essential concepts. Namely, cameras and projectors as direction sensors, gratings as coordinate-encoding devices, absolute phase, and triangulation. With this approach, a generalized phase-to-coordinate conversion algorithm is straightforward to get. The derived conversion method is valid for systems with the camera and the projector arranged arbitrarily.