This video describes the fundamentals of digital fringe projection techniques, which provide dense 3D measurements of dynamically changing surfaces. It also demonstrates the design and operation of a high-speed binary defocusing system based on these techniques.
Ekstrand, L., Karpinsky, N., Wang, Y., Zhang, S. High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques. J. Vis. Exp. (82), e50421, doi:10.3791/50421 (2013).