Microscopic structured light 3D profilometry: Binary defocusing technique vs. sinusoidal fringe projection

This paper compares the binary defocusing technique with conventional sinusoidal fringe projection under two different 3D microscopic profilometry systems: (1) both camera and projector use telecentric lenses and (2) only camera uses a telecentric lens. Our simulation and experiments found that the binary defocusing technique is superior to the traditional sinusoidal fringe projection method by improving the measurement resolutiori approximately 19%. Finally, by taking the speed advantage of the binary defocusing technique, we presented a high-speed (500 Hz) and high-resolution (1600 x 1200) 3D microscopic profilometry system that could reach kHz. (C) 2016 Elsevier Ltd. All rights reserved.