A high-speed fringe projection profilometry employing defocused binary fringe is presented to record the 3-D sign language, including gesture and mouth movement, to help people learn the sign language. It employs a number of advanced approaches, such as fringes binarization and defocus method, high precision phase calculation based on the phase-shifting method and the three pitches heterodyne unwrapping (TPHU) method, and how to combine multiple binary fringes into a 24-bit fringe. Experiments have shown that the proposed system can acquire and display high-quality 3D gesture and mouth movement at a speed of 500 frames per second.
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This work has been supported by the National Natural Science Foundation of China (No.51275405).
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Wang, J., Zhou, Y. & Yang, Y. Sign language learning based on high-speed fringe projection profilometry employing defocused binary fringe. Optoelectron. Lett. 16, 65–74 (2020). https://doi.org/10.1007/s11801-020-9040-2