The technique of generating sinusoidal fringe patterns by defocusing squared binary structured ones has numerous merits for high-speed three-dimensional (3D) shape measurement. However, it is challenging for this method to realize a multifrequency phase-shifting (MFPS) algorithm because it is difficult to simultaneously generate high-quality sinusoidal fringe patterns with different periods. This paper proposes to realize an MFPS algorithm utilizing an optimal pulse width modulation (OPWM) technique that can selectively eliminate high-order harmonics of squared binary patterns. We successfully develop a 556 Hz system utilizing a three-frequency algorithm for simultaneously measuring multiple objects.
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Opt. Lett. 35(7) 934-936 (2010)
Song Zhang, Daniel Van Der Weide, and James Oliver
Opt. Express 18(9) 9684-9689 (2010)
Yuanzheng Gong and Song Zhang
Opt. Express 18(19) 19743-19754 (2010)