12 September 2014 3D shape measurement with binary phase-shifted technique and digital filters
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Abstract
Shape measurements by sinusoidal phase-shifting methods require high-quality sinusoidal fringes. Furthermore, most of the video projectors are nonlinear, making it difficult to generate high quality phase without nonlinearity calibration and correction. To overcome the limitations of the conventional digital fringe projection techniques, we proposed a method that involves the projection of digital binary patterns generated by the pulse-width modulation (PWM). We will demonstrate that applying digital filtering, in particular, low pass filters, one can obtain a high-quality sinusoidal pattern. Which in combination with phase-shifting methods, allows a reliable 3-D profiling surface reconstruction at large timerates. Validation experiments using a commercial video projector are presented.
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Adriana Silva, Adriana Silva, Ricardo Legarda-Saenz, Ricardo Legarda-Saenz, G. García-Torales, G. García-Torales, Sandra Balderas-Mata, Sandra Balderas-Mata, Jorge L. Flores, Jorge L. Flores, } "3D shape measurement with binary phase-shifted technique and digital filters", Proc. SPIE 9219, Infrared Remote Sensing and Instrumentation XXII, 92190L (12 September 2014); doi: 10.1117/12.2062479; https://doi.org/10.1117/12.2062479
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