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12 September 2014 3D shape measurement with binary phase-shifted technique and digital filters
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Adriana Silva, Ricardo Legarda-Saenz, G. García-Torales, Sandra Balderas-Mata, and 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);

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