Journal
OPTICS LETTERS
Volume 35, Issue 21, Pages 3682-3684Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.003682
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- Programa de Desarrollo de Ciencias Basicas (Uruguay)
- Comision Sectorial de Investigacion Cientifica (CSIC, UdelaR, Uruguay)
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Shape measurements by fringe projection methods require high-quality sinusoidal fringes. We present a sinusoidal fringe generation technique that utilizes slightly defocused binary fringe projection. The proposed method is a spatial version of the well-known pulse-width modulation (PWM) technique of electrical engineering. PWM is easy to implement using off-the-shelf projectors, and it allows us to overcome the gamma problem (i.e., the nonlinear projector response) in the output light intensity. We will demonstrate that, with a small defocusing level-lower than with other techniques proposed in the literature-a high-quality sinusoidal pattern is obtained. Validation experiments using a commercial video projector are presented. (C) 2010 Optical Society of America
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