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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 21 — Nov. 1, 2010
  • pp: 3682–3684

Pulse-width modulation in defocused three-dimensional fringe projection

Gastón A. Ayubi, Jaime A. Ayubi, J. Matías Di Martino, and José A. Ferrari  »View Author Affiliations

Optics Letters, Vol. 35, Issue 21, pp. 3682-3684 (2010)

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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.

© 2010 Optical Society of America

OCIS Codes
(100.5070) Image processing : Phase retrieval
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis

ToC Category:
Image Processing

Original Manuscript: August 6, 2010
Manuscript Accepted: September 28, 2010
Published: October 28, 2010

Gastón A. Ayubi, Jaime A. Ayubi, J. Matías Di Martino, and José A. Ferrari, "Pulse-width modulation in defocused three-dimensional fringe projection," Opt. Lett. 35, 3682-3684 (2010)

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