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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6561–6574

Depth measurements through controlled aberrations of projected patterns

Gabriel C. Birch, J. Scott Tyo, and Jim Schwiegerling  »View Author Affiliations

Optics Express, Vol. 20, Issue 6, pp. 6561-6574 (2012)

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Three-dimensional displays have become increasingly present in consumer markets. However, the ability to capture three-dimensional images in space confined environments and without major modifications to current cameras is uncommon. Our goal is to create a simple modification to a conventional camera that allows for three dimensional reconstruction. We require such an imaging system have imaging and illumination paths coincident. Furthermore, we require that any three-dimensional modification to a camera also permits full resolution 2D image capture.Here we present a method of extracting depth information with a single camera and aberrated projected pattern. A commercial digital camera is used in conjunction with a projector system with astigmatic focus to capture images of a scene. By using an astigmatic projected pattern we can create two different focus depths for horizontal and vertical features of a projected pattern, thereby encoding depth. By designing an aberrated projected pattern, we are able to exploit this differential focus in post-processing designed to exploit the projected pattern and optical system. We are able to correlate the distance of an object at a particular transverse position from the camera to ratios of particular wavelet coefficients.We present our information regarding construction, calibration, and images produced by this system. The nature of linking a projected pattern design and image processing algorithms will be discussed.

© 2012 OSA

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(150.6910) Machine vision : Three-dimensional sensing

ToC Category:
Imaging Systems

Original Manuscript: December 16, 2011
Revised Manuscript: February 9, 2012
Manuscript Accepted: February 28, 2012
Published: March 6, 2012

Gabriel C. Birch, J. Scott Tyo, and Jim Schwiegerling, "Depth measurements through controlled aberrations of projected patterns," Opt. Express 20, 6561-6574 (2012)

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