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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 2 — Jan. 15, 2006
  • pp: 181–183

Depth from diffracted rotation

Adam Greengard, Yoav Y. Schechner, and Rafael Piestun  »View Author Affiliations

Optics Letters, Vol. 31, Issue 2, pp. 181-183 (2006)

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The accuracy of depth estimation based on defocus effects has been essentially limited by the depth of field of the imaging system. We show that depth estimation can be improved significantly relative to classical methods by exploiting three-dimensional diffraction effects. We formulate the problem by using information theory analysis and present, to the best of our knowledge, a new paradigm for depth estimation based on spatially rotating point-spread functions (PSFs). Such PSFs are fundamentally more sensitive to defocus thanks to their first-order axial variation. Our system acquires a frame by using a rotating PSF and jointly processes it with an image acquired by using a standard PSF to recover depth information. Analytical, numerical, and experimental evidence suggest that the approach is suitable for applications such as microscopy and machine vision.

© 2006 Optical Society of America

OCIS Codes
(100.6640) Image processing : Superresolution
(110.4850) Imaging systems : Optical transfer functions
(110.6880) Imaging systems : Three-dimensional image acquisition
(150.5670) Machine vision : Range finding

ToC Category:
Imaging Systems

Virtual Issues
Vol. 1, Iss. 2 Virtual Journal for Biomedical Optics

Adam Greengard, Yoav Y. Schechner, and Rafael Piestun, "Depth from diffracted rotation," Opt. Lett. 31, 181-183 (2006)

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