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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 13 — May. 1, 2004
  • pp: 2709–2721

Phase plate to extend the depth of field of incoherent hybrid imaging systems

Sherif S. Sherif, W. Thomas Cathey, and Ed R. Dowski  »View Author Affiliations


Applied Optics, Vol. 43, Issue 13, pp. 2709-2721 (2004)
http://dx.doi.org/10.1364/AO.43.002709


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Abstract

A hybrid imaging system combines a modified optical imaging system and a digital postprocessing step. We describe a spatial-domain method for designing a pupil phase plate to extend the depth of field of an incoherent hybrid imaging system with a rectangular aperture. We use this method to obtain a pupil phase plate to extend the depth of field, which we refer to as a logarithmic phase plate. Introducing a logarithmic phase plate at the exit pupil of a simulated diffraction-limited system and digitally processing the detector’s output extend the depth of field by an order of magnitude more than the Hopkins defocus criterion. We also examine the effect of using a charge-coupled device optical detector, instead of an ideal optical detector, on the extension of the depth of field. Finally, we compare the performance of the logarithmic phase plate with that of a cubic phase plate in extending the depth of field of a hybrid imaging system with a rectangular aperture.

© 2004 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(110.0110) Imaging systems : Imaging systems
(110.6880) Imaging systems : Three-dimensional image acquisition

History
Original Manuscript: July 22, 2003
Revised Manuscript: January 20, 2004
Published: May 1, 2004

Citation
Sherif S. Sherif, W. Thomas Cathey, and Ed R. Dowski, "Phase plate to extend the depth of field of incoherent hybrid imaging systems," Appl. Opt. 43, 2709-2721 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-13-2709

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