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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 14 — Jul. 15, 2009
  • pp: 2111–2113

Sharp-focus image restoration from defocused images

Aleksey N. Simonov and Michiel C. Rombach  »View Author Affiliations


Optics Letters, Vol. 34, Issue 14, pp. 2111-2113 (2009)
http://dx.doi.org/10.1364/OL.34.002111


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Abstract

We present a noniterative algorithm for sharp-focus image restoration from multiple defocused images having known relative defocus values between the image planes but unknown absolute defocus values with respect to the in-focus plane. Starting from an arbitrary value of defocus relative to the in-focus plane and using the optical transfer function, the algorithm evaluates the absolute defocus and retrieves the in-focus image of an incoherently illuminated planar object. Experiments with a circular-aperture imaging system confirm the efficiency and robustness of the algorithm. A reconstruction time of 100 ms is attained with two defocused 512 × 512   pixel images (captured by a 10  bit camera) on a 2.16 GHz laptop.

© 2009 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.2000) Image processing : Digital image processing
(100.3020) Image processing : Image reconstruction-restoration
(110.4850) Imaging systems : Optical transfer functions
(150.5670) Machine vision : Range finding

ToC Category:
Image Processing

History
Original Manuscript: March 4, 2009
Revised Manuscript: June 3, 2009
Manuscript Accepted: June 10, 2009
Published: July 7, 2009

Citation
Aleksey N. Simonov and Michiel C. Rombach, "Sharp-focus image restoration from defocused images," Opt. Lett. 34, 2111-2113 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-14-2111


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