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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 1 — Jan. 29, 2008

Performance of focus measures in the presence of nondefocus aberrations

Yibin Tian, Kevin Shieh, and Christine F. Wildsoet  »View Author Affiliations


JOSA A, Vol. 24, Issue 12, pp. B165-B173 (2007)
http://dx.doi.org/10.1364/JOSAA.24.00B165


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Abstract

The purposes of the study were to compare the performance of ten representative focus measures in the presence of nondefocus aberrations and to evaluate their applicability to the eye. For fixed amounts of nondefocus aberrations, the amount of defocus was changed to generate a series of blurred images from which focus measure curves were derived. In the presence of small amounts of nondefocus aberrations, all focus measures showed unimodal and monotonic behavior, although there were large differences in their sensitivity to defocus and effective ranges. There were breakdowns in monotonicity and unimodality for some focus measures when applied to data from human eyes, while other focus measures could detect the shift in the best-focus plane in the blurred image series resulting from spherical aberration.

© 2007 Optical Society of America

OCIS Codes
(110.3000) Imaging systems : Image quality assessment
(170.0110) Medical optics and biotechnology : Imaging systems
(330.5370) Vision, color, and visual optics : Physiological optics
(330.7310) Vision, color, and visual optics : Vision

History
Original Manuscript: March 5, 2007
Revised Manuscript: July 13, 2007
Manuscript Accepted: September 24, 2007
Published: November 8, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Yibin Tian, Kevin Shieh, and Christine F. Wildsoet, "Performance of focus measures in the presence of nondefocus aberrations," J. Opt. Soc. Am. A 24, B165-B173 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-24-12-B165

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