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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 6 — Jun. 27, 2013

Defocus map estimation from a single image via spectrum contrast

Chang Tang, Chunping Hou, and Zhanjie Song  »View Author Affiliations


Optics Letters, Vol. 38, Issue 10, pp. 1706-1708 (2013)
http://dx.doi.org/10.1364/OL.38.001706


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Abstract

We present an effective method for defocus map estimation from a single natural image. It is inspired by the observation that defocusing can significantly affect the spectrum amplitude at the object edge locations in an image. By establishing the relationship between the amount of spatially varying defocus blur and spectrum contrast at edge locations, we first estimate the blur amount at these edge locations, then a full defocus map can be obtained by propagating the blur amount at edge locations over the entire image with a nonhomogeneous optimization procedure. The proposed method takes into consideration not only the affect of light refraction but also the blur texture of an image. Experimental results demonstrate that our proposed method is more reliable in defocus map estimation compared to various state-of-the-art methods.

© 2013 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(100.2960) Image processing : Image analysis
(110.5200) Imaging systems : Photography
(330.4595) Vision, color, and visual optics : Optical effects on vision

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: April 4, 2013
Revised Manuscript: April 17, 2013
Manuscript Accepted: April 18, 2013
Published: May 14, 2013

Virtual Issues
Vol. 8, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Chang Tang, Chunping Hou, and Zhanjie Song, "Defocus map estimation from a single image via spectrum contrast," Opt. Lett. 38, 1706-1708 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-38-10-1706


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