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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 1 — Jan. 3, 2011
  • pp: 261–270

Autofocus using image phase congruency

Yibin Tian  »View Author Affiliations

Optics Express, Vol. 19, Issue 1, pp. 261-270 (2011)

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The key issue in passive autofocus is to choose robust focus measures to judge optical blur in defocused images. Existing focus measures are sensitive to image contrast (illumination) as they use image intensity. In this report we demonstrate a focus measure using phase congruency. The proposed focus measure is robust for noisy imaging sensors in varying illumination conditions, and has great balance of defocus sensitivity and effective range. Its advantages are shown with a number of synthetic image sequences.

© 2010 OSA

OCIS Codes
(100.2000) Image processing : Digital image processing
(110.3000) Imaging systems : Image quality assessment
(110.5200) Imaging systems : Photography
(110.3925) Imaging systems : Metrics

ToC Category:
Imaging Systems

Original Manuscript: November 1, 2010
Revised Manuscript: December 17, 2010
Manuscript Accepted: December 17, 2010
Published: December 22, 2010

Yibin Tian, "Autofocus using image phase congruency," Opt. Express 19, 261-270 (2011)

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