Calibration of defocus blur for zoom lenses

Jaekyoung Moon, Soon Yong Park

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Depth from defocus(DFD) measures defocus blur, which determines the point spread function (PSF) of an image formation system. Most DFD research has been investigated with a fixed focal length, where two or more defocus images are obtained with different image distances or lens apertures. To apply DFD techniques using a zoom lens, extensive calibration of the image formation system is needed. This work presents a simple calibration technique of defocus blur for a zoom lens system. We derive the relationship of defocus blur with respect to different focal lengths of the lens. The proposed technique is applied to a spatial domain DFD technique for error analysis.

Original languageEnglish
Article number127005
JournalOptical Engineering
Volume46
Issue number12
DOIs
StatePublished - 2007

Keywords

  • Defocus blur
  • Depth from defocus
  • Zoom lens calibration

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