1 December 2007 Calibration of defocus blur for zoom lenses
Author Affiliations +
Optical Engineering, 46(12), 127005 (2007). doi:10.1117/1.2823155
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.
Jaekyoung Moon, Soon-Yong Park, "Calibration of defocus blur for zoom lenses," Optical Engineering 46(12), 127005 (1 December 2007). https://doi.org/10.1117/1.2823155


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