Conference Proceedings

Zoom-dependent calibration for consumer grade-cameras

SS Al-Ajlouni, CS Fraser

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Published : 2006

Abstract

A significant practical constraint currently applying to the adoption of consumer-grade digital cameras for photogrammetric measurement is the requirement to record images at fixed zoom and focus settings. This is a consequence of the variation of camera calibration parameters, especially principal distance and lens distortion, with changing zoom and focus. This paper describes a zoom-dependent calibration model, in which the image coordinate correction equations for departures from collinearity are expressed as a function of the nominal focal length written to the EXIF header of the images. Such a calibration approach frees the user from the constraint of recording images with both fixed fo..

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