期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 5
出版社：Copernicus Publications
摘要：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 focus and zoom. The newly developed zoom-dependent calibration approach is reviewed and the results of its application to the calibration of a number of off-the-shelf cameras are presented. The benefits of the approach for medium-accuracy close-range photogrammetry applications across fields as diverse as traffic accident reconstruction and heritage recording are then highlighted
关键词：self calibration; camera calibration; lens distortion; zoom lens
