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Automated metric calibration of colour digital cameras
Author(s) -
Cronk Simon,
Fraser Clive,
Hanley Harry
Publication year - 2006
Publication title -
the photogrammetric record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 51
eISSN - 1477-9730
pISSN - 0031-868X
DOI - 10.1111/j.1477-9730.2006.00380.x
Subject(s) - computer vision , bundle adjustment , artificial intelligence , photogrammetry , computer science , calibration , orientation (vector space) , zoom , rgb color model , digital camera , camera resectioning , process (computing) , metric (unit) , computer graphics (images) , engineering , mathematics , statistics , geometry , operations management , petroleum engineering , lens (geology) , operating system
Consumer‐grade digital cameras have become commonplace and with calibration there is significant potential for their use in photogrammetric applications. This paper describes a new method for automatic camera calibration, which is suited to colour digital cameras. Two innovations are central to the developed process. The first is exploitation of RGB colour attributes in the design of automatically detected and identified coded targets. The second is a new approach to initial value determination for relative orientation, which then supports fully automatic initial network exterior orientation and subsequent bundle adjustment with self‐calibration. Accuracy aspects are also touched upon and the impact of chromatic aberration is discussed. Finally, an example of the automatic calibration process, which is implemented in the iWitness system, is presented for the case of multiple zoom settings of a consumer‐grade digital camera.