SOME ASPECTS OF ZOOM LENS CAMERA CALIBRATION

Zoom lens camera calibration is an important and difficult problem for two reasons at least. First, the intrinsic parameters of such a camer a change over time, it is difficult to calibrate them online. Secondly , the pin-hole model for single lens system can not be applied directl y to a zoom lens system. In this paper, we address some aspects of thi s problem, such as determining principal point by zooming, modeling an d calibration of lens distortion and focal length, as well as some pra ctical aspects. Experimental results on calibrating cameras with compu ter controlled zoom, focus and aperture are presented.