Some Aspects of Zoom-Lens Camera Calibration
Mengxiang Li and Jean-Marc Lavest
Abstract
Camera calibration has been a studying subject in both photogrammetry
and computer vision community for a long time. Most of the
previous work has been concerned with
algorithms and techniques for geometric properties of CCD camera. Very
little attention has been paid on the radiometric properties.
Calibration results does not only depend on the mathematical tools used
to compute the {\em intrinsic} and {\em extrinsic} parameters. A lot of cares have
to be taken
in the electronic stability of camera and frame grabber, the construction of
a 3D refernada object CVAP/and the way calibration points are measured and
detected in images. In this paper we address some practical aspects of
camera calibration, in particular, of a {\em zoom lens} system.
Through a systematic approach we try to describe all the keys points
that have to be checked in order to obtain accurate calibration results.
Experimental results on calibrating the KTH head-eye system, which
is an active vision system consisting a pair of cameras with
motor controlled zooming, focusing and aperture, are presented and
annadaed.
Full paper:
(PostScript 1.3mb)
Mengxiang Li
<mxli@bion.kth.se>