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Optical Engineering

Cross-ratio–based line scan camera calibration using a planar pattern
Author(s): Dong Dong Li; Gongjian Wen; Shaohua Qiu
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Paper Abstract

A flexible new technique is proposed to calibrate the geometric model of line scan cameras. In this technique, the line scan camera is rigidly coupled to a calibrated frame camera to establish a pair of stereo cameras. The linear displacements and rotation angles between the two cameras are fixed but unknown. This technique only requires the pair of stereo cameras to observe a specially designed planar pattern shown at a few (at least two) different orientations. At each orientation, a stereo pair is obtained including a linear array image and a frame image. Radial distortion of the line scan camera is modeled. The calibration scheme includes two stages. First, point correspondences are established from the pattern geometry and the projective invariance of cross-ratio. Second, with a two-step calibration procedure, the intrinsic parameters of the line scan camera are recovered from several stereo pairs together with the rigid transform parameters between the pair of stereo cameras. Both computer simulation and real data experiments are conducted to test the precision and robustness of the calibration algorithm, and very good calibration results have been obtained. Compared with classical techniques which use three-dimensional calibration objects or controllable moving platforms, our technique is affordable and flexible in close-range photogrammetric applications.

Paper Details

Date Published: 20 January 2016
PDF: 10 pages
Opt. Eng. 55(1) 014104 doi: 10.1117/1.OE.55.1.014104
Published in: Optical Engineering Volume 55, Issue 1
Show Author Affiliations
Dong Dong Li, National Univ. of Defense Technology (China)
Gongjian Wen, National Univ. of Defense Technology (China)
Shaohua Qiu, National Univ. of Defense Technology (China)


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