Cross-ratio invariant based line scan camera geometric calibration with static linear data

A flexible new technique is proposed to calibrate the geometric model of a line scan camera. In this technique, the calibration pattern comprises two orthogonal planes; on each plane two groups of parallel feature lines are drawn. A single linear view of this pattern is captured by the line scan camera requiring calibration. Consequently, points crossed by the view plane and parallel lines are projected on the camera sensor. Then, two problems are addressed. Firstly, with the properties of cross-ratio, the corresponding spatial point coordinates are obtained. Secondly, using the point correspondences and line scan camera model, eight camera parameters are solved via two steps. Lens distortion is not taken into consideration. Compared with classical techniques, this newly proposed technique is easy to use and flexible.