Self-calibration of Scheimpflug cameras: an easy protocol

The problem of the self-calibration of Scheimpflug cameras is addressed. The approach aims to calibrate by handpositioning a roughly-known calibration pattern, thanks to a bundle adjustment technique. The purpose of this paper is to design an easy protocol accordingly. A simple motion of the calibration target is introduced and a minimal number of recordings are obtained from the simulated data. The precision required for the calibration pattern is also discussed. Finally, the suggested protocol is tested in real conditions, especially in the stereo particle image velocimetry configuration.

[1]  Sebastien Coudert,et al.  Back-projection algorithm with misalignment corrections for 2D3C stereoscopic PIV , 2001 .

[2]  Z. C. Liu,et al.  Distortion compensation for generalized stereoscopic particle image velocimetry , 1997 .

[3]  Andrew W. Fitzgibbon,et al.  Bundle Adjustment - A Modern Synthesis , 1999, Workshop on Vision Algorithms.

[4]  Fulvio Scarano,et al.  S-PIV comparative assessment: image dewarping+misalignment correction and pinhole+geometric back projection , 2005 .

[5]  Cécile Barat,et al.  Scheimpflug Self-Calibration Based on Tangency Points , 2006 .

[6]  Nicholas J. Lawson,et al.  Three-dimensional particle image velocimetry: experimental error analysis of a digital angular stereoscopic system , 1997 .

[7]  Richard Szeliski,et al.  Vision Algorithms: Theory and Practice , 2002, Lecture Notes in Computer Science.

[8]  Larry S. Davis,et al.  Model-based object pose in 25 lines of code , 1992, International Journal of Computer Vision.

[9]  A. Prasad,et al.  Scheimpflug stereocamera for particle image velocimetry in liquid flows. , 1995, Applied optics.

[10]  Markus Raffel,et al.  Particle Image Velocimetry: A Practical Guide , 2002 .

[11]  Michel Dhome,et al.  Do We Really Need an Accurate Calibration Pattern to Achieve a Reliable Camera Calibration? , 1998, ECCV.

[12]  Bernhard Wieneke,et al.  Stereo-PIV using self-calibration on particle images , 2005 .

[13]  Christian Willert,et al.  Stereoscopic Digital Particle Image Velocimetry for Application in Wind Tunnel Flows , 1997 .

[14]  F. Collange,et al.  Self-Calibration of PIV Video-Cameras in Scheimpflug Condition , 2004 .