Calibrating a Structured Light Stripe System: A Novel Approach

  • Authors:

  • D. Q. Huynh;R. A. Owens;P. E. Hartmann

  • Affiliations:

  • School of Information Technology, Murdoch University, Perth WA 6150 Australia. du@it.murdoch.edu.au/ d.huynh@murdoch.edu.au;Department of Computer Science, The University of Western Australia, Perth, WA 6907, Australia;Department of Biochemistry, The University of Western Australia, Perth, WA 6907, Australia

  • Venue:
  • International Journal of Computer Vision
  • Year:
  • 1999

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Abstract

The problem associated with calibrating a structured lightstripe system is that known world points on the calibration target donot normally fall onto every light stripe plane illuminated from theprojector. We present in this paper a novel calibration method thatemploys the invariance of the cross ratio to overcome this problem.Using 4 known non-coplanar sets of 3 collinear world points andwith no prior knowledge of the perspective projection matrix of thecamera, we show that world points lying on each light stripe planecan be computed. Furthermore, by incorporating the homographybetween the light stripe and image planes, the 4 × 3image-to-world transformation matrix for each stripe plane can alsobe recovered. The experiments conducted suggest that this novelcalibration method is robust, economical, and is applicable to manydense shape reconstruction tasks.