Self-calibration with varying focal length from two images obtained by a stereo head

J. S. Liu*, Jen-Hui Chuang

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations


The self-calibration approach based on the absolute conic or its dual, the absolute dual quadric, has the merit of allowing the intrinsic camera parameters to vary in image sequence. In this paper, we show that certain linear equations resulting from the infinity homography can be added to a system of originally undetermined linear equations to find the absolute dual quadric for a stereo head. The special stereo configurations considered here allow one camera to rotate around either one or two of the coordinate axes defined by another camera. Experiments with synthetic images show that satisfactory results can be obtained with only the proposed linear methods. For real images obtained with non-ideal stereo configurations, and possibly with measurement noises, results obtained from the proposed linear methods may serve as reasonable initial guesses for some non-linear optimization procedure.

Original languageEnglish
Pages (from-to)2937-2948
Number of pages12
JournalPattern Recognition
Issue number12
StatePublished - 1 Dec 2002


  • Absolute conic
  • Infinity homography
  • Self-calibration
  • Stereo vision

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