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Uneven Image Point Distribution in Camera Pre-Calibration and its Eects on 3D Reconstruction Errors
Umeå University, Faculty of Science and Technology, Department of Computing Science.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In camera pre-calibration, images of a calibration object are commonly used to determine the internal geometry of a camera. The calibration imaging is often optimized to have the calibration object cover as large image area as possible. This is likely to yield a larger concentration of measured image points near the center of the image sensor. In this report, the hypothesis is investigated that this non-uniform image point distribution results in a sub-optimal calibration. An area-based reweighting scheme is suggested to improve the calibration. Additionally, the effect of a choice between a 2D and a 3D calibration object is investigated.

A simulation study was performed where both a standard and area-weighted pre-calibration scheme was used in a parallel and a convergent scene. The estimated uncertainty and true errors were computed and compared to the first order predictions and results of perfect calibrations. The area-based calibration showed no reduction in estimation errors. Furthermore, the 3D calibration object did not give a noticeable improvement. However, for the standard and area-based calibrations, the true errors surpassed the estimated uncertainties by up to 26 and 58 percent, respectively.

Place, publisher, year, edition, pages
2017. , 17 p.
Series
UMNAD, 1109
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:umu:diva-136495OAI: oai:DiVA.org:umu-136495DiVA: diva2:1111624
Educational program
Master of Science Programme in Computing Science and Engineering
Supervisors
Examiners
Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2017-06-19Bibliographically approved

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fulltext(2054 kB)36 downloads
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf