AN UNCERTAINTY ANALYSIS FOR DEVELOPED MEASUREMENT VISION SYSTEM AIDED BY NUMERICAL SIMULATIONS

Authors

  • Krzysztof Holak AGH University of Science and Technology
  • Piotr Kohut AGH University of Science and Technology
  • Adam Martowicz AGH University of Science and Technology
  • Tadeusz Uhl AGH University of Science and Technology

Keywords:

digital image correlation, homography transformation, vision system, deflection measurement

Abstract

The paper presents an optical non-contact method of measuring the static deflection structure in one plane. Displacements of measurement points of the structure under the load were computed by means of digital image correlation coefficient. The application of homography mapping enabled the deflection field to be computed from two images of the structure acquired from two distinct points in space. The model of the developed vision system were implemented and simulated in the MATLAB programming tool. The impact of the corner detector inaccuracy on the measurement results was investigated. The uncertainty propagation of the developed method was examined in a series of simulations. The distance of the camera and the focal length were investigated parameters of the system. In the paper, the variability of homography components as well as variability of displacements measured in each of the points of interest are presented.

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References

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Published

2011-06-26

Issue

Vol. 30 No. 2 (2011)

Section

Articles

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