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Browsing by Subject "digital image correlation"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    An uncertainty analysis for developed measurement vision system aided by numerical simulations
    (2011) Holak, Krzysztof; Kohut, Piotr; Martowicz, Adam; Uhl, Tadeusz
    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.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    The use of digital image correlation in the study of Achilles tendon strain field
    (2015) Holak, Krzysztof; Kohut, Piotr; Młyniec, Andrzej; Tomaszewski, Krzysztof; Uhl, Tadeusz; Ekiert, Martyna
    This paper presents an application of a vision-based measurement method in the experimental mechanics of biological materials. The displacement and strain fields of a human Achilles tendon specimen under a tensile test were computed using the digital image correlation method. Different software applications, both commercial and open source, were compared. The performance of algorithms was tested based on a referential measurement carried out by commercial software with the affine model of deformation implemented. The root mean square error of the difference between strain obtained using the reference measurement and each of the analyzed programs was computed. Additionally, an example of a full-field computation of displacement and strain field was presented.