PSI - Issue 37

Tomasz Rogala et al. / Procedia Structural Integrity 37 (2022) 187–194 / Structural Integrity Procedia 00 (2019) 000 – 000

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be smooth. It also shows that with slight changes in the original object significantly different in shape from the reference object, significant differences in features in the two-dimensional space will be observed.

Fig. 3. Subsequent operation of changing three-dimensional object representation into dimensional representation. a) Original object (in the form of a synthetic cuboid) and its equivalent ellipsoid b) boolean product operation c) surface meshing of the product of boolean operation d) the image of an object in two dimensional space obtained using applied formula

Fig. 4. Subsequent operations of image processing in order to obtain binary image

In order to make possible of using appropriate definitions of morphological features for a 2D image, this image is processed into a binary image in the next steps. For this purpose, the techniques available in the Matlab® package - Image Processing Toolbox (MathWorks, Natick, MA, USA) were used. Figure 5 shows the successive steps of the processing of a surface mesh containing coordinates into a binary image. For processing, morphological erosion and dilation operations and morphological closing were used. Figure 5 shows in sequence all the transformation operations of the real object related to the fracture, including the transformation of the object and its two-dimensional image. For the prepared 2d images of objects, a set of definitions of the features of two-dimensional images has been defined. For this purpose, 42 definitions of features were prepared, which implementations made it possible to