“…The digital images taken during the performed experiment or investigation represent the input data. The use of digital image processing and analysis methods for the purpose of localization of cracks is considered to be a common procedure (Adhikari et al, 2014;Li et al, 2013Li et al, , 2011Valença et al, 2013). The conventional techniques, such as thresholding and subsequent mathematical morphology procedures without any previous supporting classification, often lead to development of complex algorithms in order to deal with various difficulties such as noise, formation of parasitic spurs, non-uniform illumination, and poor resolution (Wong et al, 2006;Yazid and Arof, 2013).…”