Vormistamine ülesanne 2
This process is usually, in its turn, aimed
at determining parameters such as the number and the density of pills and/or the area occupied by
the pills on the fabric surface. Once this task is performed, pilling grade is obtained as a parameter
inferred from the number of pills, or by comparing the pilled fabric with a reference fabric (either
with or without pills). As a matter of fact, almost all methods classified in this category use, at some
point, an image binarization by applying one or more thresholds and, possibly, morphological
operations on images. In Figure 4 an exemplificative flow diagram characterizing this category of
methodologies is shown.
An early work dealing with image segmentation was carried out by Konda et al. in 1990 [7]; images
of fabric samples, pilled using Martindale equipment, were acquired using a commercial camera
under near-tangential illumination thus obtaining images with high pill-to-background contrast.
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