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actual wear-life in specific end uses, unless there are data showing the specific relationship between
laboratory abrasion tests and actual wear in the intended end-use.
According to [2], the main drawback of the subjective methods based on estimation by experts is
their inconsistency and the inaccuracy of the rating results. Henceforward, there is still today a need
for devising objective evaluation methods, relying in automatic and non-intrusive pilling
measurement. [ CITATION Fur15 l 1061 ]
With the aim of speeding up the pilling measurement procedure and, at the same time, to increase
the reliability of the visual control, in the last years a number of Machine Vision (MV) systems
have been proposed in order to overcome the limitations of traditional, visually-based, pilling
measurement.
On the basis of the most relevant results obtained in this field, the present paper provides a rational
and chronological review of the most promising methods proposed so far
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