An optical method for assessing scratch damage in bulk materials and coatings

For some applications, the most important property of a scratch in a surface or coating is the visual perception of that scratch by a human observer. A method is proposed to predict the visual impact of scratch damage from measurements of geometrical dimensions and changes in grey level. A ‘logarith...

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Veröffentlicht in:Surface & coatings technology 2003-02, Vol.165 (2), p.186-193
Hauptverfasser: Hutchings, I.M, Wang, P.Z, Parry, G.C
Format: Artikel
Sprache:eng
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Zusammenfassung:For some applications, the most important property of a scratch in a surface or coating is the visual perception of that scratch by a human observer. A method is proposed to predict the visual impact of scratch damage from measurements of geometrical dimensions and changes in grey level. A ‘logarithmic instrumental visibility’, V i , is defined by V i =log∫Δ G 2.5d A where Δ G is the difference in grey level between the scratched region and the surrounding background, and A is the area of the scratch. This objective measure is shown to correlate well with more subjective estimates of visibility, as perceived by human observers, for a wide range of simulated scratch images and also for real scratches in smooth-surfaced filled polyolefin sheets.
ISSN:0257-8972
1879-3347
DOI:10.1016/S0257-8972(02)00584-4