Development of an image-based measurement instrument for gloss characterization / Stijn Beuckels in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1567-1582 Titre : Development of an image-based measurement instrument for gloss characterization Type de document : texte imprimé Auteurs : Stijn Beuckels, Auteur ; Jan Audenaert, Auteur ; Peter Hanselaer, Auteur ; Frédéric Bernard Leloup, Auteur Année de publication : 2022 Article en page(s) : p. 1567-1582 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Caractérisation Mesure -- Instruments Index. décimale : 667.9 Revêtements et enduits Résumé : Gloss is one of the main attributes to describe the appearance of surfaces and objects, as it contributes to the general quality perception. Gloss is a multidimensional quantity of which ‘specular gloss’ is the most commonly applied attribute. Specular gloss meters are standardized and widely used in industry. However, their readings correlate only partially to the general visual gloss impression, which also comprises distinctness-of-the-reflected-image (DOI), haze, contrast and surface-uniformity attributes. This study presents a more profound image-based gloss meter (iGM) which incorporates a CMOS camera detector. This concept is not new, but limited research has been conducted on the inclusion of various image processing evaluations for gloss attributes. The designed iGM is compatible to 60° specular gloss meter standards. The CMOS detector captures the reflected source image, which is processed to measure four perceptual attributes of surface gloss. The obtained results validate the 60° specular gloss evaluation and indicate a promising capability in characterizing DOI, haze, and contrast. Contrast is an important attribute that is not available yet in industrial gloss meters. It is measured using a diffuse aspecular light source. Generally, this iGM maintains the hardware principles of specular gloss meters, while evolving toward a representative gloss perception meter. Note de contenu : - Design of the iGM : Optical design - Spectral characteristics - Mechanical design - Characterization of the iGM - Results : Test samples - Specular gloss - Distinctness-of-image (DOI) - Haze - Contrast - Table 1 : A summary of available measurement metrics is given for the selected perceptual attributes of surface gloss - Table 2 : Comparison of the gloss values, for the first two samples sets, obtained with the iGM, the Rhopoint IQ (GM1) and the BYK-Gardner micro-TRI gloss meter (GM2) - Table 3 : Measurements results for DOI and haze (see below section) metrics on the Alanod 1100G sample are presented for the IQ and the iGM DOI : https://doi.org/10.1007/s11998-022-00629-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00629-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38290 [article]

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