Looking into special surface effects : diffuse coarseness and glint impression / Zihao Winston Wang in COLORATION TECHNOLOGY, Vol. 132, N° 2 (04/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 2 (04/2016) . - p. 153-161 Titre : Looking into special surface effects : diffuse coarseness and glint impression Type de document : texte imprimé Auteurs : Zihao Winston Wang, Auteur ; Ming Ronnier Luo, Auteur Année de publication : 2016 Article en page(s) : p. 153-161 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Granulosité  Réflectance  'Techniques  psychophysiques'  Surface  'Effets  spéciaux'  'Perception  visuelle'  'Eclairage  diffus'  unidirectionnel'  'Analyse  dimensionnelle  Glint'  Reflet Index. décimale : 667.3 Teinture et impression des tissus Résumé : Diffuse coarseness (graininess) and glint impression (sparkle) are two aspects of visual perception for special-effect materials, including car finishes, etc. Previous work has shown that these two attributes become apparent when illuminated under two distinct illumination conditions: diffuse and unidirectional illumination respectively. The effect of glint impression has significant dependency on the viewing geometry. In this work, three psychophysical experiments were carried out, including diffuse coarseness assessment, glint impression assessment, and finding dimensions of glint space. In the experiments, one geometry for diffuse coarseness and three geometries for glint impression were designed. The three viewing geometries were designed according to a commercial device, BYK-mac, so that the results were used to test the reliability of instrumental measurements. Based on the conclusions drawn from the psychophysical experiments, a further investigation on glint space was conducted using the multidimensional scaling technique. From the visual results, two dimensions, corresponding to two attributes, were extracted and were validated by the instrumental results. Bidirectional reflectance distribution function data were also adopted from another commercial device, Imaging Sphere from Radiant Vision Systems Inc., USA (originally RadiantZemax Inc.), to predict glint impression. Some promising results were obtained. Note de contenu : - EXPERIMENTAL : Samples - Observers - Viewing conditions - Psychophysical techniques - RESULTS AND DISCUSSION : Repeatability and reproductibility - Testing the instrument performance - Glint dimensionality analysis DOI : 10.1111/cote.12203 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12203 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25866 [article]

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