Comprehensive model for characterizing skin translucency by expert grading, panel evaluation and image analysis in a Chinese population / Di Qu in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 44, N° 5 (10/2022)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 44, N° 5 (10/2022) . - p. 500-513 Titre : Comprehensive model for characterizing skin translucency by expert grading, panel evaluation and image analysis in a Chinese population Type de document : document électronique Auteurs : Di Qu, Auteur ; Xiaojuan Wang, Auteur ; Jianwei Liu, Auteur ; Ziqi Wu, Auteur ; Carla Kuesten, Auteur ; Weiyi Hu, Auteur ; Hirono Totsuka, Auteur ; Yinbei Chen, Auteur Année de publication : 2022 Article en page(s) : p. 500-513 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image. Chinois(e)s Modèles numériques Peau -- analyse Peau -- Anatomie Peau -- Physiologie Statistiques Translucidité (optique) Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objectives : Translucent skin is an attribute widely appreciated by people in East Asian countries. There have been studies in the literature to describe the phenomenon by means of clinical grading, instrumental measurement and image analysis. However, due to its subjective and complex nature, skin translucency has not been comprehensively and rigorously characterized and modelled, particularly in the Chinese population. This study is to develop a mathematical model that quantitatively describes skin translucency from visual cues objectively measured from the skin. - Materials and Methods : The study was designed to characterize and model skin translucency by incorporating expert evaluation, panel perception and image analysis of multiple skin visual attributes in one analysis. Faces of 36 Chinese females aged 18–65 years old were evaluated by a dermatologist to obtain clinical translucency scores. Subject pairs were formed with a relatively high and low translucency score in each pair. Their faces were judged in person by 9 panellists in paired-comparison (2-AFC) fashion to pick a ‘more translucent skin’ from each subject pair. Front-view facial images of the subjects were taken, and multiple colour and other visually perceivable skin attributes were measured using image analysis. Bradley-Terry analysis and multiple regressions were performed to correlate the panel choices of ‘more translucent skin’ with the objectively measured skin parameters. - Results : Multiple skin colour properties affected the panel choices towards translucent skin. Among them skin tone lightness and skin glossiness had positive effects on skin translucency while the hue, colour unevenness, severity of red and dark spots affected it negatively. Subsurface light reflection and skin visual smoothness had some effect but were not statistically significant. A mathematical model was constructed to predict a person's skin translucency from objectively measured skin attributes. - Conclusion : The subjective property of skin translucency can be characterized and quantified via a comprehensive modelling process involving clinical grading, panel evaluation, image-based measurement of skin attributes and statistical analysis. A novel skin parameter, Skin Translucency Index (STI) was established, which provides a way to measure skin translucency, making it possible to assess treatment efficacy before and after product application. Note de contenu : - MATERIALS AND METHODS : Subjects and facility - Expert grading and skin colour measurement - Panel perception - Quantification of panel perception results - Image capture and analysis - Modelling - RESULTS AND DISCUSSION : Distributions of objectively measured skin visual attributes - Panel responses - Modelling - Validation of STI model - Application DOI : https://doi.org/10.1111/ics.12798 En ligne : https://drive.google.com/file/d/1TSp-NkxV6MaUpTS4php3e7dBzZDuuZLc/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38149 [article]

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Consistent determination of the contrast ratio of white inks / Danny C. Rich in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1501-1509 Titre : Consistent determination of the contrast ratio of white inks Type de document : texte imprimé Auteurs : Danny C. Rich, Auteur Année de publication : 2021 Article en page(s) : p. 1501-1509 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Blanc (couleur) Encre Mesures optiques Opacité (optique) Réflectance Translucidité (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Translucency is a critical property of print on flexible packaging. It forms the basis for obtaining full color gamut, hiding the contents of a package and even creating the scanner readable digital codes for point of purchase tracking. The print industry has followed the paint and decorative coatings industry, the paper industry and the plastics industry in attempting to identify measurement methods that will accurately describe translucency or its opposite, opacity. Both of these properties are defined in terms of the contrast ratio, the ratio of the luminous reflectance of a coating placed over a black and a white substrate. In this paper, the theory of diffuse reflectance spectroscopy is used to define the measurements used to determine the contrast ratio. A brief experimental study illustrates the strong points and weak points of traditional contrast ratio measurements. A better model of contrast ratio determination is hypothesized, and an experiment is designed and reported that demonstrates both the validity of the hypothesis and a method for obtaining consistent estimates of the contrast ratio. Note de contenu : - Table 1 : Luminous reflectance (Y) and contrast ratios of the same white ink printed on different substrates and backed with different white and black backings - Table 2 : Contrast ratio readings from three instruments DOI : https://doi.org/10.1007/s11998-021-00515-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00515-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36804 [article]

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Don't just look at it, measure it ! / Felix Schmollgruber in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/2011 (05/2011)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 5/2011 (05/2011) . - p.18-23 Titre : Don't just look at it, measure it ! : New ways of quantifying effect colours Type de document : texte imprimé Auteurs : Felix Schmollgruber, Auteur ; Matthew Adby, Auteur Année de publication : 2011 Article en page(s) : p.18-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couleur Mesure -- Instruments Revêtements Translucidité (optique) Index. décimale : 667.6 Peintures Résumé : Measuring and testing - Research and development work is being carried out today in a number of companies around the world on practical ways to measure the four attributes of effect paints: multi-angle colour, texture, gloss and translucency. Given the major strides that instrument manufacturers have taken over the past decade in providing more accurate and less expensive equipment, it is certain that they will provide affordable tools for the total capture of appearance for effect paints in both benchtop and handheld versions. Note de contenu : - Top priority: new measuring methods for effect paints - Agreed viewing and measurement conditions - “Click and render” function captures material characteristics - Capturing more of the total appearance - Limited resolution - Seeing the sample as a multispectral image - Optical qualities En ligne : https://drive.google.com/file/d/1gTBSZ2nHgOCpWs0uXYQgiDZY5pGW2DjE/view?usp=drive [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11708 [article]

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Mathematical and empirical evaluation of accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings / M. Gorji Bandpay in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1107-1115 Titre : Mathematical and empirical evaluation of accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings Type de document : texte imprimé Auteurs : M. Gorji Bandpay, Auteur ; Farhad Ameri, Auteur ; K. Ansari ; S. Moradian Année de publication : 2018 Article en page(s) : p. 1107-1115 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couleur Kubelka-Munk, Théorie de La théorie de Kubelka-Munk (du nom de Paul Kubelka et Franz Munk) décrit les propriétés d'absorption de la lumière et de diffusion de la lumière des systèmes pigmentés, tels que les peintures ou les colorants dans les tissus textiles. La théorie peut prédire à partir de mesures d'épaisseurs à deux couches comment la couleur fonctionne à d'autres épaisseurs de couche. Cela permet aux fabricants de peinture d'estimer combien de pigments ils doivent ajouter à une peinture, de sorte que la peinture est opaque à une certaine épaisseur du travail. Avec l'aide de la théorie, l'effet de couleur du mélange de deux colorants peut être prédit si les paramètres des colorants individuels sont déterminés au moyen de mesures spectroscopiques. Les résultats sont meilleurs que l'utilisation naïve du mélange de couleurs soustractif. Mathématiques Opacité (optique) Prévision, Théorie de la Revêtements:Peinture Translucidité (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Attempts were made to evaluate mathematically and empirically the accuracy of the Kubelka–Munk model for color match prediction of opaque and translucent surface coatings in the color using industries. To this end, an innovative inversed mathematical evaluation procedure was concocted which comprised of plotting the absorption and scattering constants of the Kubelka–Munk model or any of its various modified form or replacements theories against the intrinsic optical coefficients of the respective exact radiation transfer theories, namely Chandrasekhar for opaque and van de Hulst for translucent media. The results prove mathematically that the Kubelka–Munk model for opaque media is a sound theory and its various suggested modifications or replacements do not improve the color match prediction of opaque surface coating media. This mathematical conclusion was further confirmed by color match prediction of actual opaque paint samples. On the other hand, the mathematical prediction for translucent media illustrated a completely different picture, depicting nonlinearity between the optical constants and the respective concentrations of colorants. This implies that much further work has to be carried out to derive invertible new equations to enforce linearity to such situations or make use of alternative artificial intelligent procedures which are designed especially for nonlinearity. Note de contenu : - INTRODUCTION : Theoretical backgroung - MATHEMATICAL EVALUATION : Mathematical evaluation of the Kubelka-Munk model for opaque media - Mathematical evaluation of the Kubelka-Munk model for translucent media - EMPIRICAL MODIFICATION - MATERIALS AND METHODS - EXPERIMENTAL RESULTS AND DISCUSSION DOI : 10.1007/s11998-018-0056-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0056-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31139 [article]

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Optical test stand for measuring purposes of light guide properties of optical fibers / Markus Beckers in CHEMICAL FIBERS INTERNATIONAL, Vol. 62, N° 1 (03/2012)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 62, N° 1 (03/2012) . - p. 43-44 Titre : Optical test stand for measuring purposes of light guide properties of optical fibers Type de document : texte imprimé Auteurs : Markus Beckers, Auteur ; Niels Westweber, Auteur ; Wilhelm Steinmann, Auteur ; Thomas Vad, Auteur ; Benjamin Gauß, Auteur ; Matthias Künne, Auteur ; Gunnar Seide, Auteur ; Thomas Gries, Auteur Année de publication : 2012 Article en page(s) : p. 43-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibres optiques Mesures optiques Polymères Polymères -- Propriétés optiques Translucidité (optique) Index. décimale : 677.4 Textiles artificiels Résumé : For a cost-effective application of optical fibers in translucent composite materials, it is necessary to explore alternative materials. Cost reduction is only possible if substitutes for glass or PMMA can be found. ITA has the possibility of manufacturing commodity-polymer based monofilaments with increased light-transmission capabilities due to water quenching of melt-spun fibers. Furthermore, the characteristics of these fibers will be analyzed. This paper will focus properties and the way these measurements are carried out. En ligne : https://drive.google.com/file/d/1zva6p8HkcyVj9n5yTgMmC7hARiYvqbQC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15868 [article]

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Plastiques. Matières de base pour polyuréthannes, polyesters, polyéthers et isocyanates. Appréciation visuelle de la coloration en unités Gardner - Norme NF T 52-151 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1979)

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Tailor-made for LEDs / Bernd Sparenberg in KUNSTSTOFFE INTERNATIONAL, Vol. 105, N° 3 (03/2015)  

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A UFO lands in the home in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 9 (09/2018)  

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