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Derivation of an instrumentally based geometric appearance index for the automotive industry / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
[article]
Titre : Derivation of an instrumentally based geometric appearance index for the automotive industry Type de document : texte imprimé Auteurs : Fereshteh Mirjalili, Auteur ; Siamak Moradian, Auteur ; Farhad Ameri, Auteur Année de publication : 2014 Article en page(s) : p. 853-864 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Vernis
Brillance (optique)
Evaluation visuelle
Imagerie (technique)
Vernis -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : In the present study, attempts were made to develop an index of geometric appearance capable of accurately predicting and quantifying the visually perceived geometric aspects of appearance of achromatic automotive finishes. To this end, three previously prepared individual scales for the three most significant geometric appearance attributes, namely specular gloss, distinctness of image (DOI), and orange peel for each of a series of metallic black, metallic gray, metallic silver, and solid white automotive finishes were utilized. The differences in each attribute were quantified visually by a panel of 16 observers, in terms of a lightness difference of an also previously prepared lightness scale. The innovative use of a common lightness scale showed that there is a surprisingly good correlation between the instrumentally measured specular gloss, DOI, and the LW parameter of the Wave scan instrument and the corresponding visually evaluated equivalents at the four investigated achromatic levels through minimizing observer errors and enhancing accuracy of the perceptibility procedure. These high accuracies made provisions for the implementation of the principle of additivity which led to the derivation of a geometric appearance index (GAI).
However, before its derivation, one instrumentally measured parameter was remodeled exponentially to define an innovative parameter chosen to be named "percent absence of orange peel". The proposed GAI illustrates high correlation with visual assessments and is herewith recommended as a stand-alone index for predicting the geometric appearance of automotive finishes. Furthermore, this index together with a
chromatic appearance index could form the foundation for deriving a total appearance index for the automotive industry.Note de contenu : - Preparation of appearance attribute scales
- Instrumental characterization
- The design common lightness scale for visual assessmentsDOI : 10.1007/s11998-014-9608-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9608-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22309
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Code-barres Cote Support Localisation Section Disponibilité 16659 - Périodique Bibliothèque principale Documentaires Disponible Effect of color on some geometric attributes of visual appearance of non-effect coatings / Ali Mohammadalizadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)
[article]
Titre : Effect of color on some geometric attributes of visual appearance of non-effect coatings Type de document : texte imprimé Auteurs : Ali Mohammadalizadeh, Auteur ; Farhad Ameri, Auteur ; Siamak Moradian, Auteur ; Fereshteh Mirjalili, Auteur Année de publication : 2020 Article en page(s) : p. 949-961 Note générale : Bibliogr. Langues : Américain (ame) 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.
Analyse de varianceEn statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire).
Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia)
Aspect peau d'orange (peinture)
Brillance (optique)
Couleur
Evaluation visuelle
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The aim of the present study was to investigate the effect of color attributes of appearance on the corresponding geometric attributes of appearance of non-effect coatings. Three scales, namely gloss, distinctness of image, and orange peel for three achromatic (black, gray, and white) and four chromatic (red, green, blue, and yellow) basecoats, each at varying levels, were prepared. The gloss and the distinctness of image scales had a sample with a maximum degree of gloss and distinctness of image, respectively, and the orange peel scale had a sample with a minimum degree of orange peel, which was considered to be the standard sample. The visual differences between the standard sample and those remaining in each scale were assessed by a panel of 28 observers using a prepared one-dimensional lightness scale based on the CIELAB and CIEDE2000 color difference equations. The correlations between visual and instrumental measurements of scales were checked, and instrumental performance with respect to visually assessed equivalent differences in gloss, distinctness of image, and orange peel were determined, giving STRESS (standardized residual sum of squares) values = 24.3, 11.6, and 9.7, respectively, in terms of CIELAB. ANOVA together with simple, lasso, and ridge regressions were applied to test the effect of color on the geometric attributes of appearance. The results illustrate that color attributes of appearance have no adverse significant effect on the main geometric attributes of appearance for non-effect coatings. Note de contenu : - EXPERIMENTAL : Preparation of scales - Instrumental measurements - Visual assessments
- RESULTS AND DISCUSSION : Intra- and inter-observer variability - Correlation between visual and instrumental differences for each geometric scale - Influence of color on geometric attributesDOI : https://doi.org/10.1007/s11998-019-00315-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00315-1.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34383
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Code-barres Cote Support Localisation Section Disponibilité 21864 - Périodique Bibliothèque principale Documentaires Disponible Effect of orange peel attribute of automotive finishes on their blackness perception / R. Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Effect of orange peel attribute of automotive finishes on their blackness perception Type de document : texte imprimé Auteurs : R. Jafari, Auteur ; Farhad Ameri, Auteur Année de publication : 2018 Article en page(s) : p. 1003-1011 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aspect peau d'orange (peinture)
Automobiles -- Revêtements:Automobiles -- Peinture
Evaluation visuelle
Noir (couleur)
Revêtements -- Finition:Peinture -- Finition
vision des couleursIndex. décimale : 667.9 Revêtements et enduits Résumé : In this paper, the perceived blackness of 10 specific automotive finishes with different levels of orange peel attribute is investigated under the diffuse illumination condition. Since the purchased ACT black panels had approximately the same colorimetric attributes, i.e., lightness, hue, and chroma, the effect of colorimetric properties on perceived blackness was minimized. Thirty nonexpert observers including 14 males and 16 females were selected to compare the blackness perception of ACT black panels. The observers’ normal color vision was already evaluated by applying the Ishihara test method. The black panels were ranked from the minimum perceived blackness to the maximum by employing the pair comparison method and performing 1800 visual assessments. Results showed that, in general, the blackness perception of panels increased with a decrease in their orange peel attributes, but the orange peel attribute is not the only factor affecting the perceived blackness of black panels. Besides, while the black panels were colorimetrically too close to each other, the panel with the lowest lightness and chroma value was assessed as the blackest sample among the ACT panels with the lowest orange peel attribute. Note de contenu : - Samples selection
- Samples measurement
- Visual assessment experimentsDOI : 10.1007/s11998-017-0046-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0046-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31124
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Effect of the type of illumination on perceived blackness of automotive finishes / R. Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)
[article]
Titre : Effect of the type of illumination on perceived blackness of automotive finishes Type de document : texte imprimé Auteurs : R. Jafari, Auteur ; Farhad Ameri, Auteur ; N. Khalili, Auteur Année de publication : 2016 Article en page(s) : p. 133-141 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Eclairage
Evaluation visuelle
Noir (couleur)
vision des couleursIndex. décimale : 667.9 Revêtements et enduits Résumé : The blackness perception of six black automotive finishes was evaluated under three different illumination conditions: unidirectional illumination, diffuse illumination and light booth condition. The metallic black panels with approximately the same appearance attributes, specular gloss, distinctness of image and orange peel, were selected to minimize the effect of total appearance factors on perceived blackness. Fourteen non-expert observers (5 males and 9 females) assessed the black panels while their normal color vision was examined by the Ishihara test. The pair comparison method was applied to rank the metallic black panels based on their perceived blackness. The results showed that under the diffuse illumination condition, a good correlation was observed between the lightness attribute of metallic black panels and their visual scales, where a decrease of the L* value leads to an increase of perceived blackness. In addition, observers assessed the darkest and the most neutral panel as the blackest sample under the three applied illumination conditions. Note de contenu : - Samples preparation
- Samples selection
- Instrumental measurements
- Visual assessment experimentsDOI : 10.1007/s11998-015-9734-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9734-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25383
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Code-barres Cote Support Localisation Section Disponibilité 17819 - Périodique Bibliothèque principale Documentaires Disponible 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]
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 deLa 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 DISCUSSIONDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31139
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible A new approach to investigate relationships between certain instrumentally measured appearance parameters and their visually perceived equivalents in the automotive industry / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)
PermalinkQuantification and prediction of visually perceived specular gloss at three illumination/viewing geometries / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)
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