Effective models for correlating spectral reflectance between spectrophotometers / Yang Xu in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 312–321 Titre : Effective models for correlating spectral reflectance between spectrophotometers Type de document : texte imprimé Auteurs : Yang Xu, Auteur ; Ming Ronnier Luo, Auteur ; Pei-Li Sun, Auteur ; Changjun Li, Auteur Année de publication : 2013 Article en page(s) : p. 312–321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Réflectance Spectrophotomètres Spectroscopie de réflectance Index. décimale : 667.3 Teinture et impression des tissus Résumé : This paper describes different models to achieve satisfactory interinstrument agreement between spectrophometers. The models investigated include the Berns and Petersen method, the modified Berns and Petersen method, the Reniff method, the Rich and Martin method and the R-model developed by Chung et al. In the paper, the Reniff method and the R-model were extended, and all the models were then evaluated using sample sets with different substrates. It was found that the extended Reniff method gave the best training performance and the worst testing performance. The Rich and Martin model, the three-term Chung model and the Berns and Petersen models, all with wavelength-dependent coefficients, gave better testing performance. DOI : 10.1111/cote.12046 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12046/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19045 [article]

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Evaluation of the CIE colour rendering index / Cheng Li in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 129-135 Titre : Evaluation of the CIE colour rendering index Type de document : texte imprimé Auteurs : Cheng Li, Auteur ; Ming Ronnier Luo, Auteur ; Guihua Cui, Auteur ; Changjun Li, Auteur Année de publication : 2011 Article en page(s) : p. 129-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Diodes électroluminescentes Sources de lumière vision des couleurs Index. décimale : 535.6 Couleur Résumé : An experiment was carried out to evaluate the change of colour appearance of samples under a reference illuminant and four light-emitting diode light sources. The results were used to evaluate the present CIE colour rendering index and other calculation methods. It was found that the present colour rendering index did not predict the visual data accurately. An index based on CAM02-UCS embedded with a reliable chromatic adaptation transform and a uniform colour space gave the best performance. Note de contenu : EXPERIMENTAL : Testing light sources - Testing samples - Viewing conditions - Data analysis RESULTS : Observer variability - The models' performances DOI : 10.1111/j.1478-4408.2011.00287.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00287.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12227 [article]

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Methods for designing characterisation targets for digital cameras / Yi-Fan Chou in COLORATION TECHNOLOGY, Vol. 129, N° 3 (06/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 3 (06/2013) . - p. 203-213 Titre : Methods for designing characterisation targets for digital cameras Type de document : texte imprimé Auteurs : Yi-Fan Chou, Auteur ; Ming Ronnier Luo, Auteur ; Changjun Li, Auteur ; Vien Cheung, Auteur ; San-Liang Lee, Auteur Année de publication : 2013 Article en page(s) : p. 203-213 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Appareils photographiques numériques Calcul Caractérisation vision des couleurs Index. décimale : 778.6 Photographie en couleur Résumé : Characterisation targets usually include a set of physical coloured samples. A characterisation model can be derived between the colorimetric values (tristimulus values) and camera responses (RGB values) taken from an imaging device such as a digital camera capturing the colours in the target. The performance of such a model is highly dependent upon the number of colours and the colour region in the characterisation target. An ideal characterisation target should provide accurate model prediction without requiring too many samples. In this paper, a computational method is presented for colour selections to train a camera characterisation model based on a fourth-order polynomial model including 35 terms. Compared with other available methods, the newly developed method performed better. It is proposed that this method be applied to generate generic targets in terms of colorimetric values. These targets should work reasonably well for a wide range of materials. Note de contenu : - CAMERA CHARACTERISATION MODEL - COLOUR SELECTIONS FOR THE TRAINING TARGET : Hardeberg method - MAXMINC method - The colour difference iteration (CDI) method - DATA COLLECTION : Munsell book of color - Professional colour communicator - GretagMacbeth ColorChecker DC - Nikon D80 digital camera - GretagMacbeth COLOR-EYE 7000A spectrophotometer - COMPARISON OF COLOUR SELECTION METHODS - COLOUR SELECTION GUIDELINE FOR CHARACTERISING DIGITAL CAMERAS - DEVELOPMENT OF GENERIC CHARACTERISATION TARGETS BASED ON COLORIMETRIC VALUES : Approach 1 : averaged CDI - Approach 2 : grid CDI DOI : 10.1111/cote.12022 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12022/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18494 [article]

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Revisiting the weighting function for lightness in the CIEDE2000 colour-difference formula / Manuel Melgosa in COLORATION TECHNOLOGY, Vol. 133, N° 4 (08/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 4 (08/2017) . - p. 274-282 Titre : Revisiting the weighting function for lightness in the CIEDE2000 colour-difference formula Type de document : texte imprimé Auteurs : Manuel Melgosa, Auteur ; Guihua Cui, Auteur ; Claudio Oleari, Auteur ; Pedro J. Pardo, Auteur ; Min Huang, Auteur ; Changjun Li, Auteur ; Ming Ronnier Luo, Auteur Année de publication : 2017 Article en page(s) : p. 274-282 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Fonction de pondération Index. décimale : 535.6 Couleur Résumé : We have used 13 experimental datasets (7420 colour pairs) to study the performance of the weighting function for lightness proposed by the CIEDE2000 colour-difference formula, because it has been suggested that this function can be improved by using the weighting function for lightness SL = 1 adopted by the CIE94 colour-difference formula. Using the standardised residual sum of squares (STRESS) index, it was found that: (i) replacing the SL in CIEDE2000 with SL = 1 improved the results for 7/13 datasets considered, but the improvement was statistically significant only for 1/13 datasets; (ii) a Whittle-type lightness-difference formula can be used to replace the term ?L*/SL in CIEDE2000, which led to a new colour-difference formula with no statistically significant difference with respect to CIEDE2000 for any of the 13 experimental datasets. A modification of the CIEDE2000 formula using a Whittle-type lightness formula is proposed. Note de contenu : - Influence of the four constants in the Sl function of CIEDE2000 - Replacement of ?L*/SL by a new lightness function based on the whittle formula - STRESS results using CIEDE2000 and two CIEDE2000-modified formulas DOI : 10.1111/cote.12294 En ligne : https://drive.google.com/file/d/1mNNKRQVoKWPADqH4d1JgEsji7TJE6dy2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28879 [article]

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