Eliminating material dependency in spectra measurement via non-neighbouring band regression / Hui-Liang Shen in COLORATION TECHNOLOGY, Vol. 132, N° 2 (04/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 2 (04/2016) . - p. 186-192 Titre : Eliminating material dependency in spectra measurement via non-neighbouring band regression Type de document : texte imprimé Auteurs : Hui-Liang Shen, Auteur ; Quan-Geng Ge, Auteur ; Zhi-Huan Zheng, Auteur ; Xin Du, Auteur ; Si-Jie Shao, Auteur ; John H. Xin, Auteur Année de publication : 2016 Article en page(s) : p. 186-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Couleur -- Analyse Imagerie (technique) Réflectance Index. décimale : 667.3 Teinture et impression des tissus Résumé : A multispectral imaging system, after necessary calibration, can measure the spectral reflectances of colour samples accurately at a high spatial resolution. A limitation is that agreement of its measurements with those of a reference spectrophotometer is affected by the reflective characteristics of sample materials. The state-of-the-art methods aim to improve interinstrument agreement using the spectral values of neighbouring bands. However, it is observed that non-neighbouring bands are more effective in modelling interinstrument agreement. Inspired by this observation, the present paper proposes a method for eliminating material dependency by least-squares regression among non-neighbouring spectral bands. The fundamental issue of band selection is solved using a binary differential evolution algorithm. Experimental results confirm that the proposed method is effective in reflectance correction in terms of both spectral and colorimetric accuracy. The method is of practical application to multispectral imaging systems when measuring the spectral reflectances of colour samples with different materials. DOI : 10.1111/cote.12207 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12207 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25869 [article]

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Fluorescent whiteness measurement of textiles by multispectral imaging system / Pengpeng Yao in COLORATION TECHNOLOGY, Vol. 140, N° 4 (08/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 4 (08/2024) . - p. 612-619 Titre : Fluorescent whiteness measurement of textiles by multispectral imaging system Type de document : texte imprimé Auteurs : Pengpeng Yao, Auteur ; Ho Chung Wu, Auteur ; Yixuan Li, Auteur ; Jingyi Xu, Auteur ; John H. Xin, Auteur Année de publication : 2024 Article en page(s) : p. 612-619 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Blancheur Colorimétrie Imagerie (technique) Spectroscopie de réflectance Textiles et tissus -- Analyse Index. décimale : 667.3 Teinture et impression des tissus Résumé : Accurate whiteness measurement is critical across various industries including textiles, paper, and detergents. With the advent of fluorescent whitening agents (FWAs), the assessment of whiteness has evolved from simply measuring reflectance to determining the spectral radiance factor (SRF) of materials. While multispectral imaging (MSI) can effectively measure object reflectance and colour, its accuracy is compromised by FWAs that significantly augment spectral reflectance. Thus, reliable whiteness measurement requires the determination of both reflectance and SRF. This article presents the design of a specialised light source equipped with an ultraviolet (UV) filter to provide adjustable illumination within an integrating sphere system. By tuning the position of the UV filter, multispectral images are captured of a fabric under varying UV exposures. These images are subsequently processed and combined to reconstruct full-range visible spectrum information. This approach is shown to achieve high accuracy and spatial uniformity in quantifying the whiteness of textiles using MSI. Note de contenu : - FORMULATION OF MSI WHITENESS MEASUREMENT : Fluorescent image capturing - Light balance - Spatial uniformity for pure reflective material - Spatial uniformity for materials with FWAs - CIE colour equation - Whiteness formula - WHITENESS CALIBRATION METHOD : One-point-matching method - Numerical method - DEVICE SETUP - EXPERIMENTAL DETAILS AND RESULTS : Dataset - One-point-matching method and numerical method - Spatial uniformity - Results and analysis DOI : https://doi.org/10.1111/cote.12721 En ligne : https://drive.google.com/file/d/1KjYfaSIIgH7AJILMvWm40htkqJsyA2xW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41321 [article]

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