Artificial neural networks for optimising camera-based colour measurements of prints enhanced with pearlescent pigments / Ivana Tomic in COLORATION TECHNOLOGY, Vol. 134, N° 5 (10/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 5 (10/2018) . - p. 364-372 Titre : Artificial neural networks for optimising camera-based colour measurements of prints enhanced with pearlescent pigments Type de document : texte imprimé Auteurs : Ivana Tomic, Auteur ; Sandra Dedijer, Auteur ; Dragoljub Novakovic ; Ivana Juric Année de publication : 2018 Article en page(s) : p. 364-372 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Photographie numérique Pigments nacrés Réseaux neuronaux (informatique) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Pearlescent pigments are widely used in printing due to their optical, chemical and physical properties. To analyse the effects of goniochromism they produce, the colorimetric characterisation of materials printed with pearlescent pigments requires multi-angular measurements. In this study, the colours of prints enhanced with pearlescent pigments were measured by means of a digital camera, relying on the empirical camera characterisation method. Since this method is time-consuming, it was altered to enable estimates of colorimetric values for different geometries to be measured on the basis of images captured at one viewing angle. This approach was based on the use of artificial neural networks which were shown to provide sufficient flexibility for the given task. The results indicate that the images obtained at the viewing angle of 45° aspecular (measuring geometry 45°/asp 45°) accurately estimate CIELab values for all of the tested measuring geometries. The proposed method is therefore not only time-efficient but also reduces the associated errors due to the camera's movement, and enables the estimation of colorimetric values for those viewing angles inaccessible by camera. DOI : 10.1111/cote.12346 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12346 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31161 [article]

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Digital image capture - Filmless camera technology and techniques / Algy Kazlauciunas in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B3 (09/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B3 (09/2006) . - p. 193-199 Titre : Digital image capture - Filmless camera technology and techniques Type de document : texte imprimé Auteurs : Algy Kazlauciunas, Auteur Année de publication : 2006 Article en page(s) : p. 193-199 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Imagerie numérique Photographie numérique Tags : 'Dispositif  semi-conducteur  à  couplage  de  charge'  'Oxyde  métal  complémentaire'  'Capteur  photo'  'Convertisseur  analogique-numérique'  'Frange  moirée'  Photodiode Index. décimale : 667.9 Revêtements et enduits Résumé : The digital imaging revolution continues apace, affecting the whole spectrum of the photographic industry. In many part of the world digital cameras now outsell conventional film cameras, and many of the disadvantages associated with digital image capture in the very recent past1.2 have been nulified. As the digital industry grows, the various technologies involved continue to be ever innovative. With respect to digital cameras, the image sensor performance criteria have improved immeasurably since the launch of the first solid-state camera in the early 1980s. The charge-coupled semiconductor device (CCD), for so long the unrivalled image-capture component in digital cameras, is now being challenged by complementary metal oxide semiconductor (CMOS) technology and the innovatively re-designed Fujifilm Super CCD. In addition, the recent introduction of the Foveon full-colour imaging sensor has added a new dimension to digital image capture. This paper reviews current image-capture sensors and the way that the various digital imaging camera designs are able to record and reproduce colour images. Note de contenu : - Sensor technology : Charge-coupled semiconductor (CCE) - Complementary metal oxide semiconductor (CMOS) - Fujifilm super CCD - Foevon X3 CMOS full-colour imaging sensor - Digital camera classification/colour capture and reproduction methodology - One-shot single matrix - Three-shot single matrix - One-shot triple matrix - Scanning trilinear array - Multi-shot single matrix (with whole-element shift) - Multi-shot single matrix (with sub-element shift) DOI : 10.1007/BF02699660 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699660.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5277 [article]

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Digital photography for cosmetic efficacy studies / Fabrice Perin in PERSONAL CARE EUROPE, Vol. 7, N° 3 (04/2014)  

[article]  inPERSONAL CARE EUROPE > Vol. 7, N° 3 (04/2014) . - p. 77-79 Titre : Digital photography for cosmetic efficacy studies Type de document : texte imprimé Auteurs : Fabrice Perin, Auteur Année de publication : 2014 Article en page(s) : p. 77-79 Langues : Anglais (eng) Catégories : Dermo-cosmétologie Etudes cliniques Photographie numérique Index. décimale : 668.5 Parfums et cosmétiques Résumé : 'One picture is worth more than a thousand words' is a popular saying which appeared in the 20th century, resembling an earlier quote from the Russian writer Ivan Turgenev in his book Fathers and Sons: "A picture shows me at a glance what it takes dozens of pages of a book to expound." Since the skin is the only human organ fully accessible to visual examination, it explains why photography has become so widely used in dermatology firstly, and then in cosmetology. In the past ten years, all the domains of digital imaging technology have considerably improved : photograph acquisition, image processing, easiness of storage, teleconsultations. Photography is of utmost importance to cosmetology because it allows looking at visible changes of skin characteristics. Despite the fact that digital cameras are owned by an incredibly large number of people, some important photographic principles are relatively poorly understood by many when it comes to professional utilisation of images. Because digital pictures can easily be manipulated, it is therefore essential for the public to know the basics of photographic methods used to demonstrate and support cosmetic claims, and for professionais to grasp that photographic tests must be carried out in the same way as scientific measurements. As a consequence, traceability, reproducibility, repeatability, and calibration are concepts which also totally apply to photographic methods. The knowledge of the key factors influencing the quality of one picture and the validity of its analysis should allow the development of critical thinking when looking at photographs acquired during clinical studies or at quantitative/qualitative information extracted from them. Note de contenu : - Focus on lighting - Understanding camera settings - positioning En ligne : https://drive.google.com/file/d/1BE96za3ogwjt6lS9656ROO_oU2WDzm2E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21114 [article]

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Photorealistic ink-jet digital printing – factors influencing image quality, image stability and print durability / Algy Kazlauciunas in COLORATION TECHNOLOGY, Vol. 126, N° 6 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 6 (2010) . - p. 315-324 Titre : Photorealistic ink-jet digital printing – factors influencing image quality, image stability and print durability Type de document : texte imprimé Auteurs : Algy Kazlauciunas, Auteur Année de publication : 2010 Article en page(s) : p. 315-324 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Impression en couleur Impression numérique -- Stabilité Photographie numérique Index. décimale : 686.232 Procédés photomécaniques Résumé : Digital cameras have now replaced film-based cameras as the most popular method of still image capture. As a consequence, there has been a rise in growth of the photo-realistic digital-printer market as many amateur and professional photographers choose to produce their own hard copy images. The most popular digital printing technology for producing photo-realistic images is currently drop-on-demand ink jet. There has been much research into key factors influencing the quality, stability and durability of images produced using this, and other, digital printing technologies. A key area of study in achieving photo-realistic images from digital printing systems has been ink-receivable layers and dye/pigment colorants, and most importantly compatibility between the two. As with any new technology it is important to achieve an acceptable standard of performance and, to this end, research work has been instigated by the International Standards Institute since the mid-1990s, to achieve a set of standards appertaining to areas such as light fastness, water fastness, thermal stability, humidity fastness and pollution susceptibility. This paper reviews the current state regarding the aforementioned areas with respect to their influence on print quality, stability and durability. DOI : 10.1111/j.1478-4408.2010.00271.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00271.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10241 [article]

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