Biting fly damage on bovine leather - An alternative source of 'light spot' damage / P. J Stosic in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 4 (07-08/2000)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 4 (07-08/2000) . - p. 159-164 Titre : Biting fly damage on bovine leather - An alternative source of 'light spot' damage Type de document : texte imprimé Auteurs : P. J Stosic, Auteur ; P. J. Hadley, Auteur ; G. C. Coles, Auteur ; D. Shearer, Auteur ; P. C. Garnsworthy, Auteur Année de publication : 2000 Article en page(s) : p. 159-164 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Défauts Cuirs et peaux de bovins Mouches Taches (défauts) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the grading processes of leather, one of the most common downgrading defects is ‘light spot’. Small scale trial work has established that a form of ‘light spot’ was produced on bovine crust leather after the live animal had been exposed to biting flies (specifically Stomoxj’s calcitrans). The resultant damage was found to have sharper boundary edges, compared with the diffuse edges associated with lice ‘light spot’ damage. The ‘light spots’ were grouped closely together and were of a more consistent, regular size and shape than either lice or demodex damage. The fly damage penetrated into the corium layer of the skin, beyond the superficial grain enamel loss associated with lice damage. Note de contenu : - Light spot damage : Biting flies - Economic losses associated with biting flies - Outline of trial : Pathology results - Leather damage results - Table 1 : Examples of different ‘light spot’ damage faults on leather and the causal agents En ligne : https://drive.google.com/file/d/1z19d235x_v9h_ArQ2V7zlZeyaM3RZOLC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40999 [article]

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Comparative study of different methods for the assessment of print nonuniformity and their correlation with the human visual system / Ivana Juric in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 239-251 Titre : Comparative study of different methods for the assessment of print nonuniformity and their correlation with the human visual system Type de document : texte imprimé Auteurs : Ivana Juric, Auteur ; Suncica Zdravkovic, Auteur ; Nemanja Kasikovic, Auteur ; Sandra Dedijer, Auteur ; Magdolna Pal, Auteur ; Zivko Pavlovic, Auteur ; Igor Karlovits, Auteur Année de publication : 2024 Article en page(s) : p. 239-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Détection de défauts (Ingénierie) Etudes comparatives Evaluation Evaluation visuelle Impression numérique Marbrures (défauts) Taches (défauts) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Print non-uniformity is the variation of optical density (reflection) on the print and can occur in several different types that can be classified into two basic groups: random and systematic variations. This article examines two types from each group of variations that are most commonly found in digital printing systems: blotches and streaks, where amplitude and size were varied. Three most commonly used methods for measuring the print nonuniformity were used: Grey Level Co-occurrence Matrix (GLCM), ISO 13660 and Integration (also Improved Integration) method. The results obtained by measuring were compared with a visual assessment to find the link between objective and subjective analysis and to define and determine which method/parameter is the best for the measurement of which type of print (non)uniformity. The obtained results indicate the possibility of selecting the measurement parameter, but that the choice of the parameter depends on the type of nonuniformity. It is concluded that in the case of the GLCM method, the entropy and energy parameters are strongly related to the visual assessment for all three sets of samples. These parameters can be used regardless of the type of nonuniformity. The ISO G parameter can be used to measure both graininess and mottling, while the ISO M parameter is only suitable for measuring mottling. Integration method could be used to measure systematic error. On the basis of conclusions of the research, it is possible to propose the development of an industrially applicable solution for measuring print nonuniformity of digitally printed samples. Note de contenu : - INTRODUCTION : Methods for quantification and analysis of print nonuniformity - Field size for the analysis of print nonuniformity - MATERIALS AND METHODS : Sample creation - Image acquisition - Objective methods - Visual assessment - RESULTS AND DISCUSSION : Correlation between objective methods and visual assessment DOI : https://doi.org/10.1111/cote.12708 En ligne : https://drive.google.com/file/d/1u6Yhltf8474GtNOGVhD_aJL_WHtIhLry/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40940 [article]

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