TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

Evaluating the contrast of planar periodic patterns on paper

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
OtsikkoPaper Conference and Trade Show, PaperCon 2018
KustantajaTAPPI Press
Sivut294-302
Sivumäärä9
ISBN (elektroninen)9781510871892
TilaJulkaistu - 2018
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaTAPPI Paper Conference and Trade Show - Charlotte, Yhdysvallat
Kesto: 15 huhtikuuta 201818 huhtikuuta 2018

Conference

ConferenceTAPPI Paper Conference and Trade Show
MaaYhdysvallat
KaupunkiCharlotte
Ajanjakso15/04/1818/04/18

Tiivistelmä

Certain paper products contain functional or' decorative periodic patterns. Such patterns can be e.g. the 3 D structure variations in tissue paper or the decorative sfructure 'n tobacco paper. At present, the contrast of such patterns is not measured online and thus the uniformity of the end-products may vary.Trus paper Introduces two contrast estimation methods based on Fourier and histogram analysis. The performance of the estimation methods was evaluated with the reference results made by the human panel. It was noticed that both methods estimate the contrast rather reliably. However, if the wavelength of the pattern was close to the size of the image, the Fourier method was not working appropriately. The image data available in this work was collected online at the tobacco and tissue paper machines. The tobacco paper was measured with light transmittance imaging system and the tissue paper was measured with photometric stereo imaging system that estimates the 3 D surface of the paper. It was noticed that the present imaging systems can be utilized as sUch in the estimation of contrast.

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