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Evaluating the contrast of planar periodic patterns on paper

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Details

Original languageEnglish
Title of host publicationPaper Conference and Trade Show, PaperCon 2018
PublisherTAPPI Press
Pages294-302
Number of pages9
ISBN (Electronic)9781510871892
Publication statusPublished - 2018
Publication typeA4 Article in a conference publication
EventTAPPI Paper Conference and Trade Show - Charlotte, United States
Duration: 15 Apr 201818 Apr 2018

Conference

ConferenceTAPPI Paper Conference and Trade Show
CountryUnited States
CityCharlotte
Period15/04/1818/04/18

Abstract

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.

Publication forum classification

Field of science, Statistics Finland