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Estimating ink density from colour camera RGB values by the local kernel ridge regression
Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).ORCID iD: 0000-0003-2185-8973
Department of Applied Electronics, Kaunas University of Technology, Studentu 50, LT-51368 Kaunas, Lithuania.
2008 (English)In: Engineering applications of artificial intelligence, ISSN 0952-1976, E-ISSN 1873-6769, Vol. 21, no 1, p. 35-42Article in journal (Refereed) Published
Abstract [en]

We present an option for CCD colour camera based ink density measurements in newspaper printing. To solve the task, first, a reflectance spectrum is reconstructed from the CCD colour camera RGB values and then a well-known relation between ink density and the reflectance spectrum of a sample being measured is used to compute the density. To achieve an acceptable spectral reconstruction accuracy, the local kernel ridge regression is employed. The superiority of the local kernel ridge regression over the global regression and the popular ordinary polynomial regression is demonstrated by experimental comparisons. For a database consisting of 250 colour patches printed on newsprint by an ordinary offset printing press, the average spectrum reconstruction error of and the maximum error ΔEmax=3.29 was obtained. Such an error proved to be low enough for achieving the average ink density measuring error lower than 0.01D.

Place, publisher, year, edition, pages
Elsevier, 2008. Vol. 21, no 1, p. 35-42
Keywords [en]
Ink density, Reflectance spectrum, PCA, Kernel ridge regression, Colour camera
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hh:diva-1331DOI: 10.1016/j.engappai.2006.10.005ISI: 000253038200004Scopus ID: 2-s2.0-36148983475Local ID: 2082/1710OAI: oai:DiVA.org:hh-1331DiVA, id: diva2:238549
Available from: 2008-04-16 Created: 2008-04-16 Last updated: 2017-12-13Bibliographically approved

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Verikas, Antanas

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf