Title: Objektive Bewertungsmethoden zur Ermittlung der Detailschärfe von Drucken
Language: Deutsch
Authors: Liensberger, Thomas 
Qualification level: Diploma
Keywords: Detailschärfe; Drucktechnik; Medientechnik; Fogra; Barbieri; Kreuzkorrelation; Scannerqualifizierung; CR-Target; Score
perceptual resolution; printed matter; scanner qualification
Advisor: Vincze, Markus
Issue Date: 2013
Number of Pages: 67
Qualification level: Diploma
Abstract: 
Die empfundene Bildqualität von Drucken und deren Auswertung ist momentan ein wichtiger und sehr aktiver Forschungsbereich.
Farbreproduktion, Homogenität, Detailschärfe und Artefakte werden somit nicht mehr nach ihren physikalischen Attributen bewertet, sondern subjektiv und gemäß dem menschlichen Sehsystem, unabhängig von Drucktechnologie oder Substrat. Einfach gesagt wird bewertet, was das menschliche Auge sieht.
Das in dieser Arbeit gründlich untersuchte Forschungsgebiet der empfundenen Detailschärfe wurde in den letzten Jahren relativ gut und ausführlich erforscht, jedoch existiert bis heute keine Methode diese objektiv zu bestimmen. Somit war das Ziel dieser Diplomarbeit eine computerunterstützte Bewertungsmethode zu finden, welche einem Druck einen objektiven Detailschärfewert zwischen

The evaluation of perceived image quality in prints is an active field of research. Colour and sur-face finish, homogeneity, perceptual resolution and artefacts are not anymore rated only by physical attributes, but also in a technology independent subjective manner, in the way of a human visual perception. The category of perceived perceptual resolution has been relatively well researched in recent years, but there existed no method to assess it in an objective manner. The goal of this thesis was to develop an objective computer-aided method of valuation by means of the DS-Score, which assigns values between 0 and 100 to printed matter. The evaluation method is based on a test target comprising a reasonable amount of patches, each of which containing spatial patterns (concentric circles in this case) of varying resolution and contrast. It basically works by scanning the printed Test form, simulating the human eye by using different Gauß-filters, correlating every one of these 100 fields with a perfect reference and calculating the final DS-Score as output value.
The correlation of the computer calculated DS-Score correlated very well with the visual DS-Scores of the previously done visual experiments.
With the help of this method it's possible to estimate the perceptual resolution in an objective manner with a scanner based method followed by a computer aided evaluation, and all of that without dependency from printer or substrate type.
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-47733
http://hdl.handle.net/20.500.12708/10972
Library ID: AC07815421
Organisation: E376 - Institut für Automatisierungs- und Regelungstechnik 
Publication Type: Thesis
Hochschulschrift
Appears in Collections:Thesis

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