Evaluation of perceptual resolution of printed matter (Fogra L-Score evaluation)

Thomas Liensberger; Andreas Kraushaar

doi:10.1117/12.2037262

3 February 2014 Evaluation of perceptual resolution of printed matter (Fogra L-Score evaluation)

Thomas Liensberger, Andreas Kraushaar

Proceedings Volume 9016, Image Quality and System Performance XI; 901606 (2014) https://doi.org/10.1117/12.2037262
Event: IS&T/SPIE Electronic Imaging, 2014, San Francisco, California, United States

Abstract

A new method has been developed to address the objective evaluation of perceived resolution of printed matter. To achieve this, a psychophysical experiment has been designed and conducted that ranked typical test prints representing the manifold of printing processes and substrates. A scanner based method has been developed that computes a score value between 0 and 100 termed Fogra L-Score. It is based on the idea to identify a predefined signal in an image (print). The predefined signal is a perfect representation of the “perceived resolution domain” by means of a test target (RIT ConRes-target) that covers systematic variations of the two governing parameters of perceived resolution namely contrast and spatial resolution. The printed images to be evaluated have been scanned and pre-processed. The level of closeness between the reference (digital representation) and the printed matter (scanned print) have been determined by a 2-dimensional normalized cross-correlation (on the CIEL*-channel). The resulting correlation coefficients have been compared against findings of the performed psychophysical experiment. Finally a framework will be presented that also allows for spatial filtering to address different intended viewing distances as well as chromatic test charts. Publisher’s Note: The first printing of this volume was completed prior to the SPIE Digital Library publication and this paper has since been replaced with a corrected/revised version.

Citation Download Citation

Thomas Liensberger and Andreas Kraushaar "Evaluation of perceptual resolution of printed matter (Fogra L-Score evaluation)", Proc. SPIE 9016, Image Quality and System Performance XI, 901606 (3 February 2014); https://doi.org/10.1117/12.2037262

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available