Perception of High-Contrast Blurred Edges

Observer sensitivity to edge blur has been examined by experimental measurements of threshold blur as a function of contrast. An extension of previous results from Watt and Morgan for high-contrast blur edges is discussed and analyzed. We propose a psychophysical test based on a two-alternative forc...

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Bibliographic Details
Published in:Journal of visual communication and image representation 2001-09, Vol.12 (3), p.240-254
Main Authors: Sanz, I., Calvo, M.L., Chevalier, M., Lakshminarayanan, V.
Format: Article
Language:English
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Summary:Observer sensitivity to edge blur has been examined by experimental measurements of threshold blur as a function of contrast. An extension of previous results from Watt and Morgan for high-contrast blur edges is discussed and analyzed. We propose a psychophysical test based on a two-alternative forced choice test. The results found for three adult observers show a comparable behavior. A tendency for the blur threshold to reach an average value as contrast increases is mainly discussed. These results complement previous ones from other authors for which low- and intermediate-contrast ranges were analyzed. The observed behavior suggests a need to improve algorithms for image quality assessment, extending the actual range of contrast values to high-contrast ones.
ISSN:1047-3203
1095-9076
DOI:10.1006/jvci.2001.0473