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Proceedings Paper

Web-based versus controlled environment psychophysics experiments
Author(s): Silvia Zuffi; Paolo Scala; Carla Brambilla; Giordano Beretta
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Paper Abstract

A recent trend in psychophysics experiments related to image quality is to perform the experiments on the World Wide Web with a large number of observers instead of in a laboratory under controlled conditions. This method assumes that the large number of participants involved in a Web investigation "averages out" the parameters that the experiments would require to keep fixed in the same experiment performed, following a traditional approach, under controlled conditions. In this paper we present the results of two experiments we have conducted to assess the minimum value of color contrast to ensure readability. The first experiment was performed in a controlled environment, the second on the Web. The result emerging from the statistical data analysis is that the Web experiment yields the same conclusions as the experiment done in the laboratory.

Paper Details

Date Published: 29 January 2007
PDF: 8 pages
Proc. SPIE 6494, Image Quality and System Performance IV, 649407 (29 January 2007); doi: 10.1117/12.703926
Show Author Affiliations
Silvia Zuffi, ITC, CNR (Italy)
Paolo Scala, ITC, CNR (Italy)
Carla Brambilla, IMATI, CNR (Italy)
Giordano Beretta, Hewlett-Packard Labs. (United States)

Published in SPIE Proceedings Vol. 6494:
Image Quality and System Performance IV
Luke C. Cui; Yoichi Miyake, Editor(s)

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