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29 January 2007 Web-based versus controlled environment psychophysics experiments
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Proceedings Volume 6494, Image Quality and System Performance IV; 649407 (2007)
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Silvia Zuffi, Paolo Scala, Carla Brambilla, and Giordano Beretta "Web-based versus controlled environment psychophysics experiments", Proc. SPIE 6494, Image Quality and System Performance IV, 649407 (29 January 2007);


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