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19 January 2009 A study on the equivalence of controlled and uncontrolled visual experiments
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Visual experiments, if performed in a traditional way, require asking participants to go to a laboratory, where displays are calibrated and illumination conditions are set in a convenient way. In recent years there has been an increasing interest in performing the experiments "out of the lab", with the aim of reducing costs, increasing the number of participants, and differentiating the population. The equivalence of the response of visual experiments performed in controlled and uncontrolled contexts is an open question which calls for research. In this work we aim at analyzing more deeply the equivalence between "controlled" and "uncontrolled" that we found in a previous study of the authors on the comparison of visual preferences for printed images. In particular, we are interested in understanding if, and to what degree, the uncontrolled experiments require actually more participants in order to average out the effects of the many uncontrolled parameters which may affects the response. In addition we aim at exploring the relationship, if any, between our previous conclusions and the difference in the attributes of the images for which the observers were asked to express their preference.
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Silvia Zuffi, Carla Brambilla, Reiner Eschbach, and Alessandro Rizzi "A study on the equivalence of controlled and uncontrolled visual experiments", Proc. SPIE 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications, 724102 (19 January 2009);

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