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23 May 2002 Viewing stereoscopic images comfortably: the effects of whole-field vertical disparity
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Abstract
Stereoscopic images while providing enhanced depth and image quality can cause moderate discomfort. In this paper, we present the results of two experiments aimed at investigating one possible source of discomfort: whole-field vertical disparities. In both experiments, we asked viewers to rate their comfort level while viewing a 3D feature film in which the left and right images were vertically misaligned. The feature film was presented on a large theater type screen. In Experiment 1, the vertical offset was changed randomly on a scene-by-scene basis resulting in an average vertical disparity of 31 minutes or arc at the closest viewing distance. The results showed that whole- field vertical disparities produced a marginal increase in discomfort that became only slightly more pronounced with time. In Experiment 2, we alternated periods of low, medium and high levels of whole-field vertical disparity. At the closest distance, the mean vertical disparity was 15, 30, or 62 minutes of arc for the low, medium and high disparity conditions, respectively. In this experiment, discomfort increased with vertical disparity, but again only marginally even after prolonged exposure. We conclude that whole-field vertical disparities cannot be a major contributor to the discomfort experienced by observers when viewing stereoscopic images.
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Filippo Speranza and Laurie M. Wilcox "Viewing stereoscopic images comfortably: the effects of whole-field vertical disparity", Proc. SPIE 4660, Stereoscopic Displays and Virtual Reality Systems IX, (23 May 2002); https://doi.org/10.1117/12.468047
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