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Issue No.01 - January/February (2010 vol.16)
pp: 17-27
Frank Steinicke , University of Münster, Münster
Gerd Bruder , University of Münster, Münster
Jason Jerald , University of North Carolina at Chapel Hill, Chapel Hill
Harald Frenz , University of Münster, Münster
Markus Lappe , University of Münster, Münster
ABSTRACT
In immersive virtual environments (IVEs), users can control their virtual viewpoint by moving their tracked head and walking through the real world. Usually, movements in the real world are mapped one-to-one to virtual camera motions. With redirection techniques, the virtual camera is manipulated by applying gains to user motion so that the virtual world moves differently than the real world. Thus, users can walk through large-scale IVEs while physically remaining in a reasonably small workspace. In psychophysical experiments with a two-alternative forced-choice task, we have quantified how much humans can unknowingly be redirected on physical paths that are different from the visually perceived paths. We tested 12 subjects in three different experiments: (E1) discrimination between virtual and physical rotations, (E2) discrimination between virtual and physical straightforward movements, and (E3) discrimination of path curvature. In experiment E1, subjects performed rotations with different gains, and then had to choose whether the visually perceived rotation was smaller or greater than the physical rotation. In experiment E2, subjects chose whether the physical walk was shorter or longer than the visually perceived scaled travel distance. In experiment E3, subjects estimate the path curvature when walking a curved path in the real world while the visual display shows a straight path in the virtual world. Our results show that users can be turned physically about 49 percent more or 20 percent less than the perceived virtual rotation, distances can be downscaled by 14 percent and upscaled by 26 percent, and users can be redirected on a circular arc with a radius greater than 22 m while they believe that they are walking straight.
INDEX TERMS
Virtual reality, virtual locomotion, redirected walking.
CITATION
Frank Steinicke, Gerd Bruder, Jason Jerald, Harald Frenz, Markus Lappe, "Estimation of Detection Thresholds for Redirected Walking Techniques", IEEE Transactions on Visualization & Computer Graphics, vol.16, no. 1, pp. 17-27, January/February 2010, doi:10.1109/TVCG.2009.62
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