Issue No.07 - July (2012 vol.18)
M. Lappe , Inst. of Psychol., Univ. of Munster, Munster, Germany
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TVCG.2011.274
Motion perception in immersive virtual environments significantly differs from the real world. For example, previous work has shown that users tend to underestimate travel distances in virtual environments (VEs). As a solution to this problem, researchers proposed to scale the mapped virtual camera motion relative to the tracked real-world movement of a user until real and virtual motion are perceived as equal, i.e., real-world movements could be mapped with a larger gain to the VE in order to compensate for the underestimation. However, introducing discrepancies between real and virtual motion can become a problem, in particular, due to misalignments of both worlds and distorted space cognition. In this paper, we describe a different approach that introduces apparent self-motion illusions by manipulating optic flow fields during movements in VEs. These manipulations can affect self-motion perception in VEs, but omit a quantitative discrepancy between real and virtual motions. In particular, we consider to which regions of the virtual view these apparent self-motion illusions can be applied, i.e., the ground plane or peripheral vision. Therefore, we introduce four illusions and show in experiments that optic flow manipulation can significantly affect users' self-motion judgments. Furthermore, we show that with such manipulations of optic flow fields the underestimation of travel distances can be compensated.
visual perception, image sensors, image sequences, motion estimation, virtual reality, peripheral vision, self-motion perception tuning, virtual reality, visual illusions, virtual environments, travel distance underestimation, mapped virtual camera motion, underestimation compensation, distorted space cognition, self-motion illusions, optic flow fields, ground plane vision, Visualization, Optical sensors, Cameras, Optical distortion, Blindness, Stimulated emission, Detectors, optic flow., Self-motion perception, virtual environments, visual illusions
M. Lappe, "Tuning Self-Motion Perception in Virtual Reality with Visual Illusions", IEEE Transactions on Visualization & Computer Graphics, vol.18, no. 7, pp. 1068-1078, July 2012, doi:10.1109/TVCG.2011.274