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Green Image
Issue No. 04 - April (2012 vol. 18)
ISSN: 1077-2626
pp: 581-588
B. Pollock , Comput. Eng. Dept., Iowa State Univ., Ames, IA, USA
M. Burton , Human Comput. Interaction Program & Virtual Reality Applic. Center, Iowa State Univ., Ames, IA, USA
J. W. Kelly , Dept. of Psychol., Iowa State Univ., Ames, IA, USA
S. Gilbert , Human Comput. Interaction Program & Virtual Reality Applic. Center, Iowa State Univ., Ames, IA, USA
E. Winer , Mech. Eng. Dept., Iowa State Univ., Ames, IA, USA
Stereoscopic depth cues improve depth perception and increase immersion within virtual environments (VEs). However, improper display of these cues can distort perceived distances and directions. Consider a multi-user VE, where all users view identical stereoscopic images regardless of physical location. In this scenario, cues are typically customized for one "leader" equipped with a head-tracking device. This user stands at the center of projection (CoP) and all other users ("followers") view the scene from other locations and receive improper depth cues. This paper examines perceived depth distortion when viewing stereoscopic VEs from follower perspectives and the impact of these distortions on collaborative spatial judgments. Pairs of participants made collaborative depth judgments of virtual shapes viewed from the CoP or after displacement forward or backward. Forward and backward displacement caused perceived depth compression and expansion, respectively, with greater compression than expansion. Furthermore, distortion was less than predicted by a ray-intersection model of stereo geometry. Collaboration times were significantly longer when participants stood at different locations compared to the same location, and increased with greater perceived depth discrepancy between the two viewing locations. These findings advance our understanding of spatial distortions in multi-user VEs, and suggest a strategy for reducing distortion.
virtual reality, computer displays, stereo image processing, user interfaces, stereoscopic displays, depth perception, stereoscopic multiuser virtual environment, stereoscopic depth cue, immersion, stereoscopic image, head-tracking device, center-of-projection, follower perspective, leader perspective, collaborative spatial judgment, virtual shape, forward displacement, backward displacement, perceived depth compression, perceived depth expansion, ray-intersection model, stereo geometry, distortion reduction strategy, Virtual environments, Predictive models, Stereo image processing, Shape, Collaboration, Educational institutions, and collaborative interaction., Perception, stereoscopy

M. Burton, B. Pollock, J. W. Kelly, S. Gilbert and E. Winer, "The Right View from the Wrong Location: Depth Perception in Stereoscopic Multi-User Virtual Environments," in IEEE Transactions on Visualization & Computer Graphics, vol. 18, no. , pp. 581-588, 2012.
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