Henry B - Human Interface Technology Laboratory - University of ...

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1.4 Problem Previous studies suggest the FOV and resolution affect task performance in VEs. Also, the experience of self-motion depends in part on motion cues in the peripheral region of the retina. Wide FOV displays can elicit greater immersion in the VE and may enhance the experience of presence. Bullinger, Bauer & Braun (1997) recommended using a 120º horizontal by 60º vertical FOV and 9000 by 3600 pixel resolution for VE systems. On the other hand, stronger vection, which is one of the factors that may contribute to SS, is also more likely with such display. Both FOV and resolution are critical issues for VE research. Moreover, interactions between FOV and resolution need to be evaluated. As noted above, previous research indicates that postural stability is related to self-motion perception, presence and SS. This study used postural stability measures to investigate effects of different FOVs, scene resolutions and scene contents. 2. Experiment 2.1 Subjects. 10 subjects (7 women and 3 men), ages 20 to 30, were recruited from the Human Interface Technology
Laboratory subject pool. None reported a history of auditory disturbance, balance disorders, back problems, or high susceptibility to motion sickness. All subjects reported that they had normal or corrected vision. Subjects were paid $10/ hour. The protocol was approved by the University of Washington Human Subjects Review Committee. 2.2 Apparatus. The experimental setting is shown in Figure 1. Visual scene motion was generated by computer software. The scene update rate was about 60 frames / sec. Two computer-generated scenes (fountain scene – University of Washington Fountain scene and simple scene - radial pattern) with two resolutions - 600 by 600 dpi and 256 by 256 dpi were used (see Figure 2). The back-projected images from a Kodak DP1100 projector (1024 X 768 pixel resolution - Kodak, Inc.) were presented on a 3-foot dome which has a nominal 180º x 180º FOV. Subjects stood on a Chattecx balance platform (Chattecx Corp.) that automatically calculated dispersion around the center-of-balance based on signals (100 Hz sampling rate) generated by force plates under their feet. 2.3 Procedure Frontal visual scene roll oscillation was presented at a low frequency - 0.05 Hz (see Parker et al. 2001).
Page 1 and 2: Effects of Characteristics of Image
Page 3 and 4: egions of the retina, they may more
Page 5 and 6: element in perceiving self-motion.
Page 7: contribute to SS. Higher picture re
Page 11 and 12: 3. Results Because of large inter-
Page 13 and 14: 4. Discussion All the data showed t
Page 15 and 16: Scene content and resolution also a
Page 17 and 18: References 1. Alfano, P., & Michel,
Page 19 and 20: Simulation and Simulator sickness.
Page 21 and 22: Interaction, 10(2), 135-187 30. Sto
Page 23 and 24: Figure 2: Stimuli. High-resolution

Henry B - Human Interface Technology Laboratory - University of ...

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