15 May 1997 Task-dependent use of binocular disparity and motion parallax information within telepresence and quasi-natural environments
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The effect of different depth cues presented through a head mounted display (HMD) in a dark (no pictorial cue) environment was investigated. In four experiments the relative effects of binocular disparity, motion parallax, and a combination of the two, were assessed for four tasks at two viewing distances. These tasks (which varied in the minimum amount of information they required) were a nulling task (based on the Howard-Dolman stereo test), setting a triangle to be equilateral, matching two triangles at different depths and estimating absolute distance. Performance within the tasks varied considerably with the nulling task best. Performance in the other tasks indicates a difference at different viewing conditions which may be due to a failure in the assessment of absolute viewing distance. Although results from the final task indicate that observers can use this information under certain circumstances. It is argued that these results are task specific and may reflect limitations in the viewing equipment. Although there was some variation between different cue types they appear to be largely interchangeable within the tasks. This questions whether there is always a need to present both disparity and motion cues in telepresence systems.
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Andrew D. Parton, Andrew D. Parton, Mark F. Bradshaw, Mark F. Bradshaw, John R. G. Pretlove, John R. G. Pretlove, Bart De Bruyn, Bart De Bruyn, Ian R. L. Davies, Ian R. L. Davies, } "Task-dependent use of binocular disparity and motion parallax information within telepresence and quasi-natural environments", Proc. SPIE 3012, Stereoscopic Displays and Virtual Reality Systems IV, (15 May 1997); doi: 10.1117/12.274473; https://doi.org/10.1117/12.274473

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