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3 May 2000 Supporting natural prehension in virtual environments
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Depth and distance judgements were compared under monocular, motion parallax and binocular viewing conditions using a telepresence system. Participants viewed the virtual objects via a modified Wheatstone stereoscope. A camera pair relayed images of real objects to the LCD displays within the stereoscope. The entire viewing apparatus was mounted on a linear stage thus allowing parallax movement to be driven by lateral head motion of the observer. In the monocular and motion parallax conditions, the same image was presented to both eyes and convergence was set to approximately mid- target distance. In the binocular condition, the cameras and displays were configured to preserve the appropriate convergence and disparity information. The participants' task was to reach and 'grasp' the object seen within the stereoscope. Reach distance and grasp aperture were recorded via a magnetic tracking device. Judgements were most accurate when stereo information was available. Surprisingly, motion parallax information did not seem to improve performance over that observed in the monocular condition.
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Annaliese M. Plooy and John P. Wann "Supporting natural prehension in virtual environments", Proc. SPIE 3957, Stereoscopic Displays and Virtual Reality Systems VII, (3 May 2000);

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