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Investigating Incoherent Depth Perception Features in Virtual Reality using Stereoscopic Impostor-Based Rendering
Abstract
Depth perception is essential for our daily experiences, aiding in orientation and interaction with our surroundings. Virtual Reality allows us to decouple such depth cues mainly represented through binocular disparity and motion parallax. Dealing with fully-mesh-based rendering methods these cues are not problematic as they originate from the object's underlying geometry. However, manipulating motion parallax, as seen in stereoscopic imposter-based rendering, raises multiple perceptual questions. Therefore, we conducted a user experiment to investigate how varying object sizes affect such visual errors and perceived 3-dimensionality, revealing an interestingly significant negative correlation and new assumptions about visual quality.
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The present study investigates the subjective feeling of presence elicited by 3DTV and its relationship to perceived depth and image content. Subjective methods of assessing presence that have been used or proposed to date do not provide a measure of temporal variation. To overcome this limitation, we have applied the continuous assessment methodology (ITU-R, BT 500-7) to the assessment of presence, perceived depth and naturalness of depth. Twelve observers continuously rated their instantaneous perception of presence, depth and naturalness of depth when viewing stereoscopic footage. The results indicate that subjective presence ratings are subject to considerable temporal variation depending on the image content and camera techniques used. The correlations between the different attributes suggest that an increase in depth may lead to an enhanced sense of presence, provided depth is perceived as natural. A qualitative analysis of the data in relation to the image content provides evidence for the hypothesis that the extent of sensory information available to an observer is a determinant of presence, as proposed by T.B. Sheridan, Musings on telepresence and virtual presence, Presence: Teleoperators and Virtual Environments 1 (1992) 120-125. (C) 1998 Elsevier Science B.V.
The reported phenomena were obtained through the use of special techniques. (i) All monocular depth and familiarity cues were removed from the stimuli (through the use of randomdot stereo patterns). (ii) The statistical and topological properties of the stimuli were precisely known (since they were generated according to a specific computer program). (iii) Convergence motions of the eye and proprioceptive cues were eliminated (through the use of tachistoscopic illumination). (iv) The time of presentation was under control (through erasure of the persistent afterimages). Under these conditions stereopsis could be studied in its purest form. It was shown that depth can be perceived in the absence of monocular depth and familiarity cues and of all binocular depth cues except for disparity. These findings have important implications for some existing theories of stereopsis and open up areas for further research. Some phenomena based on stereo erasure are reported here for the first time. It has been demonstrated that the perception of ambiguous depth organizations can be influenced, even subliminally, by a preceding unambiguous stimulus. Perhaps the most interesting result is the finding that the correspondence of objects and patterns in the two retinal projections can be established without actual recognition of the objects and patterns. This pattern matching is based on some relatively simple processes of finding connected clusters formed by adjacent points of similar brightness, and the processes seem to be amenable to rigorous analysis.
Investigating the effect of embodied visualization in remote collaborative augmented reality
- K Waldow
- A Fuhrmann
- S M Grünvogel
K. Waldow, A. Fuhrmann, and S. M. Grünvogel. Investigating the effect
of embodied visualization in remote collaborative augmented reality. In
International Conference on Virtual Reality and Augmented Reality, pp.
246-262. Springer, 2019.