Abstract
In the realm of wearable augmented reality (AR) systems, stereoscopic video see-through displays raise issues related to the user’s perception of the three-dimensional space. This paper seeks to put forward few considerations regarding the perceptual artefacts common to standard stereoscopic video see-through displays with fixed camera convergence. Among the possible perceptual artefacts, the most significant one relates to diplopia arising from reduced stereo overlaps and too large screen disparities. Two state-of-the-art solutions are reviewed. The first one suggests a dynamic change, via software, of the virtual camera convergence, whereas the second one suggests a matched hardware/software solution based on a series of predefined focus/vergence configurations. Potentialities and limits of both the solutions are outlined so as to provide the AR community, a yardstick for developing new stereoscopic video see-through systems suitable for different working distances.
Highlights
Human eyes are placed frontally about 6-7 cm apart so they both perceive the same scene but from slightly different viewpoints
In stereoscopic video see-through head-mounted displays (HMDs), double vision for the user may arise if the fixation point, determined by the intersection of the optical axis of the stereo camera pair, leads to reduced stereo overlap between the two images delivered to the eyes through the HMD
The use of stereoscopic video see-through HMDs in case of augmented reality (AR) assistance during manually performed tasks in which the user is asked to interact with the scene at close working distances, and during procedures demanding for high hand-eye coordination, is heavily hindered by the occurrence of diplopia
Summary
Within a special visual space around the fixation point (except the points belonging to the horopter), the corresponding points on the retina produce disparities whose values are processed by the visual cortex of the brain to estimate depth relations in such area around the fixation point (Fig. 2). These disparities, provided they are sufficiently small, can be either positive, if the points under observation are behind the horopter, or negative if the points are in front of the horopter. Outside the Panum’s area, the objects are perceived as diplopic ( cannot be fused with )
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