Stereoscopic distortions when viewing geometry does not match inter-pupillary distance. Tong, J., Allison, R. S., & Wilcox, L. M. In Journal of Vision (VSS Abstracts), volume 22, pages 3564. 2022. ![Stereoscopic distortions when viewing geometry does not match inter-pupillary distance [link]](https://bibbase.org/img/filetypes/link.svg "link")
-1 doi abstract bibtex The relationship between depth and binocular cues (disparity and convergence) is defined by the distance separating the two eyes, also known as the inter-pupillary distance (IPD). This relationship is mapped in the visual system through experience and feedback, and adaptively recalibrated as IPD gradually increases during development. However, with the advent of stereoscopic-3D displays, situations may arise in which the visual system views content that is captured or rendered with a camera separation that differs from the viewer's own IPD; without feedback, this will likely result in a systematic and persistent misperception of depth. We tested this prediction using a VR headset in which the inter-axial separation of virtual cameras and the separation between the optics are coupled. Observers (n=15) were asked to adjust the angle between two intersecting textured-surfaces until it appeared to be 90$\,^{∘}$, at each of three viewing distances. In the baseline condition the lens and camera separations matched each observer's IPD. In two `mismatch' conditions (tested in separate blocks) the lens and camera separations were set to the maximum (71 mm) and minimum (59 mm) allowed by the headset. We found that when the lens and camera separation were less than the viewer's IPD they exhibited compression of space; the adjusted angle was smaller than their baseline setting. The reverse pattern was seen when the lens and camera separation were larger than the viewer's IPD. Linear regression analysis supported these conclusions with a significant correlation between the magnitude of IPD mismatch and the deviation of angle adjustment relative to the baseline condition. We show that these results are well explained by a geometric model that considers the scaling of disparity and convergence due to shifts in virtual camera and optical inter-axial separations relative to an observer's IPD.
@incollection{Tong:2022ca,
abstract = {The relationship between depth and binocular cues (disparity and convergence) is defined by the distance separating the two eyes, also known as the inter-pupillary distance (IPD). This relationship is mapped in the visual system through experience and feedback, and adaptively recalibrated as IPD gradually increases during development. However, with the advent of stereoscopic-3D displays, situations may arise in which the visual system views content that is captured or rendered with a camera separation that differs from the viewer's own IPD; without feedback, this will likely result in a systematic and persistent misperception of depth. We tested this prediction using a VR headset in which the inter-axial separation of virtual cameras and the separation between the optics are coupled. Observers (n=15) were asked to adjust the angle between two intersecting textured-surfaces until it appeared to be 90$\,^{\circ}$, at each of three viewing distances. In the baseline condition the lens and camera separations matched each observer's IPD. In two `mismatch' conditions (tested in separate blocks) the lens and camera separations were set to the maximum (71 mm) and minimum (59 mm) allowed by the headset. We found that when the lens and camera separation were less than the viewer's IPD they exhibited compression of space; the adjusted angle was smaller than their baseline setting. The reverse pattern was seen when the lens and camera separation were larger than the viewer's IPD. Linear regression analysis supported these conclusions with a significant correlation between the magnitude of IPD mismatch and the deviation of angle adjustment relative to the baseline condition. We show that these results are well explained by a geometric model that considers the scaling of disparity and convergence due to shifts in virtual camera and optical inter-axial separations relative to an observer's IPD.},
author = {Tong, J. and Allison, R. S. and Wilcox, L. M.},
booktitle = {Journal of Vision (VSS Abstracts)},
date-added = {2022-12-15 18:24:50 -0500},
date-modified = {2022-12-15 18:25:27 -0500},
doi = {10.1167/jov.22.14.3564},
keywords = {Stereopsis},
pages = {3564},
title = {Stereoscopic distortions when viewing geometry does not match inter-pupillary distance},
volume = {22},
year = {2022},
url-1 = {https://doi.org/10.1167/jov.22.14.3564}}
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We tested this prediction using a VR headset in which the inter-axial separation of virtual cameras and the separation between the optics are coupled. Observers (n=15) were asked to adjust the angle between two intersecting textured-surfaces until it appeared to be 90$\\,^{∘}$, at each of three viewing distances. In the baseline condition the lens and camera separations matched each observer's IPD. In two `mismatch' conditions (tested in separate blocks) the lens and camera separations were set to the maximum (71 mm) and minimum (59 mm) allowed by the headset. We found that when the lens and camera separation were less than the viewer's IPD they exhibited compression of space; the adjusted angle was smaller than their baseline setting. The reverse pattern was seen when the lens and camera separation were larger than the viewer's IPD. 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