Increasing parallactic change compresses depth and perceived distance. Teng, X., Wilcox, L. M., & Allison, R. S. In Proccedings of the Scottish Vision Group Meeting. 2023. ![Increasing parallactic change compresses depth and perceived distance [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper -1 abstract bibtex Motion parallax provides information for both absolute distance and relative depth judgments. For a given head motion and given depth interval, the parallactic change is inversely proportional to the square of egocentric distance. In this presentation we will discuss analysis of a subset of data from a larger study. On each trial, monocularly-viewing observers made left-right swaying head motions at 1.0 Hz to induce the corresponding virtual motion shown on a head mounted display. A gain distortion was applied to the virtual motion, ranging from half to twice the physical motion. While moving, observers adjusted the angle of a vertical fold stimulus presented at distances from 1.3 to 6.0 m so it appeared to be at 90 deg. After the adjustment was made another virtual environment was presented. While standing stationary observers matched a pole to the apparent distance of the peak of the previously seen fold. On average observers adjusted the folds to have smaller depth as gain increased or distance decreased. Estimates of target distance also declined with increasing gain. As both distance and gain affect the amount of parallactic change we analysed to what extent our results could be explained by this variable alone. Our analysis confirmed that both of these measures varied consistently with parallactic change. We will discuss the implications of these findings for depth cue scaling, and for anticipated tolerance to tracking errors in virtual reality systems.
@incollection{Teng:2023aa,
abstract = {Motion parallax provides information for both absolute distance and relative depth judgments. For a given head motion and given depth interval, the parallactic change is inversely proportional to the square of egocentric distance. In this presentation we will discuss analysis of a subset of data from a larger study. On each trial, monocularly-viewing observers made left-right swaying head motions at 1.0 Hz to induce the corresponding virtual motion shown on a head mounted display. A gain distortion was applied to the virtual motion, ranging from half to twice the physical motion. While moving, observers adjusted the angle of a vertical fold stimulus presented at distances from 1.3 to 6.0 m so it appeared to be at 90 deg. After the adjustment was made another virtual environment was presented. While standing stationary observers matched a pole to the apparent distance of the peak of the previously seen fold. On average observers adjusted the folds to have smaller depth as gain increased or distance decreased. Estimates of target distance also declined with increasing gain. As both distance and gain affect the amount of parallactic change we analysed to what extent our results could be explained by this variable alone. Our analysis confirmed that both of these measures varied consistently with parallactic change. We will discuss the implications of these findings for depth cue scaling, and for anticipated tolerance to tracking errors in virtual reality systems. },
author = {Teng, X. and Wilcox, L. M. and Allison, R. S.},
booktitle = {Proccedings of the Scottish Vision Group Meeting},
date-added = {2023-08-30 10:56:03 -0400},
date-modified = {2023-08-30 10:57:49 -0400},
keywords = {Stereopsis},
title = {Increasing parallactic change compresses depth and perceived distance},
url = {https://psyresearch.abertay.ac.uk/SVG2023/Abstracts.htm},
year = {2023},
url-1 = {https://psyresearch.abertay.ac.uk/SVG2023/Abstracts.htm}}
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After the adjustment was made another virtual environment was presented. While standing stationary observers matched a pole to the apparent distance of the peak of the previously seen fold. On average observers adjusted the folds to have smaller depth as gain increased or distance decreased. Estimates of target distance also declined with increasing gain. As both distance and gain affect the amount of parallactic change we analysed to what extent our results could be explained by this variable alone. Our analysis confirmed that both of these measures varied consistently with parallactic change. We will discuss the implications of these findings for depth cue scaling, and for anticipated tolerance to tracking errors in virtual reality systems. 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In this presentation we will discuss analysis of a subset of data from a larger study. On each trial, monocularly-viewing observers made left-right swaying head motions at 1.0 Hz to induce the corresponding virtual motion shown on a head mounted display. A gain distortion was applied to the virtual motion, ranging from half to twice the physical motion. While moving, observers adjusted the angle of a vertical fold stimulus presented at distances from 1.3 to 6.0 m so it appeared to be at 90 deg. After the adjustment was made another virtual environment was presented. While standing stationary observers matched a pole to the apparent distance of the peak of the previously seen fold. On average observers adjusted the folds to have smaller depth as gain increased or distance decreased. Estimates of target distance also declined with increasing gain. 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