September 2021
Volume 21, Issue 9
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2021
How far away is your phone in this picture? Determining object distance and size in a 2D scene
Author Affiliations & Notes
  • John Jong-Jin Kim
    Center for Vision Research, York University, Toronto, Canada
  • Laurence Harris
    Center for Vision Research, York University, Toronto, Canada
  • Footnotes
    Acknowledgements  LRH is supported by Discovery Grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada and the Canadian Space Agency. JJK holds doctorate scholarship from VISTA program.
Journal of Vision September 2021, Vol.21, 2580. doi:https://doi.org/10.1167/jov.21.9.2580
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      John Jong-Jin Kim, Laurence Harris; How far away is your phone in this picture? Determining object distance and size in a 2D scene. Journal of Vision 2021;21(9):2580. doi: https://doi.org/10.1167/jov.21.9.2580.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

How do we judge the distance of familiar objects seen within a picture? If the physical size is known, the object’s distance can be judged relative to other objects in the scene, but without such references the viewer must estimate its distance solely from their knowledge of its size. How well can we do that? Using remote testing via PAVLOVIA, participants viewed a rectangular block, scaled to the size of their personal smartphone, placed upright in a hallway scene that provided ambiguous distance information, displayed on a computer screen viewed at 50cm. In exp1 (n=74), they were given 5 sizes of block and adjusted their distances to look correct based on the known physical phone size. In a second task, they adjusted its visual size when it was placed at the same distances they had set in the first task. In exp2 (n=60), the task order was reversed, and distances were also given in meters. Participants could differentiate the distances and sizes of their phone in the correct order (small farthest) but consistently set its size larger than expected (p < .001). When setting its size at the distance they had previously chosen as consistent with a given size, they surprisingly set it significantly larger (p < .001). In exp2, where they set size first, the distances set in task 2 were not significantly different from task 1 (p = .936). Participants could not use distance given in meters. Our results suggest that people misjudge the visual size of a familiar object based on its perceived distance, setting it much too big. When determining object distance based on visual size, however, they are quite consistent. The perceptual relationship between size and distance seems to break down when an object of known physical size is placed in a 2D scene.

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