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Perceptual biases in the interpretation of non-rigid structure from motion
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Title
Perceptual biases in the interpretation of non-rigid structure from motion
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Choi
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Ryne
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Ryne Choi
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author
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Singh
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Manish
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Manish Singh
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Advisory Committee
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chair
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Feldman
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Jacob
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Jacob Feldman
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internal member
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Kowler
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Eileen
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Eileen Kowler
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Advisory Committee
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Rutgers University
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School of Graduate Studies
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theses
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2020
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2020-05
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2020
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English
Abstract
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While structure-from-motion (SFM) studies have largely focused on the perception of rigidly moving 3D objects, recent studies have shown that observers are good at perceiving certain kinds of non-rigid transformations parencite{Jain2011}. Our overarching goal is to understand what types of non-rigid transformations are perceivable in SFM. As a first step towards this goal, this study investigates the role of biological plausibility of shape transformations.
Experiment 1 compared the perception of two non-rigid transformations: part-orientation change (which is more common in animate motion, e.g. part-wise articulation of limbs) and part-length change (which is less common). Stimuli consisted of an ellipsoid with a protruding part that underwent a non-rigid length change as the whole object rotated back and forth. We manipulated the extent of length change and subjects judged whether the part was undergoing a length or orientation change. In this experiment, the image of the part was always contained within the silhouette of the ellipsoid. Results showed a clear range where length change was misperceived as orientation change.
Experiment 2 further investigated the misperception of non-rigid length change. The part was now visible in the silhouette. We observed a misperception of non-rigid length change as a rigidly-attached part with an "illusory" non-orthogonal horizontal angle relative to the ellipsoid. Observers adjusted the perceived angle between the part and the ellipsoid. We then compared the perceived horizontal angle to model predictions based on a reinterpretation of the length change in terms of a fixed horizontal angle between the part and the main body, with no length change. Even with no free parameters, the model closely tracked observers’ data.
In summary, an SFM stimulus in which a part undergoes a length change, tends to be misperceived either as an orientation change (Exp. 1), or as a fixed but "illusory" orientation (Exp. 2). The results suggest that the visual system may be biased towards more biologically plausible interpretations of non-rigid motion.
Experiment 1 compared the perception of two non-rigid transformations: part-orientation change (which is more common in animate motion, e.g. part-wise articulation of limbs) and part-length change (which is less common). Stimuli consisted of an ellipsoid with a protruding part that underwent a non-rigid length change as the whole object rotated back and forth. We manipulated the extent of length change and subjects judged whether the part was undergoing a length or orientation change. In this experiment, the image of the part was always contained within the silhouette of the ellipsoid. Results showed a clear range where length change was misperceived as orientation change.
Experiment 2 further investigated the misperception of non-rigid length change. The part was now visible in the silhouette. We observed a misperception of non-rigid length change as a rigidly-attached part with an "illusory" non-orthogonal horizontal angle relative to the ellipsoid. Observers adjusted the perceived angle between the part and the ellipsoid. We then compared the perceived horizontal angle to model predictions based on a reinterpretation of the length change in terms of a fixed horizontal angle between the part and the main body, with no length change. Even with no free parameters, the model closely tracked observers’ data.
In summary, an SFM stimulus in which a part undergoes a length change, tends to be misperceived either as an orientation change (Exp. 1), or as a fixed but "illusory" orientation (Exp. 2). The results suggest that the visual system may be biased towards more biologically plausible interpretations of non-rigid motion.
Subject
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Topic
Structure from motion
Subject
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Topic
Motion perception (Vision)
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Topic
Psychology
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Rutgers University Electronic Theses and Dissertations
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ETD_10909
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1 online resource (vi, 25 pages) : illustrations
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M.S.
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Includes bibliographical references
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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doi:10.7282/t3-hr7g-kw11
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ETD graduate
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The author owns the copyright to this work.
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Choi
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Ryne
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Permission or license
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2020-04-30 19:34:32
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Ryne Choi
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Rutgers University. School of Graduate Studies
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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Copyright protected
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Status
Open
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Permission or license
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