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Affine operations plus symmetry yield perception of metric shape with large perspective changes (≥ 45 degrees): Data and model
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction.
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2014 (English)In: Journal of Experimental Psychology: Human Perception and Performance, ISSN 0096-1523, E-ISSN 1939-1277, Vol. 40, no 1, 83-93 p.Article in journal (Refereed) Published
Abstract [en]

G. P. Bingham and M. Lind (2008, Large continuous perspective transformations are necessary and sufficient for accurate perception of metric shape, Perception & Psychophysics, Vol. 70, pp. 524-540) showed that observers could perceive metric shape, given perspective changes >= 45 degrees relative to a principal axis of elliptical cylinders. In this article, we tested (a) arbitrary perspective changes of 45 degrees, (b) whether perception gradually improves with more perspective change, (c) speed of rotation, (d) whether this works with other shapes (asymmetric polyhedrons), (e) different slants, and (f) perspective changes >45 degrees. Experiment 1 compared 45 degrees perspective change away from, versus centered on, a principal axis. Observers adjusted an ellipse to match the cross-section of an elliptical cylinder viewed in a stereo-motion display. Experiment 2 tested whether performance would improve gradually with increases in perspective change, or suddenly with a 45 degrees change. We also tested speed of rotation. Experiment 3 tested (a) asymmetric polyhedrons, (b) perspective change beyond 45 degrees, and (c) the effect of slant. The results showed (a) a particular perspective was not required, (b) judgments only improved with >= 45 degrees change, (c) speed was not relevant, (d) it worked with asymmetric polyhedrons, (e) slant was not relevant, and (f) judgments remained accurate beyond 45 degrees of change. A model shows how affine operations, together with a symmetry yielded by 45 degrees perspective change, bootstrap perception of metric shape.

Place, publisher, year, edition, pages
2014. Vol. 40, no 1, 83-93 p.
Keyword [en]
3D shape perception, affine geometry, space perception, metric, structure-from-motion, stereo motion
National Category
Computer Vision and Robotics (Autonomous Systems)
Identifiers
URN: urn:nbn:se:uu:diva-220290DOI: 10.1037/a0033245ISI: 000330848300010OAI: oai:DiVA.org:uu-220290DiVA: diva2:706035
Available from: 2013-06-10 Created: 2014-03-12 Last updated: 2017-12-05Bibliographically approved

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Lind, Mats

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