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  Shape from smear

Holtmann-Rice, D., & Fleming, R. (2009). Shape from smear. Poster presented at 32nd European Conference on Visual Perception (ECVP 2009), Regensburg, Germany.

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Holtmann-Rice, DN1, 2, Author           
Fleming, RW1, 2, 3, Author           
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Research Group Computational Vision and Neuroscience, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497805              

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 Abstract: Recent work indicates that the patterns of scales and orientations in an image ('orientation fields') may play an important role in 3-D shape perception. If true, it should be possible to elicit percepts of specific 3-D shapes using stimuli containing only an appropriate orientation field. To investigate this, we use line-integral convolution to 'smear (coerce) 2-D noise patterns to have a geometrically 'correct' orientation field (ie, as similar as possible to the orientation field present in the rendering of some object). The spatial scales are also modulated to be physically accurate. Importantly, the image generation process is entirely based on 2-D filtering operations, and is fundamentally different from a physically realistic rendering. Despite this, the resulting pattern elicits almost as vivid an impression of the object's 3-D shape as a true rendering. Such images were used in depth comparison and gauge figure tasks to assess the relative contribution of spatial scales and orientation fields to shape perception; as well as the dramatic breakdown of shape perception resulting from physically unrealistic orientation and scale configurations. By examining the accuracy with which subjects are able to make metric judgments (relative depth and surface orientation) about the shape percepts evoked by these patterns, we demonstrate that the continuous variations of orientation and spatial scale across an image can play a key role in 3-D shape inference.

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 Dates: 2009-08
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: HoltmannRiceF2009
DOI: 10.1177/03010066090380S101
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Title: 32nd European Conference on Visual Perception (ECVP 2009)
Place of Event: Regensburg, Germany
Start-/End Date: 2009-08-24 - 2009-08-28

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 38 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 28 - 29 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369