Learning different light prior distributions for different contexts
Learning different light prior distributions for different contexts
The pattern of shading across an image can provide a rich sense of object shape. Our ability to use shading information is remarkable given the infinite possible combinations of illumination, shape and reflectance that could have produced any given image. Illumination can change dramatically across environments (e.g. indoor vs. outdoor) and times of day (e.g. mid-day vs. sunset). Here we show that people can learn to associate particular illumination conditions with particular contexts, to aid shape-from-shading. Following a few hours of visual–haptic training, observers modified their shape estimates according to the illumination expected in the prevailing context. Our observers learned that red lighting was roughly overhead (consistent with their previous assumption of lighting direction), whereas green lighting was shifted by 10°. Greater learning occurred when training for the two contexts (red or green light) was intermingled rather than when it was sequentially blocked.
99-104
Kerrigan, Iona S
5d9af8d5-a987-4603-a26c-6c5adefbdf91
Adams, Wendy J.
25685aaa-fc54-4d25-8d65-f35f4c5ab688
April 2013
Kerrigan, Iona S
5d9af8d5-a987-4603-a26c-6c5adefbdf91
Adams, Wendy J.
25685aaa-fc54-4d25-8d65-f35f4c5ab688
Abstract
The pattern of shading across an image can provide a rich sense of object shape. Our ability to use shading information is remarkable given the infinite possible combinations of illumination, shape and reflectance that could have produced any given image. Illumination can change dramatically across environments (e.g. indoor vs. outdoor) and times of day (e.g. mid-day vs. sunset). Here we show that people can learn to associate particular illumination conditions with particular contexts, to aid shape-from-shading. Following a few hours of visual–haptic training, observers modified their shape estimates according to the illumination expected in the prevailing context. Our observers learned that red lighting was roughly overhead (consistent with their previous assumption of lighting direction), whereas green lighting was shifted by 10°. Greater learning occurred when training for the two contexts (red or green light) was intermingled rather than when it was sequentially blocked.
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e-pub ahead of print date: January 2013
Published date: April 2013
Organisations:
Psychology
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Local EPrints ID: 347779
URI: http://eprints.soton.ac.uk/id/eprint/347779
ISSN: 0010-0277
PURE UUID: 3326c338-f43c-40c1-bf9b-c4c802871993
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Date deposited: 30 Jan 2013 15:29
Last modified: 15 Mar 2024 03:19
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Author:
Iona S Kerrigan
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