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dc.contributor.authorPessoa, Luizen_US
dc.contributor.authorMingolla, Ennioen_US
dc.contributor.authorArend, Larryen_US
dc.date.accessioned2011-11-14T18:50:16Z
dc.date.available2011-11-14T18:50:16Z
dc.date.issued1995-08en_US
dc.identifier.urihttps://hdl.handle.net/2144/2197
dc.description.abstractLightness constancy requires the visual system to somehow "parse" the input scene into illumination and reflectance components. Experiments on the perception of lightness for 3-D curved objects show that human observers are able to perform such a decomposition for some scenes but not for others. Lightness constancy was quite good when a rich local gray level context was provided. Deviations occurred when both illumination and reflectance changed along the surface of the objects. Does the perception of a 3-D surface and illuminant layout help calibrate lightness judgements? Our results showed a small but consistent improvement between lightness matches on ellipsoid shapes compared to flat rectangle shapes under similar illumination conditions. Illumination change over 3-D forms is therefore taken into account in lightness perception.en_US
dc.description.sponsorshipCOPPE/UFRJ, Brazil; Air Force Office of Scientific Research (F49620-92-J-0334); Office of Naval Research (N00014-J-4100, N00014-94-1-0597)en_US
dc.language.isoen_USen_US
dc.publisherBoston University Center for Adaptive Systems and Department of Cognitive and Neural Systemsen_US
dc.relation.ispartofseriesBU CAS/CNS Technical Reports;CAS/CNS-TR-1995-020en_US
dc.rightsCopyright 1995 Boston University. Permission to copy without fee all or part of this material is granted provided that: 1. The copies are not made or distributed for direct commercial advantage; 2. the report title, author, document number, and release date appear, and notice is given that copying is by permission of BOSTON UNIVERSITY TRUSTEES. To copy otherwise, or to republish, requires a fee and / or special permission.en_US
dc.titleThe Perception of Lightness in 3-D Curved Objectsen_US
dc.typeTechnical Reporten_US
dc.rights.holderBoston University Trusteesen_US


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