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dc.contributor.authorCunningham, Robert K.en_US
dc.contributor.authorBeck, Jacoben_US
dc.contributor.authorMingolla, Ennioen_US
dc.date.accessioned2011-11-14T19:07:13Z
dc.date.available2011-11-14T19:07:13Z
dc.date.issued1996-11en_US
dc.identifier.urihttp://hdl.handle.net/2144/2333
dc.description.abstractVisual search is extended from the domain of polygonal figures presented on a uniform background to scenes in which search is for a photo-realistic object in a dense, naturalistic background. Scene generation for these displays relies on a powerful solid modeling program to define the three dimensional forms, surface properties, relative positions, and illumination of the objects and a rendering program to produce an image. Search in the presented experiments is for a rock with specific properties among other, similar rocks, although the method described can be generalized to other situations. Using this technique we explore the effects of illumination and shadows in aiding search for a rock in front of and closer to the viewer than other rocks in the scene. For these scenes, shadows of two different contrast levels can significantly deet·ease reaction times for displays in which target rocks are similar to distractor rocks. However, when the target rock is itself easily distinguishable from dis tractors on the basis of form, the presence or absence of shadows has no discernible effect. To relate our findings to those for earlier polygonal displays, we simplified the non-shadow displays so that only boundary information remained. For these simpler displays, search slopes (the reaction time as a function of the number of distractors) were significantly faster, indicating that the more complex photo-realistic objects require more time to process for visual search. In contrast with several previous experiments involving polygonal figures, we found no evidence for an effect of illumination direction on search times.en_US
dc.language.isoen_USen_US
dc.publisherBoston University Center for Adaptive Systems and Department of Cognitive and Neural Systemsen_US
dc.relation.ispartofseriesBUCAS/CNS Technical Reports; BUCAS/CNS-TR-1996-034en_US
dc.rightsCopyright 1996 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.subjectVisual searchen_US
dc.subjectShadingen_US
dc.subjectShadowsen_US
dc.subjectIllumination directionen_US
dc.subjectPhoto-realistic renderingen_US
dc.subjectNaturalistic sceneen_US
dc.titleApproaching Visual Search in Photo-Realistic Scenesen_US
dc.typeTechnical Reporten_US
dc.rights.holderBoston University Trusteesen_US


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