Document Detail


Stereoprocessing of cyclopean depth images: horizontally elongated summation fields.
MedLine Citation:
PMID:  11448715     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The study evaluated how the detection efficiency varies with the length and width of Gabor wavelets of depth ripple in random element patterns. For local (one-cycle) wavelets, there was no anisotropy with respect to wavelet orientation, implying equal efficiency for processing shear versus compression disparities at threshold. The processing for larger patterns of depth ripple did not correspond to a fixed summation field but varied in size with spatial frequency, and in shape with orientation of depth ripples, up to four cycles of a horizontal bar at 0.5 cy/deg, or 8 degrees of visual angle. The presence of such extended summation fields in only one orientation is incompatible with the idea of local attentional processing, with a single disparity channel or with an adaptive mechanism that could accommodate to any form of disparity image. Thus, these results suggest the presence of a multichannel hypercyclopean level of processing specialized for horizontal depth contours, whose only disparity information is in their surface texture.
Authors:
C W Tyler; L L Kontsevich
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  41     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-07-12     Completed Date:  2001-08-16     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  2235-43     Citation Subset:  IM    
Affiliation:
Smith-Kettlewell Eye Research Institute, 2318 Fillmore Street, San Francisco, CA 94115, USA. cwt@skivs.ski.org
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MeSH Terms
Descriptor/Qualifier:
Attention / physiology*
Computer Graphics
Depth Perception / physiology*
Humans
Psychophysics
Vision, Binocular / physiology*
Grant Support
ID/Acronym/Agency:
EY07890/EY/NEI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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