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| Research article summary (published 29 Sep 2002): |
The role of complex cells in object recognition.
Full Abstract
Primate's primary visual cortex (V1) is dominated by complex cells. This choice of nature seems puzzling, as complex cells are insensitive to spatial phase--information which is generally believed to be essential for perceptual characterization and recognition of images. Modeling complex cells as Gabor wavelet magnitudes, we have mathematically and empirically examined the information content of their responses. Our results show that in spite of phase insensitivity of individual complex cell responses, population responses contain sufficient information to capture the perceptual essence of images. A complex cell type representation seems to be not only sufficiently discriminating for object identification, but also--due to its inherent ambiguities--robust to changes in background, lighting, and small deformations.
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Author information
Author/s: Shams, Ladan (L); von der Malsburg, Christoph (C);
Affiliation: Division of Biology, California Institute of Technology, MC 139-74, Pasadena, CA 91125, USA. ladan@caltech.edu
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Journal: Vision research (Vision Res), published in England. (Language: eng)
Reference: 2002-Oct; vol 42 (issue 22) : pp 2547-54
Dates: Created 2002/11/26; Completed 2003/04/07; Revised 2006/11/15;
PMID: 12445848, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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