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Finding and recognizing objects in natural scenes : complementary computations in the dorsal and ventral visual systems
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Rolls, Edmund T. and Webb, Tristan J. (2014) Finding and recognizing objects in natural scenes : complementary computations in the dorsal and ventral visual systems. Frontiers in Computational Neuroscience, Volume 8 . Article number 85. doi:10.3389/fncom.2014.00085 ISSN 1662-5188.
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Official URL: http://dx.doi.org/10.3389/fncom.2014.00085
Abstract
Searching for and recognizing objects in complex natural scenes is implemented by multiple saccades until the eyes reach within the reduced receptive field sizes of inferior temporal cortex (IT) neurons. We analyze and model how the dorsal and ventral visual streams both contribute to this. Saliency detection in the dorsal visual system including area LIP is modeled by graph-based visual saliency, and allows the eyes to fixate potential objects within several degrees. Visual information at the fixated location subtending approximately 9° corresponding to the receptive fields of IT neurons is then passed through a four layer hierarchical model of the ventral cortical visual system, VisNet. We show that VisNet can be trained using a synaptic modification rule with a short-term memory trace of recent neuronal activity to capture both the required view and translation invariances to allow in the model approximately 90% correct object recognition for 4 objects shown in any view across a range of 135° anywhere in a scene. The model was able to generalize correctly within the four trained views and the 25 trained translations. This approach analyses the principles by which complementary computations in the dorsal and ventral visual cortical streams enable objects to be located and recognized in complex natural scenes.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Computer Science | ||||||||
Library of Congress Subject Headings (LCSH): | Image processing -- Digital techniques, Visual cortex, Pattern recognition systems | ||||||||
Journal or Publication Title: | Frontiers in Computational Neuroscience | ||||||||
Publisher: | Frontiers Research Foundation | ||||||||
ISSN: | 1662-5188 | ||||||||
Official Date: | 12 August 2014 | ||||||||
Dates: |
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Volume: | Volume 8 | ||||||||
Number of Pages: | 19 | ||||||||
Article Number: | Article number 85 | ||||||||
DOI: | 10.3389/fncom.2014.00085 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 28 December 2015 | ||||||||
Date of first compliant Open Access: | 28 December 2015 | ||||||||
Embodied As: | 1 |
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