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Topographic ICA as a Model of Natural Image Statistics
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Topographic ICA as a Model of Natural Image Statistics
Aapo Hyvärinen7 , Patrik O. Hoyer7 and Mika Inki7
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Neural Networks Research Centre, Helsinki University of Technology, P.O. Box 5400, FIN-02015 Hut, Finland |
Abstract
Independent component analysis (ICA), which is equivalent to linear sparse coding, has been recently used as a model of natural
image statistics and V1 receptive fields. Olshausen and Field applied the principle of maximizing the sparseness of the coefficients
of a linear representation to extract features from natural images. This leads to the emergence of oriented linear filters
that have simultaneous localization in space and in frequency, thus resembling Gabor functions and V1 simple cell receptive
fields. In this paper, we extend this model to explain emergence of V1 topography. This is done by ordering the basis vectors
so that vectors with strong higher-order correlations are near to each other. This is a new principle of topographic organization,
and may be more relevant to natural image statistics than the more conventional topographic ordering based on Euclidean distances.
For example, this topographic ordering leads to simultaneous emergence of complex cell properties: neighbourhoods act like
complex cells.
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