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Comment déchiffrer le code impulsionnel de la Vision? Étude du flux parallèle, asynchrone et épars dans le traitement visuel ultra-rapide.

Abstract : How to decipher vision's spiking code? Study of the parallel, asynchronous and sparse flow in the ultra-rapid visual processing. We build and study dynamical models of visual coding as a parallel and asynchronous flow of information coded thanks to their succession in time. We will at first base the mechanisms of this code on the biological processes on the scale of the neurone and synapse. In particular, synaptic plasticity may induce the non-supervised extraction of coherent information in the flow of the neuronal impulses. Coding by the latency of the first spike can defines a code in the optic nerve based on multi-scale architecture. We extended these results by using an ecological approach allowing thanks to the \emph(statistics of natural images) the quantization of analog value by the spikes' rank. This visual code is based on a hierarchical feed-forward architecture which is distinguished, in addition to its simplicity, by its mathematical and computational performances. We will meet the needs for an effective model of Vision by defining a theory of \emph(over-complete event representation) of the image. This formalization leads then to a strategy of a \emph(sparse spike code) by defining lateral interactions. Thanks to a reinforcement learning rule, this strategy can then be extended to a model of an \emph(adaptive cortical column) which shows emergence of representation dictionaries. Moreover, this paradigm adapts particularly to the construction of a saliency map. These techniques allow emergence of new tools for image processing and active vision which are particularly adapted to distributed computing architectures.
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https://tel.archives-ouvertes.fr/tel-00002693
Contributor : Perrinet Laurent <>
Submitted on : Monday, April 7, 2003 - 5:50:42 PM
Last modification on : Tuesday, March 26, 2019 - 2:28:03 PM
Long-term archiving on: : Friday, April 2, 2010 - 6:59:37 PM

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Laurent Perrinet. Comment déchiffrer le code impulsionnel de la Vision? Étude du flux parallèle, asynchrone et épars dans le traitement visuel ultra-rapide.. domain_other. Université Paul Sabatier - Toulouse III, 2003. Français. ⟨tel-00002693⟩

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