Coding Static Natural Images Using Spiking Event Times : Do Neurons Cooperate ?  

Oleh:

Perrinet, L. ; Samuelides, M. ; Thorpe, S.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: IEEE Transactions on Neural Networks vol. 15 no. 5 (Sep. 2004), page 1164-1175.
Topik: NEURONS; coding static; natural images; spiking event times; neurons; cooperate

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: II36.11 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

To understand possible strategies of temporal spike coding in the central nervous system, we study functional neuromimetic models of visual processing for static images. We will first present the retinal model which was introduced by Van Rullen and Thorpe and which represents the multiscale contrast values of the image using an orthonormal wavelet transform. These analog values activate a set of spiking neurons which each fire once to produce an asynchronous wave of spikes. According to this model, the image may be progressively reconstructed from this spike wave thanks to regularities in the statistics of the coefficients determined with natural images. Here, we study mathematically how the quality of information transmission carried by this temporal representation varies over time. In particular, we study how these regularities can be used to optimize information transmission by using a form of temporal cooperation of neurons to code analog values. The original model used wavelet transforms that are close to orthogonal. However, the selectivity of realistic neurons overlap, and we propose an extension of the previous model by adding a spatial cooperation between filters. This model extends the previous scheme for arbitrary - and possibly non orthogonal - representations of features in the images. In particular, we compared the performance of increasingly over - complete representations in the retina. Results show that this algorithm provides an efficient spike coding strategy for low - level visual processing which may adapt to the complexity of the visual input.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali