ICA 2007

ICA 2007
7th International Conference on
Independent Component Analysis
and Signal Separation

London, UK        9 - 12 September 2007

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Paper No: 116

Modeling and Estimation of Dependent Subspaces with Non-Radially Symmetric and Skewed Densities

Author(s): Jason Palmer, Ken Kreutz-Delgado, Bhaskar Rao, Scott Makeig

Abstract

We extend the Gaussian scale mixture model of dependent subspace source densities to include non-radially symmetric densities using Generalized Gaussian random variables linked by a common variance. We also introduce the modeling of skew in source densities and subspaces using a generalization of the Normal Variance-Mean mixture model. We give closed form expressions for subspace likelihoods and parameter updates in the EM algorithm.

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