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
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.