Robust Principal Component Analysis Using Alpha Divergence

摘要

In this paper, a new robust principal component analysis (RPCA) method which enables us to exploit the main components of a given corrupted data with non Gaussian outliers is proposed. This method is based on the $lpha-$divergence which is a parametric measure from information geometry. The proposed method is adjustable using a hyperparameter $lpha$ and reduces to the classical PCA as a particular case. In order to derive the main components, the $lpha-$divergence between the empirical data distribution and the assumed model for the distribution is minimized with respect to the unknown parameters. The singular value decomposition (SVD) of the estimated covariance matrix is then used to exploit the main direction of the data. The proposed method is applied to some video and signal processing applications and the results show the superiority of the proposed method over classical PCA and other existing robust methods.