Nonlinear Blind Source Separation by Integrating Independent Component Analysis and Slow Feature Analysis
Tobias Blaschke, Laurenz Wiskott · 2004
In contrast to the equivalence of linear blind source separation and linear independent component analysis it is not possible to recover the origi-nal source signal from some unknown nonlinear transformations of the sources using only the independence assumption. Integrating the ob-jectives of statistical independence and temporal slowness removes this indeterminacy leading to a new method for nonlinear blind source sepa-ration. The principle of temporal slowness is adopted from slow feature analysis, an unsupervised method to extract slowly varying features from a given observed vectorial signal. The performance of the algorithm is demonstrated on nonlinearly mixed speech data. 1