EEG feature extraction based on wavelet packet decomposition for brain computer interface

In the study of brain computer interfaces, a novel method was proposed in this paper for the feature extraction of electroencephalogram (EEG). It was based on wavelet packet decomposition (WPD). The energy of special sub-bands and corresponding coefficients of wavelet packet decomposition were selected as features which have maximal separability according to the Fisher distance criterion. The eigenvector was obtained for classification by combining the effective features from different channels; its performance was evaluated by separability and pattern recognition accuracy using the datasets of BCI 2003 Competition. The classification results have proved the effectiveness of the proposed method. This technology provides another useful way to EEG feature extraction in BCIs.