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Reliable gradient search directions for kurtosis-based deflationary ICA: Application to physiological signal processing.

Abstract : Efficient gradient search directions for the optimisation of the kurtosis-based deflationary RobustICA algorithm in the case of real-valued data are proposed in this paper. The proposed scheme employs, in the gradient-like algorithm typically used to optimise the considered kurtosis-based objective function, search directions computed from a more reliable approximation of the negentropy than the kurtosis. The proposed scheme inherits the exact line search of the conventional RobustICA for which a good convergence property through a given direction is guaranteed. The efficiency of the proposed scheme is evaluated in terms of estimation quality, the execution time and the iterations count as a function of the number of used sensors and for different signal to noise ratios in the contexts of non-invasive epileptic ElectroEncephaloGraphic (EEG) and Magnetic Resonance Spectroscopic (MRS) analysis. The obtained results show that the proposed approach offer the best estimation performance/iterations count and execution time trade-off, especially in the case of high number of sensors.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01624648
Contributor : Lotfi Senhadji <>
Submitted on : Thursday, October 26, 2017 - 3:54:51 PM
Last modification on : Monday, September 9, 2019 - 2:19:47 PM
Long-term archiving on: : Saturday, January 27, 2018 - 3:51:44 PM

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M Saleh, A. Karfoul, A. Kachenoura, L. Senhadji, Laurent Albera. Reliable gradient search directions for kurtosis-based deflationary ICA: Application to physiological signal processing.. 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Jul 2017, Jeju Island, South Korea. pp.2790-2793, ⟨10.1109/EMBC.2017.8037436⟩. ⟨hal-01624648⟩

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