An Intelligent Approach for Variable Size Segmentation of Non-stationary Signals

Hamed Azami, Hamid Hassanpour, Javier Escudero, Saeid Sanei

Research output: Contribution to journalArticlepeer-review


In numerous signal processing applications, non-stationary signals should be segmented to piece-wise stationary epochs before being further analyzed. In this article, an enhanced segmentation method based on fractal dimension (FD) and evolutionary algorithms (EAs) for non-stationary signals, like electroencephalogram (EEG), magnetoencephalogram (MEG) and electromyogram (EMG), is proposed. In the proposed approach, discrete wavelet transform (DWT) decomposes the signal into orthonormal time series with different frequency bands. Then, the FD of the decomposed signal is calculated within two sliding windows. The accuracy of the segmentation method depends on these parameters of FD. In this study, four EAs are used to increase the accuracy of segmentation method and choose acceptable parameters of the FD. These include particle swarm optimization (PSO), new PSO (NPSO), PSO with mutation, and bee colony optimization (BCO). The suggested methods are compared with other most popular approaches (improved nonlinear energy operator (INLEO), wavelet generalized likelihood ratio (WGLR), and Varri’s method) using synthetic signals, real EEG data, and the difference of the received photons of galactic objects. The results demonstrate the absolute superiority of the suggested approach.
Original languageEnglish
Pages (from-to)687-698
JournalJournal of Advanced Research
Issue number5
Early online date14 Mar 2014
Publication statusPublished - 19 Mar 2014


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