A Composite Filter-Based Approach for Artifact Elimination and Segmentation of EEG Signal for Application in Brain-Computer Interface

Abstract

Electroencephalogram (EEG) signal is one of the important bio signals which can characterize different states of action. These signals are often contaminated with different artifacts. Dominant artifacts are baseline wandering, power line and eye blink noise. The frequencies of these artifacts overlap with the frequencies of the EEG sub bands and create a major challenge for analysis. In the present paper, a computationally simple, robust to noise and accurate EEG segmentation algorithm is developed for all dominant noise elimination from the EEG signal. The proposed method uses moving average and Discrete Wavelet Transform filtering techniques. The novelty of the present work lies in the use of moving average and DWT filter which eliminates the major noises without affecting the properties of the signal and subsequent sub band segmentation without additional signal processing. The choice of db4 as mother wavelet reduces the computational time and complexity. The method has been tested on real time signals acquired from thirty individuals of varying age group. Comparative plot of acquired and clean electroencephalogram justifies the applicability and potentiality of the method for various applications including brain computer interface. Relative Root Mean Square Error (RRMSE) between the acquired and filtered signal is only 0.14 ± 0.03 which reveals that the filtering stage did not had any loss to the vital signature properties. The earlier reported literatures have the best possible value of RRMSE to be 0.42 ± 0.00 which is quite a distant apart from the present result. The proposed algorithm can be a suitable option for  major artifact elimination and EEG segmentation in low-cost single-channel EEG systems because of its (a) computationally efficiency; (b) filtering contaminated EEG signals in millisecond time resolution; (b) automatic, requiring no human intervention; (c) non-invasive, preserving unaltered EEG intervals without contamination; and (d) low-complexity, requiring no artifact reference.

Received: 4 March 2024 | Revised: 28 May 2024 | Accepted: 5 July 2024

Conflicts of Interest

The authors declare that they have no conflicts of interest to this work.

Data Availability Statement

Data available on request from the corresponding author upon reasonable request.

Author Contribution Statement

Avishek Paul: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Resources, Data curation, Writing - original sraft, Writing - review & editing, Visualization, Supervision, Project administration. Saurabh Pal and Madhuchhanda Mitra: Conceptualization, Investigation, Writing - review & editing, Supervision, Project administration.SeConceptualization, Investigation, Writing - Review & Editing, Supervision, Project administration.