Empirical Mode Decomposition and Wavelet Transform Based ECG Data Compression Scheme - 13/02/21
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Graphical abstract |
Highlights |
• | Empirical mode decomposition and wavelet transform are used as compression tools. |
• | Empirical mode decomposition provides significant components of ECG signal. |
• | Wavelet transform coefficients are quantized using dead-zone quantization. |
• | Transform coefficients are coded using run-length encoding. |
• | Reconstructed ECG signals are very much similar to original signals. |
Abstract |
Objective |
In health-care systems, compression is an essential tool to solve the storage and transmission problems. In this regard, this paper reports a new electrocardiogram (ECG) data compression scheme which employs sifting function based empirical mode decomposition (EMD) and discrete wavelet transform.
Method |
EMD based on sifting function is utilized to get the first intrinsic mode function (IMF). After EMD, the first IMF and four significant sifting functions are combined together. This combination is free from many irrelevant components of the signal. Discrete wavelet transform (DWT) with mother wavelet ‘bior4.4’ is applied to this combination. The transform coefficients obtained after DWT are passed through dead-zone quantization. It discards small transform coefficients lying around zero. Further, integer conversion of coefficients and run-length encoding are utilized to achieve a compressed form of ECG data.
Results |
Compression performance of the proposed scheme is evaluated using 48 ECG records of the MIT-BIH arrhythmia database. In the comparison of compression results, it is observed that the proposed method exhibits better performance than many recent ECG compressors. A mean opinion score test is also conducted to evaluate the true quality of the reconstructed ECG signals.
Conclusion |
The proposed scheme offers better compression performance with preserving the key features of the signal very well.
Le texte complet de cet article est disponible en PDF.Keywords : ECG, Empirical mode decomposition, Wavelet transform, Compression ratio, Quality score
Plan
Vol 42 - N° 1
P. 65-72 - février 2021 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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