Skip to main content

Univariate and Bivariate Empirical Mode Decomposition for Postural Stability Analysis


The aim of this paper was to compare empirical mode decomposition (EMD) and two new extended methods of EMD named complex empirical mode decomposition (complex-EMD) and bivariate empirical mode decomposition (bivariate-EMD). All methods were used to analyze stabilogram center of pressure (COP) time series. The two new methods are suitable to be applied to complex time series to extract complex intrinsic mode functions (IMFs) before the Hilbert transform is subsequently applied on the IMFs. The trace of the analytic IMF in the complex plane has a circular form, with each IMF having its own rotation frequency. The area of the circle and the average rotation frequency of IMFs represent efficient indicators of the postural stability status of subjects. Experimental results show the effectiveness of these indicators to identify differences in standing posture between groups.

Publisher note

To access the full article, please see PDF.

Author information



Corresponding author

Correspondence to Hassan Amoud.

Rights and permissions

Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reprints and Permissions

About this article

Cite this article

Amoud, H., Snoussi, H., Hewson, D. et al. Univariate and Bivariate Empirical Mode Decomposition for Postural Stability Analysis. EURASIP J. Adv. Signal Process. 2008, 657391 (2008).

Download citation


  • Information Technology
  • Stability Analysis
  • Quantum Information
  • Postural Stability
  • Empirical Mode Decomposition