from single channel and two-channel data
DESCRIPTION
Combining EMD with ICA for Extracting Independent Sources. from Single Channel and Two-Channel Data. B. Mijović M. De Vos I. Gligorijević S. Van Huffel. 32nd Annual International Conference of the IEEE EMBS. Jain-De Le. 3. 2. 1. 4. RESULTS. METHODS. INTRODUCTION. - PowerPoint PPT PresentationTRANSCRIPT
from Single Channel and Two-Channel Data
32nd Annual International Conference of the IEEE EMBS32nd Annual International Conference of the IEEE EMBS
Combining EMD with ICA for Extracting Independent Sources
B. Mijović M. De Vos I. Gligorijević S. Van Huffel
Jain-De LeJain-De Le
OUTLINE
RESULTS3
METHODS2
INTRODUCTION1
CONCLUSION4
INTRODUCTION
ICA
The number of channels is larger than or equal to the number of sources
Undetermined ICA
The number of channels is smaller than or equal to the number of sources
Single Channel ICA (SCICA)
Wavelet-ICA (WICA)
EMD-ICA
INTRODUCTION
SCICA
Drawbacks• Assumes stationary sources
• The sources are assumed to be disjoint in the frequency domain
WICA
A wavelet transform is used to expand a 1D signal into 2D by dividing it into its frequency subbands
Wavelet transform has been used only for denoising
METHODS
Single Channel EMD-ICA
Signal is decomposed with EMD into a set of IMFs
Perform the FastICA algorithm to the IMFs and derive the corresponding mixing matrix A (y=Ax) and independent components
Select independent components of interest and multiply it with mixing matrix A to back-reconstruct its appearance in the IMFs set
Sum over all the newly derived IMFs to reconstruct the appearance of the source in the original signal
METHODS
Two-channel EMD-ICA
Perform the Complex EMD
perform the Singular Value Decomposition (SVD)
Merging both sets of reduced IMFs
Applied ICA
Reversible
RESULTS
原始混和信號
(上 )ECG artifact 訊號(下 )Cleaned EMG 訊號
Single Channel EMD-ICA
RESULTS
RESULTS
T1
Seizure event
Eye artifact
Muscle activity
Single Channel EMD-ICA
RESULTS
將 T1與 F4作 FastICA之結果
將 T1與 F4作 Two-channel EMD-ICA之結果
CONCLUSION
This method is capable of extracting more sources than channels recorded