|Refs., Year||Database||Signal for FE, Segment length||Method description||Feature||Limitation||Key Findings|
|, 2007||MITDB, CUDB, AHA||Stand-alone ECG, 8 s||Counting number of boxes on a grid filled by ECG and its delay signals.||Phase space reconstruction.||
Phase space reconstruction parameter and a threshold.|
VF and NSH signals show irregular and regular behaviors.
|, 2009||MITDB, CUDB||Stand-alone ECG, 8 s||Assessment of the proportion of time in which the ECG signal is above a certain threshold.||Threshold crossing sample count.||
Threshold crossing sample count parameter and a threshold.|
The time in which VF signal remains outside the threshold is larger than that in which NSH signal does.
|, 2010||MITDB, CUDB, VFDB||Stand-alone ECG and intrinsic mode functions using EMD, 8 s||
Calculation of mean absolute value of the signal for SH/NSH rhythm classification.|
Calculation of differences between ECG and first 2 intrinsic mode functions.
Normalized mean absolute value for VF/VT classification.
|Mean absolute value and normalized mean absolute value||
Requirement of 2 algorithms.
SH signal hardly goes through the baseline and low absolute amplitude of the NSH signal for most of the time.|
Similarity between VF signal and its first 2 intrinsic mode functions.
|, 2011||MITDB, CUDB, VFDB||Stand-alone ECG and intrinsic mode functions using EMD, 8 s||Measurement of correlation between ECG signal and its first intrinsic mode function, residual using the angles to form a complex decision parameter.||Complex decision parameter||
Complex decision parameter and a threshold.|
Correlation between ECG signal and its first intrinsic mode function and residual.
|, 2012||CUDB, NSRDB||Stand-alone ECG, 4 s||
Extraction of 3 features using semantic mining algorithm.|
Construction of thesholds based on ANOVA model.
Semantic mining algorithm for feature extraction.|
Analysis model for threshold construction.
|, 2012||CUDB, VFDB||Stand-alone ECG and intrinsic mode functions using EMD, 10 s||
Intrinsic mode function with EMD.|
Approximate entropy of first intrinsic mode function.
Consideration of first intrinsic mode function.|
|Approximate entropy threshold.|