The top plot showed the original time series, followed by the IMF series (IMF 1 to IMF 9), and the bottom plot represented the 'residual' series.
To determine the ghost map in this region, we also develop an optimization technique, which yields less noisy results than conventional IMF-based thresholding methods.
Utilizing fD max as threshold, the IMFs constituted with the required frequency components can be separated and the IMFs constituted with noise can be eliminated.
Utilizing fD max as threshold, the IMFs constituted with noise are eliminated with the EMD approach.
The Hurst exponent value is a key parameter in estimating the threshold, and the IMFs with h q) greater than the threshold are considered for reconstruction of the signal; the remaining IMFs constitute the scintillation components.
There are 25 IMFs decomposed from the original signal with the designed threshold and the first 10 IMFs are shown in Figure 11(a) and the reconstructed signal can be obtained that is shown in Figure 11(b).
Some authors propose a minimum threshold of 1.5% IMF for acceptable eating quality in fresh pork [ 3], while other studies suggest that levels of 2 to 3% IMF are required to ensure desirable eating quality [ 6].
These IMFs are soft-thresholded, yielding IMF1, , IM, which are thresholded versions of the original components.
By summing up the IMFs with H values below the threshold, we can obtain the amount of scintillation noise from the data.
