Hongquan Qu, Xiang Ji, Zhiyong Sheng, Hongbin Qu, Ling Wang. Research and Application of Sample Entropy Feature Extraction Based on Local Mean Decomposition[J]. Laser & Optoelectronics Progress, 2022, 59(7): 0706004
- Laser & Optoelectronics Progress
- Vol. 59, Issue 7, 0706004 (2022)
Fig. 1. Flow chart of feature extraction and classification for optical fiber vibration signal
Fig. 2. Decomposition flow chart of LMD and EMD methods
Fig. 3. Time domain diagram and spectrogram of x(t). (a) Time domain diagram; (b) spectrogram
Fig. 4. Instantaneous amplitude and frequency obtained by different methods. (a) LMD method; (b) EMD method
Fig. 5. Decomposition results of different methods. (a) LMD method; (b) EMD method
Fig. 6. Two-dimensional feature distribution map of the signal
Fig. 7. Signal reconstructed by LMD method. (a) Car cross signal; (b) electric pick signal; (c) noise; (d) pickaxe signal
Fig. 8. Sample entropy and energy distribution of LMD. (a) Car cross signal; (b) electric pick signal; (c) noise; (d) pickaxe signal
Fig. 9. Flow chart of the classification and identification method
Fig. 10. Confusion matrices for different methods. (a) LMD method; (b) EMD method
Fig. 11. Optical fiber signal recognition accuracy of different methods
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