Laser & Optoelectronics Progress, Volume. 60, Issue 10, 1030003(2023)
Terahertz Time-Domain Spectral Pattern Recognition for Weight Loss Drugs Based on Feature Fusion
Fig. 1. Original spectra of seven weight loss drugs
Fig. 2. Characteristic peak interval of seven weight loss drugs
Fig. 3. Flow chart of random forest model
Fig. 4. Recognition accuracy of PSO-LSSVM under different feature fusion methods for seven weight loss drugs. (a) Original spectra; (b) feature fusion spectra after Hilbert transform; (c) feature fusion spectra after SNV+DT transform; (d) feature fusion spectra after FFT low-pass filter transform; (e) feature fusion spectra after Butterworth low-pass filter transform
Fig. 5. Confusion matrix of random forest model under different feature fusion methods for seven weight loss drugs. (a) Original spectra; (b) Hilbert transform; (c) SNV+DT transform; (d) FFT low-pass filter transform; (e) Butterworth low-pass filter transform
Fig. 6. Accuracy of random forest model under different feature fusion methods for seven weight loss drugs. (a) Original spectra; (b) Hilbert transform; (c) SNV+DT transform; (d) FFT low-pass filter transform; (e) Butterworth low-pass filter transform
Fig. 7. Classification and recognition accuracy of PSO-LSSVM and RF. (a) PSO-LSSVM; (b) RF
Fig. 8. THz time-domain spectrum of sample S-1
Fig. 9. THz time-domain spectrum of sample S-2
Fig. 10. THz time-domain spectrum of sample S-3
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Zhaowei Jie, Zhiyu Wang, Jifen Wang, Yijian Sun, Zhen Zhang, Wenping Li, Yiqing Kong. Terahertz Time-Domain Spectral Pattern Recognition for Weight Loss Drugs Based on Feature Fusion[J]. Laser & Optoelectronics Progress, 2023, 60(10): 1030003
Category: Spectroscopy
Received: Feb. 21, 2022
Accepted: Apr. 19, 2022
Published Online: May. 17, 2023
The Author Email: Wang Jifen (wangjifen58@126.com)