Lu WANG, Hai-ou GUAN, Wei-kai LI, Zhi-chao ZHANG, Ming ZHENG, Song YU, Yu-long HOU. Analysis and Detection Method of NIR Spectral Characteristics of Kidney Bean Canopy Under Saline-Alkali Stress[J]. Spectroscopy and Spectral Analysis, 2020, 40(10): 3271
- Spectroscopy and Spectral Analysis
- Vol. 40, Issue 10, 3271 (2020)
Fig. 1. Kidney bean experiment scene
(a): Hydroponics of kidney bean live; (b): Obtaining spectral curve of kidney bean by near infrared spectrometer
(a): Hydroponics of kidney bean live; (b): Obtaining spectral curve of kidney bean by near infrared spectrometer
Fig. 2. Distribution of mahalanobis distances of 524 kidney bean samples
Fig. 3. Near infrared spectra of kidney bean samples
Fig. 4. Average spectral absorbance curves of 7 types of kidney bean samples
Fig. 5. Near infrared spectra of kidney bean canopy pretreated by DT
Fig. 6. Extraction of characteristic wavelength by CARS
Fig. 7. Extraction of characteristic wavelength by SPA
(a): Number of filter variables; (b): Distribution of characteristic wavelengths
(a): Number of filter variables; (b): Distribution of characteristic wavelengths
Fig. 8. Contrast of convergence speed of networks
(a): BP neural network; (b): RBF neural network
(a): BP neural network; (b): RBF neural network
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Table 1. The salt-alkali stress pretreatment model obtained by PLSR and PCR analysis
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Table 2. Comparison of three modeling methods
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Table 3. The performance index of salt and alkali stress detection model of kidney bean
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