Key Parameters for Maize Leaf Moisture Measurement Using NIR Camera With Filters Based on Hyperspectral Data

Peng-cheng LI; Han LIU; Long-lian ZHAO; Jun-hui LI

doi:10.3964/j.issn.1000-0593(2021)10-3184-05

Spectroscopy and Spectral Analysis, Volume. 41, Issue 10, 3184(2021)

Key Parameters for Maize Leaf Moisture Measurement Using NIR Camera With Filters Based on Hyperspectral Data

Peng-cheng LI^*, Han LIU^{1; 2;}, Long-lian ZHAO^{1; 2;}, and Jun-hui LI^{1; 2; *;}

Author Affiliations

1. College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China

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Figures & Tables(5)

Fig. 1. Scatter plots of moisture reference and predicted values for calibration set (a) and prediction set (b) with 25 nm bandwidth filter

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Table 1. Result of stepwise regression model
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Table 1. Result of stepwise regression model
Model Feature wavelength R² RMSE
1 wavelength 1 151 0.935 1.374
2 wavelengths 1 151, 1 403 0.962 1.074
3 wavelengths 1 151, 1 403, 1 492 0.976 0.815
4 wavelengths 1 151, 1 403, 1 492, 1 471 0.980 0.756

Table 2. Results of modeling and prediction based on feature wavelengths
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Table 2. Results of modeling and prediction based on feature wavelengths
Wavelength Calibration set Predicton set
R² RMSE R² RMSE
1 151, 1 403 0.966 1.276 0.960 1.324
1 150, 1 400 0.965 1.301 0.954 1.394

Table 3. Modeling results for different bandwidths

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Table 3. Modeling results for different bandwidths

Bandwidth	Linear regression equation	R²	RMSE
10	y=226.276+292.372x_{1 150}+62.691x_{1 400}	0.961	1.343
25	y=237.591+293.908x_{1 150}+75.411x_{1 400}	0.966	1.253
50	y=275.305+315.264x_{1 150}+85.431x_{1 400}	0.964	1.286
100	y=261.361+269.392x_{1 150}+126.182x_{1 400}	0.961	1.335
200	y=258.446+214.797x_{1 150}+205.532x_{1 400}	0.948	1.548
300	y=204.405-240.874x_{1 150}+762.535x_{1 400}	0.924	1.875

Table 4. The effects of central wavelength drift on model prediction errors for 25 nm bandwidth filter centered at 1 150 and 1 400 nm
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Table 4. The effects of central wavelength drift on model prediction errors for 25 nm bandwidth filter centered at 1 150 and 1 400 nm
Drift 0 0.01 0.03 0.05 0.07 0.09 0.1 0.2 0.3 0.4 0.5
RMSE 1.253 1.255 1.267 1.292 1.327 1.374 1.400 1.769 2.254 2.79 3.368

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Peng-cheng LI, Han LIU, Long-lian ZHAO, Jun-hui LI. Key Parameters for Maize Leaf Moisture Measurement Using NIR Camera With Filters Based on Hyperspectral Data[J]. Spectroscopy and Spectral Analysis, 2021, 41(10): 3184

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