Jinfu Zhang, Bin Tang, Jianxu Wang, Yanfei Chuan, Zourong Long, Qing Chen, Junfeng Miao, Linfeng Cai, Mingfu Zhao, Mi Zhou. Comparative Analysis of Characteristic Wavelength Screening of Apple Soluble Solids Based on Near-Infrared Spectroscopy[J]. Laser & Optoelectronics Progress, 2023, 60(17): 1730003
- Laser & Optoelectronics Progress
- Vol. 60, Issue 17, 1730003 (2023)
Fig. 1. Schematic diagram of the spectrum acquisition platform
Fig. 2. Original spectra of 120 samples
Fig. 3. Comparison of original and preprocessed spectra
Fig. 4. Flow chart of PLS modeling based on mutual information
Fig. 5. Relationship between number of PLS principal components and training sets R2 and MSE
Fig. 6. Full spectrum PLS analysis results
Fig. 7. Screening results of key variables based on CARS. (a) Reserved variables per run; (b) RMSECV of PLS model based on cars; (c) change of variable regression coefficient during each operation, and the asterisk indicates the lowest RMSECV
Fig. 8. Analysis of CARS-PLS results
Fig. 9. Analysis of MI-PLS results
Fig. 10. Selected variables
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Table 1. Statistics of SSC of 120 samples in the data sets
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Table 2. SSC prediction results of apple by PLS models using the variables obtained by different variable selection algorithms
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