Yuanzhe Chen, Qiaohua Wang, Sheng Gao, Lu Mei. Nondestructive Testing Model for Textural Quality of Freshwater Fish in Storage Using Near-Infrared Spectroscopy[J]. Laser & Optoelectronics Progress, 2021, 58(12): 1230001
- Laser & Optoelectronics Progress
- Vol. 58, Issue 12, 1230001 (2021)
Fig. 1. Absorbance curves of fish for different storage time
Fig. 2. Dimensionless textural index versus storage time
Fig. 3. Raw spectra of samples and spectra after S-G pretreatment. (a) Raw spectra; (b) spectra after S-G pretreatment
Fig. 4. Selection of characteristic wavelengths by CARS-PLS model.(a) Numbers of sampled variables;(b) RMSECV; (c) regression coefficients path
Fig. 5. Variation of model RMSE and selection of characteristic wavelengths. (a) Variation of RMSE; (b) selection of characteristic wavelengths
Fig. 6. Scatter plot of predicted and measured values of sample hardness
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Table 1. Data statistics of partitioning sample sets by SPXY algorithm
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Table 2. Results of PLSR model established by the method of primary characteristic wavelength extraction
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Table 3. Secondary characteristic wavelength extracted by CARS and SPA algorithms
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Table 4. Results of PLSR model based on quadratic characteristic wavelength extraction method
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