Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (8): 1915-1926.DOI: 10.3969/j.issn.1004-1524.20221056

• Biosystems Engineering • Previous Articles     Next Articles

Near-infrared quantitative detection of fat in peeled Korean pine seeds based on manifold learning

QIU Xunchao1,2(), CAO Jun2,*(), ZHANG Yizhuo2   

  1. 1. Department of Computer Engineering, Harbin Finance University, Harbin 150030, China
    2. College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2022-07-17 Online:2023-08-25 Published:2023-08-29

Abstract:

Quantitative detection of fat in peeled Korean pine seeds is an important indicator of its edible and breeding value. In addition, near-infrared spectroscopy was used to detect nondestructively. Based on the result of standard normalized variate+first derivative+symlet4 (SNV+1st-Der+Sym4) pretreatment method, considering the traditional dimensionality reduction, principal components analysis (PCA) has some problems, such as insensitive to nonlinear complex structures and removing the linear correlation information between features completely. Isometric mapping (Isomap), locally linear embedding (LLE), modified locally linear embedding (MLLE), local tangent space alignment (LTSA) and Hessian based locally linear embedding (HLLE) were used to reduce dimensions separately. Taking the model which was established by partial least square (PLS) as the calibration model. Furthermore, ridge regression (Ridge), support vector regression (SVR) and extreme gradient boosting (XGBoost) were adopted to establish mathematical models, respectively. As shown by the results, the quality of the parameter optimization model established by MLLE+SVR was the best, and the optimized parameters were as follows: neighborhood number (neighbors) was 30 and dimension (components) was 16, and the mean value of mean squared error of validation (mean-MSEV) was 0.646 4, and the mean relative error (MRE) of test set was 0.999 2%. Therefore, the MLLE+SVR model can be well applied to the quantitative detection of fat in peeled Korean pine seeds.

Key words: peeled Korean pine seeds, fat, manifold learning, near-infrared spectroscopy

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