Shortwave near infrared (SWNIR) and long wave near infrared (LWNIR) spectroscopy with a novel color
compensation method were compared to predict soluble solids content of apple. Linear and nonlinear
regression models were considered. Eventually, independent component analysis-support vector
machine (ICA-SVM) models proved to be superior to other nonlinear models. Rp was 0.9398 and RMSEP
was 0.3870% for the optimal model of SWNIR, while Rp was 0.9455 and RMSEP was 0.3691% for that of
LWNIR. Moreover, the results showed that color compensation could significantly improve the prediction
performance of SWNIR model. Our work implies that SWNIR with color compensation has an obvious
prospect in practical industrial use for real-time monitoring apple quality.
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