Fig. 1. Camellia fruit and camellia seed sample diagrams. (a) Ripe amellia fruit; (b) camellia seeds after removing the shell of camellia; (c) camellia seed slice sample for mid-infrared spectroscopy test; (d) compressed samples of camellia seeds mixed with polyethylene powder for far-infrared spectroscopy

Fig. 2. Mid-infrared absorption spectra of camellia seeds with different oil contents

Fig. 3. Far-infrared absorption spectra of camellia seeds with different oil contents

Fig. 4. Optimization results of c and g parameters of SVM model based on intermediate data fusion. (a) Three-dimensional view optimized by GS algorithm;(b) contour map optimized by GS algorithm; (c) accuracy curve optimized by GA algorithm;(d) accuracy curve optimized by PSO algorithm

Table 1. Oil content of camellia seed

Table 2. Prediction results of SVM model under different feature extraction methods of mid-infrared and far-infrared spectra

Table 3. Comparison of classification results of optimized SVM model

Table 4. Results of SVM model after parameter optimization based on intermediate data fusion