Fig. 1. Near infrared spectrometer (a), Aging test box (b), Electronic scale (c) and IN312-SHD0 measuring cup (d)

Fig. 2. Spectra of 402 corn seed samples

Fig. 3. Spectra after SG-SNV pretreatment

Fig. 4. Selected variables of SPA with assigning value 20 to the number of variables selected

Fig. 5. Selected variables of SPA_sa (a) and the change of RMSECV with the setting number of selected variables in SPA_sa (b)

Fig. 6. Distribution of MIV values of full spectrum data

Fig. 7. MIV_opt pre-dimensionality reduction
(a): Number of selected wavelengths varies with MIV relative distance ratio;(b): Prediction accuracy varies with MIV relative distance ratio

Fig. 8. The distribution of wavelengths selected by MIV_opt-SPA_sa