Fig. 1. Hyperspectral image collection

Fig. 2. Overall research plan

Fig. 3. Segmentation diagram
(a): Segmentation of region of interest and background region; (b): Spectra of region of interest and background region; (c): Mask

Fig. 4. CARS-SPA algorithm
(a): Feature band extracted by CARS algorithm;(b): Feature band extracted by CARS-SPA algorithm

Fig. 5. The choice of grafting difference information
(a): Average spectra of grafted survival and non-viable seedlings on the 7th day; (b): Average absorption spectra of grafted survival and non-viable seedlings on the 7th day; (c): Location of the extracted feature wavelengths using DIS-CARS-SPA algorithm

Table 1. Two classification results of grafted survival seedlings and non-viable seedlings on the same day based on SVM constructed by different pretreatments

Table 2. Two classification results of survival/non-viable seedlings grafted on different days using SVM constructed based on SNV-SG-SD pretreatment

Table 3. Fourteen classification results of grafted survival/non-viable seedlings by SVM based on feature extraction after SNV-SG-SD preprocessing

Table 4. Parameter selection of SVM model based on different optimization algorithms

Table 5. Parameter selection of SVM model based on different kernel functions