Fig. 1. Wild black Goji berries

Fig. 1. Wild black Goji berries after removing the stalks

Fig. 2. Average reflectance spectra of wild and cultivated black Goji berries

Fig. 3. Changed RMSE with the number of characteristic wavelength in SPA

Fig. 4. Identification results of black Goji berries by SVM

Fig. 5. Identification results of black Goji berries by ELM

Fig. 6. Identification results of black Goji berries by RF