Fig. 1. Black Goji berries

Fig. 1. Nitraria Tanggu

Fig. 2. (a) 232 reflectance spectral bands of black Gojiberries and Nitraria Tanggu; (b) Average spectra of black Gojiberries and Nitraria Tanggu

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

Fig. 4. 20 characteristic wavelength selected by SPA

Fig. 5. Identification results of black Gojiberries and nitraria Tanggu by SVM

Fig. 6. Identification results of black Gojiberries and nitraria Tanggu by ELM