Fig. 1. Schematic of hyperspectral imaging device

Fig. 2. Collected hyperspectral images of typical Korla pear samples at different wavelengths. (a) 400 nm; (b) 494 nm; (c) 587 nm; (d) 681 nm; (e) 774 nm; (f) 868 nm

Fig. 3. Spectra of Korla pear surfaces and background areas. (a) Spectra; (b) average value and variance of spectral curves

Fig. 4. Hyperspectral images and their histogram plots at three wavelengths. (a) 433 nm; (b) 631 nm; (c) 863 nm

Fig. 5. Results of OTSU threshold segmentation and morphological analysis for hyperspectral images at three wavelengths. (a) 433 nm; (b) 631 nm; (c) 863 nm

Fig. 6. The first six primary component images obtained by PCA. (a) PC 1; (b) PC 2; (c) PC 3; (d) PC 4; (e) PC 5; (f) PC 6

Fig. 7. Results of the ratio enhancement and image segmentation. (a) Result of ratio enhancement; (b) result of threshold segmentation; (c) result of morphological calculation