Fig. 1. Rice borer holes of rice stem

Fig. 2. Hyperspectral image acquisition system

Fig. 3. Spectral reflectance curves of 120 samples

Fig. 4. The first five PC images

Fig. 5. PC3 spectral weight coefficient

Fig. 6. RGB images at 668.8 and 750 nm

Fig. 7. Flow chart of pest detection of rice borer based on principal component analysis characteristic band

Fig. 8. Hyperspectral reflectance curves of a single sample

Fig. 9. Optimal band iteration threshold segmentation image

Fig. 10. The results of wormhole extraction based on iterative threshold

Fig. 11. Flow chart of wormhole extraction method based on iterative threshold