Cui-ling LIU, Shao-min WANG, Jing-zhu WU, Xiao-rong SUN. Study on Internal Quality Nondestructive Detection of Sunflower Seed Based on Terahertz Time-Domain Transmission Imaging Technology[J]. Spectroscopy and Spectral Analysis, 2020, 40(11): 3384
- Spectroscopy and Spectral Analysis
- Vol. 40, Issue 11, 3384 (2020)
Fig. 1. Sample of sunflower seeds
(a): Normal seed; (b): Damaged kernel; (c): Worm-eaten kernel; (d): Empty seed
(a): Normal seed; (b): Damaged kernel; (c): Worm-eaten kernel; (d): Empty seed
Fig. 2. Experimental apparatus
(a): Terahertz pulse spectrometer; (b): Terahertz transmission imaging attachment
(a): Terahertz pulse spectrometer; (b): Terahertz transmission imaging attachment
Fig. 3. Terahertz transmission images of four categories of sunflower seeds
(a): Normal seed; (b): Damaged kernel; (c): Worm-eaten kernel; (d): Empty seed
(a): Normal seed; (b): Damaged kernel; (c): Worm-eaten kernel; (d): Empty seed
Fig. 4. Time-domain spectra corresponding to different positions of sunflower seed
Fig. 5. Terahertz image filtering results of insect-eroded sunflower seeds
(a): 5×5 template mean filtering;(b): 5×5 template median filtering; (c): NML filtering
(a): 5×5 template mean filtering;(b): 5×5 template median filtering; (c): NML filtering
Fig. 6. Results of morphological filtering of insect-eroded sunflower seeds terahertz image
(a): Original image; (b): One dilatation result;(c): External gradient; (d): Morphological gradient
(a): Original image; (b): One dilatation result;(c): External gradient; (d): Morphological gradient
Fig. 7. Morphological filtering results of sunflower seed images with different states
(a): Normal seed; (b): Damaged kernel;(c): Worm-eaten kernel; (d): Empty seed
(a): Normal seed; (b): Damaged kernel;(c): Worm-eaten kernel; (d): Empty seed
Fig. 8. K-means image segmentation results of sunflower seed images with different states
(a): Normal seed; (b): Damaged kernel;(c): Worm-eaten kernel; (d): Empty seed
(a): Normal seed; (b): Damaged kernel;(c): Worm-eaten kernel; (d): Empty seed
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