Libo Rao, Tao Pang, Ranshi Ji, Xiaoyan Chen, Jie Zhang. Firmness Detection for Apples Based on Hyperspectral Imaging Technology Combined with Stack Autoencoder-Extreme Learning Machine Method[J]. Laser & Optoelectronics Progress, 2019, 56(11): 113001
- Laser & Optoelectronics Progress
- Vol. 56, Issue 11, 113001 (2019)
Fig. 1. Structural diagram of hyperspectral imaging system
Fig. 2. Original spectrum of pixel points
Fig. 3. Basic network structure of ELM
Fig. 4. Network structures of basic auto-encoder and SAE-ELM. (a) Basic auto-encoder; (b) SAE-ELM
Fig. 5. Flow chart of training in SAE-ELM
Fig. 6. Scatter plots of prediction and measurements for samples in calibration set and prediction set.(a) SAE-ELM (18); (b) ELM
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Table 1. Statistics of apple firmness in calibration set and prediction set
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Table 2. Calibration and prediction results of apple firmness using ELM and SAE-ELM
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