Table 8.
Performance metrics of the proposed method based on SAE and SoftMax layer for the particular evaluation of each feature domain and the proposed fusion scheme.
| Material | Accuracy | Precision | Recall | F1 Score | |||||
|---|---|---|---|---|---|---|---|---|---|
| Training | Test | Training | Test | Training | Test | Training | Test | ||
| Metallic | Time | 0.98 | 0.97 | 0.99 | 0.98 | 0.99 | 0.97 | 0.99 | 0.97 |
| Frequency | 0.93 | 0.91 | 0.98 | 0.98 | 0.94 | 0.92 | 0.95 | 0.94 | |
| Time–Frequency | 0.95 | 0.96 | 0.97 | 0.98 | 0.97 | 0.97 | 0.97 | 0.97 | |
| Fusion scheme | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | |
| Ceramic | Time | 0.96 | 0.96 | 0.98 | 0.98 | 0.98 | 0.97 | 0.98 | 0.97 |
| Frequency | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Time–Frequency | 0.99 | 0.98 | 0.99 | 0.98 | 0.99 | 0.99 | 0.99 | 0.98 | |
| Fusion scheme | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Hybrid | Time | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 | 1 | 0.99 | 0.99 |
| Frequency | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Time–Frequency | 0.99 | 0.99 | 0.99 | 1 | 0.99 | 0.99 | 0.99 | 0.99 | |
| Fusion scheme | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |