Table 5.
The confusion matrices and classification accuracies produced by normalized two-stage VIs and single-date VIs with the PLS-DA method.
| Predicted Class | Healthy Rice | Rice Dwarf | Rice Blast | Glume Blight | User’s Accuracy (%) | Overall Accuracy (%) | Kappa Coefficient |
|---|---|---|---|---|---|---|---|
| Normalized two-stage VIs | |||||||
| Healthy rice | 54 | 0 | 6 | 2 | 87.1 | 75.62 | 0.47 |
| Rice dwarf | 4 | 60 | 5 | 9 | 76.92 | ||
| Rice blast | 11 | 4 | 48 | 5 | 70.59 | ||
| Glume blight | 5 | 8 | 2 | 27 | 64.29 | ||
| Producer’s accuracy (%) | 72.97 | 83.33 | 78.69 | 62.79 | |||
| single-date VIs | |||||||
| Healthy rice | 47 | 3 | 8 | 4 | 75.81 | 61.67 | 0.27 |
| Rice dwarf | 8 | 48 | 5 | 17 | 61.54 | ||
| Rice blast | 16 | 6 | 39 | 7 | 57.35 | ||
| Glume blight | 7 | 11 | 4 | 20 | 47.62 | ||
| Producer’s accuracy (%) | 60.26 | 70.59 | 69.64 | 41.67 |