Table 8.
Comparison of different preprocessing methods in Experiment1: Normal, COVID-19, and typical viral.
| Method | Performance Metrics (%) |
||||
|---|---|---|---|---|---|
| Sensitivity (Recall) | Precision (PPV) | F1-score | Accuracy | Average Rank | |
| No Preprocessing | 96.09 (5) | 95.89 (5) | 95.99 (5) | 96.40 (5) | 5.0 |
| Image Adjustment | 97.50 (2) | 97.57 (2) | 97.52 (2) | 97.52 (2) | 2.0 |
| Histogram Matching | 96.93 (4) | 96.64 (4) | 96.78 (4) | 97.01 (4) | 4.0 |
| Histogram Equalization | 97.42 (3) | 97.39 (3) | 97.39 (3) | 97.43 (3) | 3.0 |
| CLAHE | 99.42 (1) | 99.47 (1) | 99.45 (1) | 99.39 (1) | 1.0 |
*Bold numbers indicate the best performance.