TABLE 6.
Experimental results of the feature set created by concatenating features from four architectures
| Dataset | Feature extractor | Classifier | Acc. (%) | SN (%) | SP (%) | PREC (%) | Time(s) |
|---|---|---|---|---|---|---|---|
| COVID‐19 image Dataset | AlexNet + EfficientNet‐b0 + NASNetLarge + Xception | LDA | 98.8 | 99.0 | 99.2 | 99.0 | 10.827 |
| SVM | 98.8 | 98.1 | 100 | 100 | 11.1 | ||
| KNN | 97.2 | 97.2 | 99.2 | 99.0 | 9.8717 | ||
| DT | 84.5 | 93.6 | 92.8 | 91.2 | 10.779 | ||
| NB | 98.0 | 97.2 | 100 | 100 | 28.869 | ||
| COVID‐19 Pneumonia Normal Chest X‐ray (PA) Dataset | AlexNet + EfficientNet‐b0 + NASNetLarge + Xception | LDA | 72.6 | 83.5 | 90.5 | 81.5 | 192.42 |
| SVM | 95.9 | 98.6 | 99.9 | 99.8 | 55.071 | ||
| KNN | 92.0 | 91.4 | 99.9 | 99.7 | 223.39 | ||
| DT | 84.8 | 86.5 | 93.9 | 87.6 | 82.697 | ||
| NB | 93.2 | 93.2 | 99.0 | 93.2 | 43.496 | ||
| COVID‐19 Radiography Database | AlexNet + EfficientNet‐b0 + NASNetLarge + Xception | LDA | 99.6 | 98.7 | 99.9 | 99.8 | 418.93 |
| SVM | 99.3 | 97.8 | 99.8 | 99.5 | 227.02 | ||
| KNN | 93.2 | 76.3 | 99.1 | 96.5 | 2195.9 | ||
| DT | 88.4 | 74.3 | 95.5 | 84.0 | 201.49 | ||
| NB | 91.1 | 92.5 | 94.8 | 84.9 | 102.12 |