Table 9. Average performance of the build CNN models.

Scenario	Classes	Model	Results
I	Normal/COVID-19	CNN	Acc = 97.67%, Se = 100%, Sp = 95.45%
II	Normal/COVID-19/PNEUMONIA	CNN	Acc = 93.75%, Se = 100%, Sp = 95.24%

Results = Results obtain after model fine-tune and contrast enhancement in x-ray images, Acc = Accuracy, Se = Sensitivity, Sp = Specificity.