Fig. 3.

The expression of the differences in COVID-19 (a1-a3) and non−COVID-19 (b1-b3) images by the feature of "original_firstorder_Uniformity". Figure a(1) represents the lung of a 63-year-old male with fever, chest tightness, and anorexia for 9 days. CT manifested as bilateral involvement and multifocality. Figure a(2) represents the lungs of a 88-year-old male with anorexia for 6 days and fever for 2 days. CT manifestation indicates peripheral distribution, diffuseness, and mixed ground-glass opacity. Figure a(3) represents the lungs of a 53-year-old male with weakness and muscle aches for more than 10 days. CT manifestation included bilateral involvement, consolidation, and vascular thickening. Figure b(1) represents the lungs of a 29-year-old male with cough for 6 days. CT manifested as pneumonia lesions similar to the visual characteristics of Figure a(1) in the right lung. Figure b(2) represents the lungs of a 30-year-old male with cough and chest pain for 2 days. CT manifestation included bilateral involvement with multiple consolidation lesions. Figure b(3) represents the lungs of a 37-year-old female with a cough for 3 days. CT manifested as mixed ground-glass opacity, consolidation, and vascular thickening in the left lung.