Fig. 5.

A) Average of correctly classified scans of the test set (left) with superimposition of the Grad-CAM activation maps (middle) and the class-discriminative regions on a white background (right). Grad-CAM activation map shows the class-discriminative regions and the red color corresponds to higher relevance to the CNN’s output. The approximate position of the olfactory bulb is indicated by the white ovals. B) Individual example of one scan and the corresponding Grad-CAM activation map. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)