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. 2018 Jun 22;9(4):611–629. doi: 10.1007/s13244-018-0639-9

Fig. 14.

Fig. 14

An example of a class activation map (CAM) [58]. A CNN network trained on ImageNet classified the left image as a “bridge pier”. A heatmap for the category of “bridge pier”, generated by a method called Grad-CAM [59], is superimposed (right image), which indicates the discriminative image regions used by the CNN for the classification