Modifying images before evaluation using Average Drop/Increase in Confidence

[NgKhaiPhu]

Hi, I have some questions regarding the Average Drop/Increase in Confidence metric in section 4.2.

In this experiment, rather than do point-wise multiplication with the original generated saliency map, we slightly modify by limiting the number of positive pixels in the saliency map (50% of pixels of the image are muted in our experiment).

• Do you select 50% of the pixels randomly for every image?
• Is it 50% of the input image, or 50% of the overlayed image produced by the multiplication?