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Illustration of edge effects on performance. Left: a saliency map of size 120 × 160 that consists of all 1’s except for a four-pixel-wide border of 0’s. Center: a saliency map of size 120 × 160 that consists of all 1’s except for an eight-pixel-wide border of 0’s. Right: the ROC curves of these two dummy saliency maps, as well as for a baseline saliency map (all 1’s). The ROC areas for these two curves are 0.62 and 0.73, respectively. (The baseline ROC area is 0.5.)
