Fig. 1. (a) NSCT filter; (b) schematic of ideal frequency decomposition; (c) schematic of three-level NSCT decomposition

Fig. 2. Flow chart of proposed algorithm

Fig. 3. Coarse and fine saliency maps. (a) Original images; (b) images in CIELAB space and their Itti saliency maps; (c) low-frequency sub-images; (d) MSR-enhanced low-frequency sub-images; (e) MSRCR-enhanced low-frequency sub-images; (f) fine saliency maps

Fig. 4. Comparison among original image and saliency maps by all methods. (a) Original images; (b) GB saliency maps; (c) SR saliency maps; (d) FT saliency maps; (e) HFT saliency maps; (f) WT saliency maps; (g) RC saliency maps; (h) ENT saliency maps; (i) binary maps of ENT salient region; (j) standard saliency maps

Fig. 5. P-R curves comparison among all methods. (a) MSRA-1000; (b) DUT-OMRON; (c) MSRA-10K

Fig. 6. F-measure comparison among all methods. (a) MSRA-1000; (b) DUT-OMRON; (c) MSRA-10K

Table 1. Running time for different algorithms