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Method partially based on the excellent work described in:
 Qin, Xuebin, et al. "U2-Net: Going deeper with nested U-structure for salient object detection." Pattern Recognition 106 (2020): 107404
 Gupta, Ashish Kumar, et al. "Salient object detection techniques in computer vision—A survey." Entropy 22.10 (2020): 1174.