Retinal Vessel Segmentation Based on a Lightweight U-Net and Reverse Attention. - Hernandez-Gutierrez, Fernando Daniel; Avina-Bravo, Eli Gabriel; Ibarra-Manzano, Mario Alberto; Ruiz-Pinales, Jose; Ovalle-Magallanes, Emmanuel; Avina-Cervantes, Juan Gabriel (Mathematics (2227-7390), 2025)