Leaf Image Segmentation in Urochloa Pastures: A Comparative Analysis of Preprocessing Strategies Using Smartphone Imagery. - Chambingo, Isabel Felizardo; Bertin, Matheus de Godoi; Silupu, Wilson Manuel Castro; Baesso, Murilo Mesquita; Pereira, Lilian Elgalise Techio; Tech, Adriano Rogério Bruno (AgriEngineering, 2026)