Transformer-Guided Vision for Autonomous Drone Delivery: Integrating YOLOv8 and ViT for Obstacle Detection and Landing Zone Segmentation. - Sourav Mondal; Kamakhya Paul; Sana Sultana Pathan; Gopi Chand Perala; Venkata Karthik Dhulipudi (Innov. Syst. Softw. Eng., 2026)