From object difficulty to image scoring: A strategy for active learning in object detection. - Duc Tai Phan; Nhut Minh Nguyen; Khang Phuc Nguyen; Phuong-Nam Tran 001; Nhat Truong Pham; Linh Le; Choong Seon Hong; Duc Ngoc Minh Dang (Knowl. Based Syst., 2026)