Keypoint detection and diameter estimation of cabbage (Brassica oleracea L.) heads under varying occlusion degrees via YOLOv8n-CK network - Jinming Zheng; Xiaochan Wang; Yinyan Shi; Xiaolei Zhang; Yao Wu; Dezhi Wang; Xuekai Huang; Yanxin Wang; Jihao Wang; Jianfei Zhang (Computers and Electronics in Agriculture, 2024)