Algorithm 2 Separation algorithm of YOLO Processing Module

Input: An image of touching-pigs Output: An image of individually separated pigs // BB generation Generate BBs by YOLO // BB evaluation Set RoI Check BB size, boundary, and coverage conditions Determine useful BBs If the number of useful BBs is 0   Exit this function and go to Image Processing Module // Segmentation using useful BBsConnect (two points with one or two useful BBs) If the number of useful BBs is one and the number of generated boundary lines is two   Exit this function and go to Image Processing Module // Segmentation quality evaluation Check segmentation length and size conditions If conditions are not satisfied,   Exit this function and go to Image Processing Module Return;