Target object labeling method and system for three-dimensional image data and medium

The invention relates to a target object labeling method and system for three-dimensional image data and a medium, belongs to the technical field of dangerous goods security inspection, and solves the problem of inaccurate three-dimensional image labeling in the prior art. The target object marking method comprises the following steps: generating a marking frame in three-dimensional image data according to a projection angle corresponding to a maximum projection area, and moving the marking frame to generate a plurality of two-dimensional target projection images corresponding to the three-dimensional image data on a display screen; comparing a standard target object image with the plurality of two-dimensional target projection images one by one, and taking the central position of the marking frame corresponding to the two-dimensional target projection image with the highest similarity as the central position of the target object; and determining a three-dimensional area of the target object in the three-dime