This invention proposes a method and
system for detecting missing weld points on vehicle bodies based on 3D vision and
global matching, belonging to the field of image recognition technology. The method includes: determining the transformation relationship between the camera coordinate
system and the vehicle body coordinate
system through calibration; at each observation position, a 3D camera acquires an image I containing a frame of 2D texture and the corresponding 3D data; inputting the acquired image I into a pre-trained
deep learning object detection model, outputting the bounding box information (u, v, w, h) for each weld point; for each detected weld point, calculating the set S of the weld point's 3D coordinates in the vehicle body coordinate system. det For the theoretical solder joint
library S cad Each theoretical solder joint P in cad,i In set S det The invention employs a "detect first, match later" strategy, which does not rely on the precise projection of the theoretical position, thus reducing the requirements for the positioning accuracy of the
production line tooling fixtures and conveying system.