Visual positioning method and system for improving assembling precision of body-in-white top cover assembly

The invention relates to the technical field of vehicle production, in particular to a visual positioning method and system for improving the assembling precision of a body-in-white top cover assembly. The method comprises the following steps: building a body-in-white top cover assembly model and a workbench model, and placing the body-in-white top cover assembly model on the workbench model to obtain a reference verification model; establishing a three-dimensional coordinate system based on the reference verification model, and parameterizing positioning point marks and contour marks in the reference verification model; image information of the body-in-white top cover assembly and the workbench in the actual assembling process is collected, and whether deviation exists in the body-in-white top cover assembly in the actual assembling process or not is judged according to fitting comparison of the image information and the reference verification model; according to the method, the feature mark points are compa