Method for visually detecting quality of body-in-white surface product through virtual oilstone

The invention relates to a method for visually detecting the quality of a body-in-white surface product through virtual oilstones. The method comprises the steps that 3D data of the surface of a to-be-detected automobile covering part/body-in-white surface is collected; a standard polishing direction is generated based on the to-be-detected automobile covering part/body-in-white surface 3D data; generating a standard surface direction; performing cyclic surface quality evaluation; generating a local plane; generating a local section; generating a local section line; and local quality evaluation: fitting a local interface line according to the local section line, calculating the deviation between the current position and the local section line, determining whether the current point is a defect according to the deviation and the process parameters, and determining the defect level according to the deviation value. According to the method, the surface quality of the body in white is automatically analyzed based