As for rivet flatness measuring

the measurement methods using traditional gage measurement or non-contact point cloud scanning have disadvantages such as large limitations

long preparation periods and difficult data processing. In response to the above problems

this paper proposes a method for measuring the flatness of rivets based on binocular multi-line structured light. Firstly

binocular matching and reconstruction are performed on the structured light image collected by the binocular system

and the measured coordinate system is extracted and fitted. Next

discrete point screening proportional coefficient is introduced to optimize the fitting accuracy of local skin plane and then the discrete point screening scale factor is introduced to further optimize the fitting accuracy of the local skin plane

and finally it is substituted into the rivet flatness measurement model to perform calculations to obtain results. Compared with the traditional contact measurement and point cloud scanning

this method saves a lot of time for point cloud data processing and improves the measurement efficiency

and can complete the detection task of narrow cavity such as the aircraft inlet by mechanical arm equipped with a small measurement terminal

which reduces limitations. The experimental results show that this method is applicable to both concave and convex features of the rivet head

and the maximum measurement error of rivet flatness is less than 0.03mm

which meets the requirements of visual measurement of rivet flatness