A UAV Vision-based Deformation Monitoring Method With 3D Scale Constraints

Aiming at the problem of the scale difference between the measurement area model and the real model caused by low-quality images and low-precision control points in the vi-sion three-dimensional deformation monitoring by unmanned aerial vehicles (UAVs), which affects the accuracy of deformation monitoring, the paper develops a spatial 3D scale used to provide high-precision scale information, and puts forward a 3D scale-constrained UAV vision deformation monitoring method, which improves the ac-curacy of deformation monitoring in a wide range of measurement areas. The experi-mental results show that, compared with the monitoring method using only control points as constraints, the method in this paper has an improvement rate of 38.6% and 48.1% in monitoring accuracy in the horizontal and elevation directions in the four-phase UAV operation, which verifies the validity and reliability of the UAV-vision deformation monitoring method with three-dimensional scale constraints.