Large-scale place displacement monitoring method, device and system

The invention relates to the technical field of building displacement measurement, in particular to a large place displacement monitoring method, device and system, and the method comprises the steps: collecting a laser spot image, and selecting an initial laser spot image; according to the gray values of the pixel points in the laser spot image and the distance between the pixel points, obtaining the center-of-circle symmetry similarity, and establishing a center-of-circle symmetry similarity set of the pixel points; obtaining the level similarity of the pixel points according to the center symmetry similarity set of the pixel points; adjusting filtering parameters of the pixel points are obtained, the adjusting filtering parameters of the pixel points serve as values of the filtering parameters, denoising is conducted on the laser spot image through a non-local average algorithm, a first laser spot image is obtained, and displacement monitoring of the building is determined to be achieved according to the f