Research On Acquisition Method Of Bridge Contour Deformation Based On Feature Matching Of Sequence Image

Aiming at the problems of low efficiency,poor accuracy and lack of quantitative scientific basis for frequent bridge safety inspection,the use of digital images for structural deformation detection with high precision is the prospect of health monitoring of bridges.Due to the large range of bridge scenes,it is difficult to effectively improve the image resolution and detection accuracy by directly acquiring the global image of the bridge.In order to realize the image detection of the bridge deformation,this paper relies on the National Natural Science Foundation of China,which is hosted by the instructor.This paper analyzes “Research on the Method of Obtaining the Bridge Deformation and Deducing the Structural State Based on the Differential Analysis of Image Contour(51778094)”,and studies the acquisition method of bridge profile deformation based on sequence image feature matching in steel-concrete composite test beam.The main research contents are as follows:1.To study the feasibility of using the method of sequence image feature matching to obtain the bridge contour,explore a new method of bridge structure detection using digital image and image processing technology,and calculate the steel truss with a span of 7.0m in the laboratory.The steel-concrete composite combined test beam is used to carry out image acquisition of moving photographic sequence images under various damage conditions and displacement data acquisition experiments of traditional dial gauges.2.For the beam body sequence image data under the damage condition,combined with the relevant theoretical knowledge of the image stitching algorithm,by combining the improved SURF algorithm based on the basic point and the basic direction with the image sequence automatic sorting method based on the phase correlation method,The acquired sequence images are spliced to form a holographic image.3.According to the theory of mathematical morphology and image informatics,the edge extraction of holographic image is carried out by Matlab software,and the cubic B-spline curve theory is used to obtain the holographic relative deformation curve under the damage loading conditions of the experiment.The obtained relative position deformation value of the measuring point and the relative deformation value based on the dial gauge are basically stable,and have good precision and reliability.4.According to the monitoring of the G42 Hurong high-speed line Yinwotan Bridge,the successively acquired sequence images are spliced to obtain the pixel-level edge contours,and the relative deformation values of the bridge edge contours are obtained by the stacking analysis,which is compared with the three-dimensional laser scanning.The deformation value is relatively stable to meet the current engineering application requirements.