结构动位移测试的计算机视觉方法实现

Computer Vision Approach for Structural Dynamic Displacement Measurement

基于计算机视觉原理,采用相机参数标定、图像跟踪和三维点重构技术,建立了以普通消费级相机为测试手段的结构动位移测试方法.通过简谐振动、悬臂梁自由振动和框架模型振动台试验验证了该方法的准确性和适用性.结果表明:基于计算机视觉的动位移测试方法是对目前其他传统测试方法的很好补充.

Based on the computer vision theorem, this study uses off-the shelf cameras to measure structural dynamic displacement by the technique of camera coefficients calibration, image point tracking, and three dimensional point reconstruction. To validate the proposed technique, the tests of sinusoidal motion of a point, free vibration of a cantilever beam, and a three-story building model under earthquake excitation, are performed. Results show that the proposed technique has the capability of accurate displacement measurement and the wide future of engineering application, which is shown to be a good complement to the traditional sensors with the advantages of 3D and multi-point measurement, non-contact type, more flexibility, and low cost.