基于数字图像处理技术的多点动态位移监测  

Monitoring multi-dynamic displacements by digital image processing technology

作　　者：李鹏辉[1,2] 赵文光[1,2] 朱宏平[1,2] 文银平[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点实验室,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2011年第2期80-84,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50925828)

摘　　要：为了解决传统位移测量难以找到参考点、动态采集数据量大和多路同步难以实现的困难,开发了基于数字图像处理技术的多点动态位移测量系统.采用基于区域生长的曲面拟合标定方法和窗口形心跟踪算法,确定物空间与像空间坐标系之间的对应关系,通过比较形心处像素变化得到位移.采用磁盘阵列和同步信号发生器保证海量数据处理和多路相机之间的同步.对振动台上的4层钢框架结构进行了动态位移监测,结果表明:系统可以实现多路动态二维位移的同步采集和处理,位移精度达到0.1mm,同步精度为10ms.In traditional multi-channel dynamic displacement measurement, selecting the reference points, collecting massive data dynamically, and implementing multi-channal synchronization are difficult. Thus, multi-point dynamic displacement measurement system was developed by digital image processing technology. The automatic calibration method based on region growing and surface fitting and window-centroid tracking algorithm were applied to determine the corresponding relationship between the object space and pixel coordinate system. The displacement data was acquired by comparing the change of the centroid pixel. The disk arrays and synchronization signal generator were used to ensure massive data processing and multi-channel synchronization between the cameras. The dynamic displacement of four-layer steel frame structure was monitored on the shaking table. The results show the system can achieve the synchronous acquisition and processing of multi-channel 2D dynamic dis- placements with a displacement accuracy of 0.1 mm and synchronization accuracy of 10 ms.

关 键 词：图像处理 结构健康监测 标定 多点动态位移 钢框架 

分 类 号：TU198.3[建筑科学—建筑理论] TU317