一种基于移动像机的大型结构件形变监测方法

摘要

针对大型结构安全监测中测量设备多、分布复杂、价格昂贵等问题,提出一种基于摄像测量技术的移动式工业像机在线监测方法.通过不同视图之间的极线约束关系推导运动平台以及像机在不同时刻外参数的约束关系.利用简单数据融合方法将像机运动外参数与运动轨迹解算的像机外参数进行融合,达到自动在线测量像机外参数的目的,从而解出标识点的精确位置,实现测量过程的自动化.实验结果表明:提出的测量方法装置简单,精度较高,可以应用于大型复杂结构的在线形变安全监测.%A online deformation monitoring method utilizing a mobile digital camera and floating plat based on video metrics is proposed to resolve problem that there exist excessive measure equipment and high cost. Firstly, the epipolar geometry inhibition among different views is used to compute the extrinsic parameter restriction of plat and digital camera at different time. Then, it is fused to the extrinsic parameters calculated based on the plat track and the camera extrinsic parameters can be measured automatic. Finally, the position of marker point is measurement under the intrinsic and extrinsic parameters during different time. Experiments show that the proposed method has the advantage of simple measurement device and high precision, and it can be applied into online deformation monitoring for large-scale structure.