数字摄影技术观测钢结构震动变形的研究

为了实现对钢结构在震动状态下的实时监测，本文采用数字摄影技术对钢结构进行变形观测。利用经过直接线性变换法检定的多个数码相机，对未施加、施加荷载的钢结构进行连续摄影捕捉瞬间变形信息，通过建立Hough变换数学模型对圆形标志进行识别与定位得到变形点的影像坐标值，对该坐标值进行处理并绘制变形曲线，监测精度达到3/1 000。实验结果表明，利用该项技术能够做到多点、瞬间观测，捕捉瞬间变形信息，且监测精度满足要求。

Steel structure vibration deformation observation with digital photography technology

To implement real time monitoring for steel structure of vibration state,we employ digital photography technology to observe deformed steel structure.We capture instantaneous continuous deformation information for loaded and unloaded steel structures with multiple direct linear transformation method calibrated digital cameras. We further recognize and localize circular marks through Hough transform mathematical model and get image coordinates of a deformation point.The image coordinates are processed and drew into a deformation curve whose observation accuracy can reach 3/1 000. Experimental results show that we can achieve multi points and instantaneous observation by this technology, and can capture instantaneous deformation information.The observation precision can also satisfy the requirement of structural deformation observation.