用数码相机测量斜拉桥拉索模型的变形  

Measurement of stay cable model deformation of sloping stay bridge using digital camera

作　　者：刘世杰[1] 叶勤[1] 童小华[1] 孙智[2] 周德意[1] 侯宁[2] 

机构地区：[1]同济大学测量与国土信息工程系,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《吉林大学学报（工学版）》2007年第4期920-924,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金资助项目(40301043);教育部高等学校科技创新工程重大项目培育资金资助项目(704019);上海市青年科技启明星计划项目(05QMX1456)

摘　　要：结合数字近景摄影测量技术的优点及斜拉桥拉索变形的特点,利用普通数码相机对斜拉桥拉索模型的变形进行非接触式测量。考虑到相机光学畸变的直接线性变换,在确定变形平面的基础上,利用单张相片求解目标点物方三维坐标。介绍了实验的整个过程,包括控制点布设、相片拍摄、参数求解、变形平面确定、拉索上目标点变形值计算等。通过对已知点检验证明了用本文方法得到的变形测量精度能满足对桥梁模型进行分析研究的要求。In view of the advantages of characteristics of the stay cable of the s deformation of the stay cable model usin direct linear transformation accounting for of the target point in the object space can digital close shot photogrammetry and the deformation ping ga the be stay bridge, a contactless inspection technique for the household digital camera was proposed. Based on the camera optical distor calculated from a sin tlon, gle i the 3-dimensional mage if the deform coordinates ation plane has been determined. The proposed technique was verified experimentally and presented, including the placement of the control points, the image acquisition, the parameters deformation plane determination, and the deformation calculation of the stay cable showed through a comparison with the coordinates of the check points, the precis technique is high enough for the measurement in the lab test of the stay cable.

关 键 词：信息处理技术 近景摄影测量 斜拉桥拉索 斜拉桥 变形监测 直接线性变换 数码相机 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]