一种基于图像灰度变化的水平位移监测方法  

A Horizontal Displacement Monitoring Method Based on Image Gray Change

作　　者：贺异欣 汪岚峰 HE Yixin;WANG Lanfeng(Guangzhou Guangjian Construction Engineering Testing Center Co.,Ltd.,Guangzhou 510600,China)

机构地区：[1]广州广检建设工程检测中心有限公司,广东广州510600

出　　处：《测绘与空间地理信息》2023年第8期67-70,共4页Geomatics & Spatial Information Technology

基　　金：广东省市场监督管理局科研公关项目(2022CZ09)资助。

摘　　要：以利用数字图像相关算法准确跟踪被测物上目标点的运动为核心,首先提出了定量、可靠地评价变形前后图像子区相似程度的方法;然后利用Newton-Raphson模型提高了亚像素位移监测精度;最后使用图像子区平均灰度梯度来评价图像质量,获得水平位移监测结果。选取模拟基坑进行区域位移监测试验,并与国内流行的水平位移监测方法进行对比分析。In this paper,the motion of target points on the measured object is accurately tracked by digital image correlation algorithm.Firstly,a method to quantitatively and reliably evaluate the similarity of image sub regions before and after deformation is proposed;Then,the accuracy of sub-pixel displacement monitoring is improved by using Newton-Raphson model;Finally,the average gray gradient of image sub area is used to evaluate the image quality and obtain the horizontal displacement monitoring results.The simulated foundation pit is selected for regional displacement monitoring test,and compared with the popular horizontal displacement monitoring method in China.

关 键 词：参考场 变形场 Newton-Raphson图像变形模型 二阶梯度矩阵 

分 类 号：P209[天文地球—测绘科学与技术]