模拟散斑尺寸对数字图像相关算法影响分析  

Influence of stimulated speckle size on digital image correlation algorithm

作　　者：刘宁 王盼 黄建伟 王璐 张辰 李水平 LIU Ning;WANG Pan;HUANG Jianwei;WANG Lu;ZHANG Chen;LI Shuiping(China Design Group Co.,Ltd.,Nanjing 210014,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;National Observation and Research Station of Gravitation and Solid Earth Tides in Wuhan,Wuhan 430071,China)

机构地区：[1]华设设计集团股份有限公司,江苏南京210014 [2]合肥工业大学土木与水利工程学院,安徽合肥230009 [3]武汉引力与固体潮国家野外科学观测研究站,湖北武汉430071

出　　处：《合肥工业大学学报（自然科学版）》2022年第9期1204-1208,共5页Journal of Hefei University of Technology：Natural Science

基　　金：中央高校基本科研业务费专项资金资助项目(JZ2021HGTA0169);武汉引力与固体潮国家野外科学观测研究站开放研究基金资助项目(WHYWZ202107);国有企业合作委托类资助项目(W2021JSKF0799)。

摘　　要：数字散斑测试精度的影响因素相对较多、精准控制难度较大,定量分析程度不足。为了提高数字散斑测试精度,文章通过模拟散斑的方法分析观测散斑尺寸大小对计算结果的影响。结果表明:随着散斑尺寸的增加,位移计算误差呈现先降后升的趋势,即散斑尺寸过大或者过小都不利于数字图像相关的位移计算,最优散斑尺寸为5~7像素。研究结果为数字图像相关计算的观测对象设计提供了数据基准,为实际现场监测的观测目标变形信息的精度提高提供了数据基础。There are many factors affecting the accuracy of digital speckle measurement. It is difficult to accurately control these factors, and the degree of quantitative analysis is insufficient. In order to improve the accuracy of digital speckle measurement, the speckle simulation focusing on the influence of the size of observed speckle on the calculation results was conducted. The results show that the displacement calculation error decreases first and then increases with the increase of speckle size, suggesting that too large or too small speckle size is not conducive to the displacement calculation of digital image correlation, and the optimal speckle size is 5-7 pixel. The research results provide a data benchmark for the observation object design of digital image correlation calculation, and provide a data basis for improving the accuracy of observation target deformation information monitored in the actual field.

关 键 词：数字图像相关 位移测量 模拟散斑 散斑尺寸 摄影测量 

分 类 号：P234.1[天文地球—摄影测量与遥感]