水电枢纽水下摄像数据的畸变机理及标定研究  

Research on Distortion Mechanism and Calibration of Underwater Photography of Dam

作　　者：李永龙 张华[1] 王皓冉[3] 齐宪荣[4] 汪双 LI Yong-long;ZHANG Hua;WANG Hao-ran;QI Xian-rong;WANG Shuang(School of Information and Engineering,Southwest University of Science and Technology,Mianyang 621000,China;Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu 610000,China;State Key Lab.of Hydroscience and Engineering,Tsinghua University,Beijing 100841,China;Jialing River Tingzikou Water Conservancy and Hydropower Development Co.,Ltd.,Guangyuan 628400,China)

机构地区：[1]西南科技大学信息工程学院,绵阳621000 [2]清华四川能源互联网研究院,成都610000 [3]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [4]嘉陵江亭子口水利水电开发有限公司,广元628400

出　　处：《自动化与仪表》2019年第12期75-79,共5页Automation & Instrumentation

基　　金：四川省科技计划资助项目(2018JZ0001,2018GZDZX0043,2019YFG0143)

摘　　要：水电枢纽建筑物水下检测的方法中,水下摄像是一种易用和直观的方法,但水下摄像数据研究往往忽视水下畸变,给水下缺陷分析和水下三维重建带来不可忽视的偏差。从成像原理的角度分析了水下成像过程中畸变的产生原理和基本特性;以某电站消力池边墙水下拍摄为试验目标,采用张正友标定法和MatLab工具箱进行了水下相机的参数标定,并使用相机参数对水下拍摄的边墙图像进行了矫正。通过重投影误差偏差和露骨料像素值偏差的对比分析,证实该标定方法有效性以及水下畸变的径向特征,为进一步的精确量化分析提供了基础。Underwater photography was an easy and intuitive method in underwater detection of hydropower junction buildings,but in the study of underwater photographic data,underwater distortion was often neglected,which brings undeniable deviation to underwater defect analysis and underwater three-dimensional reconstruction.In this paper,the principle and basic characteristics of distortion in underwater imaging were analyzed from the perspective of imaging principle.Taking underwater photography of side wall of stilling basin of a power station as experimental object,the parameters of underwater camera are calibrated by Zhang Zheng-you calibration method and MatLab toolbox,and the parameters of the camera are used to correct the underwater side wall images.The validity of the calibration method and the radial characteristics of underwater distortion are verified by comparing the re-projection error deviation with the exposed aggregate pixel value deviation,which provides a basis for further accurate quantitative analysis.

关 键 词：标定方法 水下拍摄 畸变机理 消力池 水电枢纽 

分 类 号：TV738[水利工程—水利水电工程] TP391[自动化与计算机技术—计算机应用技术]