微距拍摄条件下的裂缝二维变化测量算法  

Two-dimensional change measurement algorithm of crack under micro shooting condition

作　　者：杨程翔 丁勇[1] 李登华[2,3] YANG Chengxiang;DING Yong;LI Denghua(School of Science,Nanjing University of Science and Technology,Nanjing 210094,China;Nanjing Hydraulic Research Institute,Nanjing 210024,China;Key Laboratory of Reservoir Dam Safety,Ministry of Water Resources,Nanjing 210024,China)

机构地区：[1]南京理工大学理学院,江苏南京210094 [2]南京水利科学研究院,江苏南京210024 [3]水利部水库大坝安全重点实验室,江苏南京210024

出　　处：《测绘通报》2024年第1期115-119,125,共6页Bulletin of Surveying and Mapping

基　　金：国家重点研发计划(2022YFC3005502);国家自然科学基金(51979174);国家自然科学基金联合基金(U2040221);中央级公益性科研院所基本科研业务费专项(Y322008)。

摘　　要：结构性裂缝变化是建筑结构中常见的病害种类。针对微距拍摄下现有裂缝二维检测技术不足的问题,本文根据裂缝变化等效物理模型设计了一种能够适应微距拍摄的标靶,并提出了裂缝二维变化检测算法。本文算法由标靶靶别定位、畸变参数修正、裂缝参数计算等部分构成,由树莓派及摄像头组合形成微距图像采集装置,并基于室内试验验证。结果表明,该算法在微距拍摄下裂缝宽度变化测量精度在0.1 mm以内。Structural crack change is a common disease in building structures.In view of the shortcomings of the existing two-dimensional crack detection technology under macro photography,this paper designs a target that can adapt to macro photography according to the equivalent physical model of crack change,and develops a two-dimensional crack change detection algorithm.The algorithm consists of target target location,distortion parameter correction,crack parameter calculation and other parts.A micro-range image acquisition device is designed by combining raspberry pie and camera.Based on the indoor test verification,the measurement accuracy of the crack width change under the micro-distance photography is within 0.1 mm.

关 键 词：微距拍摄 图像校正 射影变换 裂缝变化 数字图像 

分 类 号：P258[天文地球—测绘科学与技术]