Article(id=1245390005183561746, tenantId=1146029695717560320, journalId=1241701559352995854, issueId=1245390004252426256, articleNumber=null, orderNo=null, doi=10.13197/j.eeed.2024.0304, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1682611200000, receivedDateStr=2023-04-28, revisedDate=1683302400000, revisedDateStr=2023-05-06, acceptedDate=null, acceptedDateStr=null, onlineDate=1774853715462, onlineDateStr=2026-03-30, pubDate=null, pubDateStr=null, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1774853715462, onlineIssueDateStr=2026-03-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774853715462, creator=13701087609, updateTime=1774853715462, updator=13701087609, issue=Issue{id=1245390004252426256, tenantId=1146029695717560320, journalId=1241701559352995854, year='2024', volume='44', issue='3', pageStart='1', pageEnd='230', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1774853715241, creator=13701087609, updateTime=1774854338522, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1245392618545332491, tenantId=1146029695717560320, journalId=1241701559352995854, issueId=1245390004252426256, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1245392618545332492, tenantId=1146029695717560320, journalId=1241701559352995854, issueId=1245390004252426256, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=41, endPage=51, ext={EN=ArticleExt(id=1245390005468774420, articleId=1245390005183561746, tenantId=1146029695717560320, journalId=1241701559352995854, language=EN, title=Detection and width measurement of concrete apparent cracks based on computer vision, columnId=null, journalTitle=Earthquake Engineering and Engineering Dynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=
Efficient detection of apparent cracks in reinforced concrete (RC) structures can provide evidence for rapid assessment of earthquake-damaged structures. Such work exhibits large and repetitive characteristics in both earthquake sites and laboratory environments, therefore, it is suitable to adopt the computer vision technology to make up the inefficiency and uncertainty of manual methods. Using images from consumer-grade cameras as data sources, a convolutional neural network (CNN) model suitable for concrete apparent crack detection is constructed by integrating U-Net and VGG-16, and the model training and testing are completed based on a multi-type RC component crack image database. Morphological operations and Otsu threshold segmentation are used to further optimize the crack detection results as input data for width measurement. To reduce the measurement error of crack width caused by the non-perpendicularity of the camera axis to the crack plane, perspective error correction is performed on the original image using specific targets. After verification, the average deviation of the crack width measurement after perspective error correction can be reduced up to 25%.
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对钢筋混凝土(reinforcement concrete,RC)结构表观裂缝的高效识别可以为结构震损快速评估提供佐证。无论在地震现场还是实验室环境,此类工作均表现出量大、重复的特征,适合利用计算机视觉技术完成,以弥补人工方式低效、不确定性强的劣势。以消费级相机输出图像作为数据源,融合U-Net和VGG-16构造适用于混凝土表观裂缝识别的卷积神经网络(convolutional neural network,CNN)模型,依托多类型RC构件裂缝图像数据库完成模型训练和测试。利用形态学运算、Otsu阈值分割等技术进一步优化裂缝识别结果作为宽度测量的输入数据。为降低相机光轴与裂缝平面不垂直带来的裂缝宽度测量误差,通过特定靶标对原始图像进行透视误差校正,经检验,透视误差校正后的裂缝宽度测量的平均偏差最大可降低约25%。
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1, address=
1.Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1245390012452290799, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, authorId=1245390012200632543, language=CN, stringName=王文斌, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1, address=
1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080, bio={"content":"
王文斌(1996—),男,硕士研究生,主要从事损伤识别技术研究。E-mail:wwb_nuhai@163.com
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王文斌(1996—),男,硕士研究生,主要从事损伤识别技术研究。E-mail:wwb_nuhai@163.com
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1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080)])]), Author(id=1245390012552954100, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, orderNo=1, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=wangxt@iem.ac.cn, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1245390012687171836, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, authorId=1245390012552954100, language=EN, stringName=Xiaoting WANG, firstName=Xiaoting, middleName=null, lastName=WANG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1, 2, address=
1.Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2.Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin 150080, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1245390012821389571, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, authorId=1245390012552954100, language=CN, stringName=王啸霆, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080
2.地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1245390011659567297, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, xref=1., ext=[AuthorCompanyExt(id=1245390011793785029, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, companyId=1245390011659567297, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1, 2, address=
1.Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2.Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin 150080, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1245390013257597211, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, authorId=1245390012930441482, language=CN, stringName=王涛, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080
2.地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1245390011659567297, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, xref=1., ext=[AuthorCompanyExt(id=1245390011793785029, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, companyId=1245390011659567297, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1.中国地震局工程力学研究所 地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080)]), AuthorCompany(id=1245390011965751501, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, xref=2., ext=[AuthorCompanyExt(id=1245390011995111632, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, companyId=1245390011965751501, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3.Beijing Institute of Architectural Design, Beijing 100045, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1245390013702193461, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, authorId=1245390013425369379, language=CN, stringName=陈曦, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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3.Beijing Institute of Architectural Design, Beijing 100045, China), AuthorCompanyExt(id=1245390012104163546, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, companyId=1245390012091580631, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3.北京市建筑设计研究院有限公司,北京 100045)])])], keywords=[Keyword(id=1245390013844799807, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, orderNo=1, keyword=apparent crack), Keyword(id=1245390013937074503, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, orderNo=2, keyword=computer vision), Keyword(id=1245390014050320718, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, orderNo=3, keyword=crack detection), Keyword(id=1245390014134206811, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, orderNo=4, keyword=crack width measurement), Keyword(id=1245390014243258727, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, orderNo=5, keyword=perspective error correction), Keyword(id=1245390014343922032, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, orderNo=1, keyword=表观裂缝), Keyword(id=1245390014469751162, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, orderNo=2, keyword=计算机视觉), Keyword(id=1245390014582997380, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, orderNo=3, keyword=裂缝识别), Keyword(id=1245390014817878412, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, orderNo=4, keyword=裂缝宽度测量), Keyword(id=1245390014918541717, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, orderNo=5, keyword=透视误差校正)], refs=[Reference(id=1245390018802467538, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, doi=null, pmid=null, pmcid=null, year=2008, volume=null, issue=null, pageStart=1, pageEnd=5, url=null, language=null, rfNumber=[1], rfOrder=0, authorNames=OLIVEIRA H, CORREIA P L, journalName=null, refType=null, unstructuredReference=
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Framework and workflow of overall methodology, figureFileSmall=W6FF0FFxIKdj07PK1C2JUg==, figureFileBig=Q/pVArRjhvCMyKmj50U6Ng==, tableContent=null), ArticleFig(id=1245390015233114545, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图1, caption=
总体方法框架和流程, figureFileSmall=W6FF0FFxIKdj07PK1C2JUg==, figureFileBig=Q/pVArRjhvCMyKmj50U6Ng==, tableContent=null), ArticleFig(id=1245390015463801278, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 2, caption=
Architecture of CrackNet, figureFileSmall=oTvbBTqHtuBPVzugU+nZWw==, figureFileBig=dETHUBXZa5HMNr6wd7d2xA==, tableContent=null), ArticleFig(id=1245390015572853189, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图2, caption=
CrackNet架构, figureFileSmall=oTvbBTqHtuBPVzugU+nZWw==, figureFileBig=dETHUBXZa5HMNr6wd7d2xA==, tableContent=null), ArticleFig(id=1245390015652544972, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 3, caption=
Composition components of basic image sources, figureFileSmall=La27+Pot3Vu5EhPfBahGWg==, figureFileBig=uFRa7b5OX4tftppFUmv4CQ==, tableContent=null), ArticleFig(id=1245390015744819664, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图3, caption=
基础图像源组成成分, figureFileSmall=La27+Pot3Vu5EhPfBahGWg==, figureFileBig=uFRa7b5OX4tftppFUmv4CQ==, tableContent=null), ArticleFig(id=1245390015849677277, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 4, caption=
Samples composition of image database, figureFileSmall=9C58p5wZQR30emkbzFQppw==, figureFileBig=at3DaYGV5o6MgvjCaPgk6A==, tableContent=null), ArticleFig(id=1245390015929369062, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图4, caption=
图像数据库样本构成, figureFileSmall=9C58p5wZQR30emkbzFQppw==, figureFileBig=at3DaYGV5o6MgvjCaPgk6A==, tableContent=null), ArticleFig(id=1245390016004866543, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 5, caption=
Flowchart for the generation of samples and labels, figureFileSmall=UmELaW+7hbmNOvFdD+YT2Q==, figureFileBig=HDCDX788iV0p4KVEwR+9Hw==, tableContent=null), ArticleFig(id=1245390016097141240, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图5, caption=
生成样本标签对流程图, figureFileSmall=UmELaW+7hbmNOvFdD+YT2Q==, figureFileBig=HDCDX788iV0p4KVEwR+9Hw==, tableContent=null), ArticleFig(id=1245390016210387459, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 6, caption=
Loss and mean IoU changes of model training, figureFileSmall=wzwHJ1KRk+DSv02JDFj9+A==, figureFileBig=BvqFPImPx8n1+fgqFDtG6A==, tableContent=null), ArticleFig(id=1245390016319439374, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图6, caption=
模型训练的损失函数和平均交并比变化, figureFileSmall=wzwHJ1KRk+DSv02JDFj9+A==, figureFileBig=BvqFPImPx8n1+fgqFDtG6A==, tableContent=null), ArticleFig(id=1245390016407519769, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 7, caption=
Crack cletection performance of the model on the test set, figureFileSmall=825c+zAkPgzygVX0ZiYS4Q==, figureFileBig=7DMzeMEG1G5WwOwfVBS13A==, tableContent=null), ArticleFig(id=1245390016499794469, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图7, caption=
模型在测试集上的裂缝识别效果, figureFileSmall=825c+zAkPgzygVX0ZiYS4Q==, figureFileBig=7DMzeMEG1G5WwOwfVBS13A==, tableContent=null), ArticleFig(id=1245390016600457774, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 8, caption=
Crack detection performance of the model, figureFileSmall=qa3aNTkZG1OS3hy8Vv16Ig==, figureFileBig=dtroWGrkx2bazqtaQ1tVPw==, tableContent=null), ArticleFig(id=1245390016675955256, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图8, caption=
模型裂缝识别效果, figureFileSmall=qa3aNTkZG1OS3hy8Vv16Ig==, figureFileBig=dtroWGrkx2bazqtaQ1tVPw==, tableContent=null), ArticleFig(id=1245390016772424261, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 9, caption=
Optimization flowchart of crack detection, figureFileSmall=tx4BFjzfbOlIYji/Y3ii7g==, figureFileBig=KT3PsTUODQ+lYgzNaNeoiA==, tableContent=null), ArticleFig(id=1245390016873087566, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图9, caption=
裂缝识别优化流程, figureFileSmall=tx4BFjzfbOlIYji/Y3ii7g==, figureFileBig=KT3PsTUODQ+lYgzNaNeoiA==, tableContent=null), ArticleFig(id=1245390016973750869, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 10, caption=
Apparent crack detection of RC structure on the earthquake site, figureFileSmall=JYX/7fsHdwOtO6zwAeIvCA==, figureFileBig=LGAg+/9joqoj1pa0PTMxzg==, tableContent=null), ArticleFig(id=1245390017057636957, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图10, caption=
地震现场RC结构表观裂缝识别, figureFileSmall=JYX/7fsHdwOtO6zwAeIvCA==, figureFileBig=LGAg+/9joqoj1pa0PTMxzg==, tableContent=null), ArticleFig(id=1245390017170883171, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 11, caption=
Perspective error, figureFileSmall=oe8/h/kQqp/BKkg2KcHF7w==, figureFileBig=aQtru7sdXLyRu++vc3R4Yw==, tableContent=null), ArticleFig(id=1245390017271546475, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图11, caption=
透视误差, figureFileSmall=oe8/h/kQqp/BKkg2KcHF7w==, figureFileBig=aQtru7sdXLyRu++vc3R4Yw==, tableContent=null), ArticleFig(id=1245390017368015471, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 12, caption=
Original image with perspective error and its corrected image, figureFileSmall=ZQiqjzpZgmE4IdiWRIFCqA==, figureFileBig=zyKWfXdHYG+gpO/FIqUbmw==, tableContent=null), ArticleFig(id=1245390017485455992, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图12, caption=
具有透视误差的原始图像及其校正图, figureFileSmall=ZQiqjzpZgmE4IdiWRIFCqA==, figureFileBig=zyKWfXdHYG+gpO/FIqUbmw==, tableContent=null), ArticleFig(id=1245390017590313604, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 13, caption=
Basic process of measuring crack width using image filtering method, figureFileSmall=DW4wky9TZhTsxzc69lna8Q==, figureFileBig=ysxtLp1/aMlqrMOznaJ8xA==, tableContent=null), ArticleFig(id=1245390017690976905, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图13, caption=
图像滤镜法测量裂缝宽度的基本流程, figureFileSmall=DW4wky9TZhTsxzc69lna8Q==, figureFileBig=ysxtLp1/aMlqrMOznaJ8xA==, tableContent=null), ArticleFig(id=1245390017779057294, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Fig. 14, caption=
Comparison of the original image, crack detection and crack synthetical tester images, figureFileSmall=IHnYLiJ53cqYTKtRCe/t9g==, figureFileBig=UrZmrnQMRcL8jyUEIVoE/w==, tableContent=null), ArticleFig(id=1245390017925857946, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=图14, caption=
原始图像、裂缝识别结果和裂缝综合测试仪图像的对比, figureFileSmall=IHnYLiJ53cqYTKtRCe/t9g==, figureFileBig=UrZmrnQMRcL8jyUEIVoE/w==, tableContent=null), ArticleFig(id=1245390018055881375, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Table 1, caption=
Evaluation indexes of models on the test set
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| 类别 | 类交并比 |
|---|
| 背景 | 97.76 |
| 裂缝 | 38.12 |
| 平均交并比 | 67.94 |
), ArticleFig(id=1245390018156544678, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=表1, caption=
模型在测试集上的评价指标
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别 | 类交并比 |
|---|
| 背景 | 97.76 |
| 裂缝 | 38.12 |
| 平均交并比 | 67.94 |
), ArticleFig(id=1245390018294956720, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=EN, label=Table 2, caption=
Comparison of crack width measurement results before and after perspective correction
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| 拍摄角度/(°) | 测试点 | Ct/mm | Cb/mm | (|Ct-Cb|/ Ct)/% | 平均偏差/% | Ca/mm | (|Ct-Ca|/ Ct)/% | 平均偏差/% |
|---|
| 30 | 1 | 0.19 | 0.212 | 12 | 11 | 0.196 | 3 | 9 |
| 2 | 0.23 | 0.216 | 6 | | 0.174 | 24 | |
| 3 | 0.37 | 0.427 | 15 | | 0.368 | 1 | |
| 5 | 1 | 0.19 | 0.253 | 33 | 19 | 0.242 | 27 | 14 |
| 2 | 0.23 | 0.263 | 14 | | 0.249 | 8 | |
| 3 | 0.37 | 0.405 | 9 | | 0.399 | 8 | |
| 60 | 1 | 0.19 | 0.433 | 128 | 72 | 0.334 | 76 | 47 |
| 2 | 0.23 | 0.353 | 53 | | 0.312 | 36 | |
| 3 | 0.37 | 0.494 | 34 | | 0.481 | 30 | |
), ArticleFig(id=1245390018383037111, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390005183561746, language=CN, label=表2, caption=
透视校正前后裂缝宽度测量结果比对
, figureFileSmall=null, figureFileBig=null, tableContent=
| 拍摄角度/(°) | 测试点 | Ct/mm | Cb/mm | (|Ct-Cb|/ Ct)/% | 平均偏差/% | Ca/mm | (|Ct-Ca|/ Ct)/% | 平均偏差/% |
|---|
| 30 | 1 | 0.19 | 0.212 | 12 | 11 | 0.196 | 3 | 9 |
| 2 | 0.23 | 0.216 | 6 | | 0.174 | 24 | |
| 3 | 0.37 | 0.427 | 15 | | 0.368 | 1 | |
| 5 | 1 | 0.19 | 0.253 | 33 | 19 | 0.242 | 27 | 14 |
| 2 | 0.23 | 0.263 | 14 | | 0.249 | 8 | |
| 3 | 0.37 | 0.405 | 9 | | 0.399 | 8 | |
| 60 | 1 | 0.19 | 0.433 | 128 | 72 | 0.334 | 76 | 47 |
| 2 | 0.23 | 0.353 | 53 | | 0.312 | 36 | |
| 3 | 0.37 | 0.494 | 34 | | 0.481 | 30 | |
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