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To achieve quantitative detection of bolt loosening angles through single frame images, a method based on color segmentation and connected domain feature processing was designed. Firstly, a method for performing nonlinear stretching, normalization and optimal threshold segmentation on a component successively in the Lab color space was designed to segment and represent the red anti-loosening line image of the bolt loosening angle. Secondly, the morphological operations were performed on the image by using the open operation. Then, the orientation vector of the connected domain in the anti-loose line image was determined by computing the geometric moments. Finally, the bolt loosening angle was determined through the four-quadrant arctangent function. The results demonstrate that the precise measurement of the bolt loosening angle through a single frame image can be achieved by this detection algorithm, with a maximal relative error of 1.80%, its accuracy meets the needs of engineering practice and has strong engineering application value.
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为实现通过单帧图像对螺栓松动角度进行定量检测,设计了一种基于颜色分割和连通域特征处理的方法。首先,设计一种在Lab颜色空间下,对a分量先后进行非线性拉伸、归一化及最优阈值分割的方法来分割表征螺栓松动角度的红色防松线图像;其次,利用开运算对图像进行形态学操作;然后,通过计算防松线图像中连通域的几何矩确定其方向矢量;最后,通过四象限反正切函数确定螺栓松动角度。结果表明,检测算法能够实现通过单帧图像对螺栓松动角度进行精确测量,最大相对误差为1.80%,其精度满足工程实践需要,具有较强的工程应用价值。
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康晶杰,男,1993年生,浙江宁波人,硕士,助理研究员;主要研究方向为结构安全智能监测;E-mail:kangjingjie23@163.com。
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康晶杰,男,1993年生,浙江宁波人,硕士,助理研究员;主要研究方向为结构安全智能监测;E-mail:kangjingjie23@163.com。
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21(5):2048-2062., articleTitle=A two-step computer vision-based framework for bolt loosening detection and its implementation on a smartphone application, refAbstract=null)], funds=[Fund(id=1241400392710418470, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, awardId=202003N4342, language=EN, fundingSource=Ningbo Natural Science Foundation(202003N4342), fundOrder=null, country=null), Fund(id=1241400392811081771, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, awardId=202003N4342, language=CN, fundingSource=宁波市自然科学基金项目(202003N4342), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241400383654916816, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, xref=null, ext=[AuthorCompanyExt(id=1241400383663305426, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, companyId=1241400383654916816, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Ningbo Branch of China Academy of Ordnance Science, Ningbo 315103, China), AuthorCompanyExt(id=1241400383671694036, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, companyId=1241400383654916816, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中国兵器科学研究院宁波分院,宁波 315103)])], figs=[ArticleFig(id=1241400388746802096, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.1, caption=
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方法概述, figureFileSmall=CycZ7FVnrLcw7E7/nrUC1w==, figureFileBig=urUv463a0k43n1iczjBVsg==, tableContent=null), ArticleFig(id=1241400390617461699, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.3, caption=
Original image and the a component of the original image, figureFileSmall=E38pjCBDfMWC9g2wV9rIRw==, figureFileBig=zOMjFv29f85vacQPbLmlyQ==, tableContent=null), ArticleFig(id=1241400390722319304, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图3, caption=
原图及原图的a分量, figureFileSmall=E38pjCBDfMWC9g2wV9rIRw==, figureFileBig=zOMjFv29f85vacQPbLmlyQ==, tableContent=null), ArticleFig(id=1241400390806205391, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.4, caption=
Segmentation result of the anti-loosening line image, figureFileSmall=RRwihsRNj71swD9v4LJCtw==, figureFileBig=a7JBoal58l8xljXzgSIXMA==, tableContent=null), ArticleFig(id=1241400390894285777, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图4, caption=
防松线图像分割结果, figureFileSmall=RRwihsRNj71swD9v4LJCtw==, figureFileBig=a7JBoal58l8xljXzgSIXMA==, tableContent=null), ArticleFig(id=1241400390969783253, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.5, caption=
Identification results of two anti-loosening lines, figureFileSmall=TuP0AHiSEAZAzAD+15ZRnQ==, figureFileBig=Iy4j8HOa538n6nZNgbFNGg==, tableContent=null), ArticleFig(id=1241400391036892120, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图5, caption=
两防松线识别结果, figureFileSmall=TuP0AHiSEAZAzAD+15ZRnQ==, figureFileBig=Iy4j8HOa538n6nZNgbFNGg==, tableContent=null), ArticleFig(id=1241400391095612382, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.6, caption=
Test platform, figureFileSmall=Nnmlj/DUgEni1UEgCbddaw==, figureFileBig=+VAchxBoulFyFzkQRIY0Gw==, tableContent=null), ArticleFig(id=1241400391196275682, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图6, caption=
试验平台, figureFileSmall=Nnmlj/DUgEni1UEgCbddaw==, figureFileBig=+VAchxBoulFyFzkQRIY0Gw==, tableContent=null), ArticleFig(id=1241400391280161766, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.7, caption=
Absolute error of angle measurement results, figureFileSmall=o+i5Y4MeGFWu10qMHtjtDg==, figureFileBig=gKK1z31nw0Ei3IvAVPjEWw==, tableContent=null), ArticleFig(id=1241400391397602283, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图7, caption=
角度测量结果绝对误差, figureFileSmall=o+i5Y4MeGFWu10qMHtjtDg==, figureFileBig=gKK1z31nw0Ei3IvAVPjEWw==, tableContent=null), ArticleFig(id=1241400391510848496, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.8, caption=
Adjusting shooting distance to obtain images at near,medium, and far distances, figureFileSmall=FwtNn3ttXR+bega3Ru/9iA==, figureFileBig=xciLEzA6gW2rp/X0ti34Zw==, tableContent=null), ArticleFig(id=1241400391615706101, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图8, caption=
调整拍摄距离获取距离为近、中和远的图像, figureFileSmall=FwtNn3ttXR+bega3Ru/9iA==, figureFileBig=xciLEzA6gW2rp/X0ti34Zw==, tableContent=null), ArticleFig(id=1241400391712175096, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Fig.9, caption=
Absolute error of angle measurement results at different shooting distances, figureFileSmall=QQGMCve1I6XIh10h2aMxqg==, figureFileBig=qGfxJkHnlCndxqr9RWgzOw==, tableContent=null), ArticleFig(id=1241400391796061180, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=图9, caption=
不同拍摄距离的角度测量结果绝对误差, figureFileSmall=QQGMCve1I6XIh10h2aMxqg==, figureFileBig=qGfxJkHnlCndxqr9RWgzOw==, tableContent=null), ArticleFig(id=1241400391888335872, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Tab.1, caption=
Camera parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 Parameter | 值 Value |
|---|
| 光圈 Aperture | f/1.6 |
| 焦距 Focal length/mm | 53 |
| 图像分辨率 Image resolution/(Pixels×Pixels) | 3 024×3 024 |
), ArticleFig(id=1241400391976415236, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=表1, caption=
相机参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 Parameter | 值 Value |
|---|
| 光圈 Aperture | f/1.6 |
| 焦距 Focal length/mm | 53 |
| 图像分辨率 Image resolution/(Pixels×Pixels) | 3 024×3 024 |
), ArticleFig(id=1241400392047718406, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Tab.2, caption=
Selected parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 Parameter | 值 Value |
|---|
非线性拉伸参数k1 Nonlinear stretch parameter k1 | 3 |
结构元B大小 Size of structuring element B | 3×3 |
), ArticleFig(id=1241400392144187404, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=表2, caption=
选取的参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 Parameter | 值 Value |
|---|
非线性拉伸参数k1 Nonlinear stretch parameter k1 | 3 |
结构元B大小 Size of structuring element B | 3×3 |
), ArticleFig(id=1241400392240656400, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Tab.3, caption=
Measurement results of the full range of bolt loosening angles
, figureFileSmall=null, figureFileBig=null, tableContent=
实际角度 Actual angle/(°) | 检测角度 Detection angle/(°) | 绝对误差 Absolute error/(°) | 相对误差 Relative error/% |
|---|
| 5 | 5.02 | 0.02 | 0.40 |
| 10 | 10.08 | 0.08 | 0.80 |
| 30 | 30.30 | 0.30 | 1.00 |
| 60 | 59.84 | 0.16 | 0.27 |
| 120 | 120.15 | 0.15 | 0.13 |
| 150 | 149.73 | 0.27 | 0.18 |
| 240 | 240.10 | 0.10 | 0.04 |
| 300 | 299.93 | 0.07 | 0.02 |
| 350 | 350.38 | 0.38 | 0.11 |
| 360 | 359.84 | 0.16 | 0.04 |
), ArticleFig(id=1241400392337125395, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=表3, caption=
螺栓松动全角度测量结果
, figureFileSmall=null, figureFileBig=null, tableContent=
实际角度 Actual angle/(°) | 检测角度 Detection angle/(°) | 绝对误差 Absolute error/(°) | 相对误差 Relative error/% |
|---|
| 5 | 5.02 | 0.02 | 0.40 |
| 10 | 10.08 | 0.08 | 0.80 |
| 30 | 30.30 | 0.30 | 1.00 |
| 60 | 59.84 | 0.16 | 0.27 |
| 120 | 120.15 | 0.15 | 0.13 |
| 150 | 149.73 | 0.27 | 0.18 |
| 240 | 240.10 | 0.10 | 0.04 |
| 300 | 299.93 | 0.07 | 0.02 |
| 350 | 350.38 | 0.38 | 0.11 |
| 360 | 359.84 | 0.16 | 0.04 |
), ArticleFig(id=1241400392454565912, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=EN, label=Tab.4, caption=
Measurement results of bolt loosening angles
, figureFileSmall=null, figureFileBig=null, tableContent=
拍摄距离 Shooting distance/cm | 实际角度 Actual angle/(°) | 检测角度 Detection angle/(°) | 相对误差 Relative error/% |
|---|
| 20 | 5 | 4.95 | 1.00 |
| 10 | 9.95 | 0.50 |
| 30 | 30.10 | 0.33 |
| 35 | 5 | 4.99 | 0.20 |
| 10 | 10.09 | 0.90 |
| 30 | 29.97 | 0.10 |
| 50 | 5 | 5.09 | 1.80 |
| 10 | 9.93 | 0.70 |
| 30 | 30.02 | 0.07 |
), ArticleFig(id=1241400392538451999, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241394836859842830, language=CN, label=表4, caption=
螺栓松动角度检测结果
, figureFileSmall=null, figureFileBig=null, tableContent=
拍摄距离 Shooting distance/cm | 实际角度 Actual angle/(°) | 检测角度 Detection angle/(°) | 相对误差 Relative error/% |
|---|
| 20 | 5 | 4.95 | 1.00 |
| 10 | 9.95 | 0.50 |
| 30 | 30.10 | 0.33 |
| 35 | 5 | 4.99 | 0.20 |
| 10 | 10.09 | 0.90 |
| 30 | 29.97 | 0.10 |
| 50 | 5 | 5.09 | 1.80 |
| 10 | 9.93 | 0.70 |
| 30 | 30.02 | 0.07 |
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