管道漏磁内检测信号的自适应成像算法研究
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摘要
为提高检测效率,克服管道漏磁内检测技术大量检测数据存储及缺陷识别的困难,基于管道漏磁检测数据的特征,通过比较多种插值方法在漏磁检测信号中的应用,设计了一种基于三次Hermite插值的三次样条插值算法,采用多尺度分段自适应插值方法处理漏磁数据,生成了具有更高辨识度的曲线图形;设计了可显示曲线图形、灰度图像以及伪彩色图像的自适应成像系统,实现了快速精准的漏磁缺陷检测识别。测试实践表明:研究工作达到了上述目标。
In order to reduce the difficulty in storage and defect identification of large number of magnetic flux leakage detection data to improve internal detection efficiency, this paper designs a Cubic Spline Interpolation Algorithm based on Cubic Hermite Interpolation according to the characteristics of magnetic flux leakage detection data of the pipeline and using segmented ideas, and utilizes a multiscale segmented self-adaptive interpolation method to process the magnetic flux leakage data and generates a more recognizable curve pattern. The curve pattern, gray-scale image and pseudo-color image can be displayed by the self-adaptive visualization system, which realizes fast and accurate defect inspection and identification of magnetic flux leakage. The practical test proves the research work achieves the designed objects.
In order to reduce the difficulty in storage and defect identification of large number of magnetic flux leakage detection data to improve internal detection efficiency, this paper designs a Cubic Spline Interpolation Algorithm based on Cubic Hermite Interpolation according to the characteristics of magnetic flux leakage detection data of the pipeline and using segmented ideas, and utilizes a multiscale segmented self-adaptive interpolation method to process the magnetic flux leakage data and generates a more recognizable curve pattern. The curve pattern, gray-scale image and pseudo-color image can be displayed by the self-adaptive visualization system, which realizes fast and accurate defect inspection and identification of magnetic flux leakage. The practical test proves the research work achieves the designed objects.
引文
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[8]雷江东,李久丹,罗艳,等.三种不同灰度图像增强算法比对[J].广西科学院学报,2012,26(4):418-419.
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[2] AFZAL M,UDPA S. Advanced signal processing of magnetic flux leakage data obtained from seamless gas pipeline[J].NDT&E Intemational,2002,35(8):449-457.
[3]郭小乐.基于matlab的常见插值法及其应用[J].赤峰学院学报(自然版),2017,33(7):5-7.
[4]张旭臣.分段三次Hermite插值在水文上的应用[J].南水北调与水利科技,2009,7(5):92-94.
[5]孔龙星,汤晓安,张俊达,等.顾及局部特性的自适应3D矢量场反距离权重插值法[J].系统工程与电子技术,2016,38(7):1 697-1 702.
[6]韩帅.灰度图像分割算法的研究[D].济南:山东大学,2007.
[7]杨帆.图像增强算法研究[D].武汉:武汉科技大学,2011.
[8]雷江东,李久丹,罗艳,等.三种不同灰度图像增强算法比对[J].广西科学院学报,2012,26(4):418-419.
[9] RAFAEL C GONZALEZ,RIEHARD E WOODS. Digital Image Proeessing[M].北京:电子工业出版社,2004,55-59.
[10] LISCHINSKI D, WEISS Y. Colorization using optimization[J].Proc. ACM SIGGR-APH,2004,14(9):689-693.