混凝土超声CT层析成像算法的改进
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摘要
为提高混凝土超声层析成像的速度和精度,提出一种改进的快速图像代数重建迭代算法(IART),算法根据投影数据初步判定每个成像单元为缺陷的概率大小,由此概率选取迭代初值,并在迭代过程中根据概率大小分配投影误差。试验结果表明:IART算法有效控制了波速离差,提高了计算的精度和图像重建质量,实现了混凝土层析成像的实时性;对混凝土试件进行测试,IART算法相比于常规选代重建算法(ART)更能准确地反映混凝土内部结构。
In order to enhance the speed and to improve the accuracy of the ultrasonic computerized tomography of concrete,an improved algebraic reconstruction technique(IART) is presented.In IART algorithm,the defect probability of each unit is accounted based on the detected data.Then,the images of concrete structures are initialized,and the error of detected data is distributed depend on the probability.The results show that the IART algorithm is effective to control wave velocity dispersion and to improve the accuracy of computation and the quality of image reconstruction on concrete;the IART algorithm is more accurate for reflecting the internal structure of concrete.2 tabs,4 figs,8 refs.
In order to enhance the speed and to improve the accuracy of the ultrasonic computerized tomography of concrete,an improved algebraic reconstruction technique(IART) is presented.In IART algorithm,the defect probability of each unit is accounted based on the detected data.Then,the images of concrete structures are initialized,and the error of detected data is distributed depend on the probability.The results show that the IART algorithm is effective to control wave velocity dispersion and to improve the accuracy of computation and the quality of image reconstruction on concrete;the IART algorithm is more accurate for reflecting the internal structure of concrete.2 tabs,4 figs,8 refs.
引文
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[2]Kwon J,Choi S J,Song S M H.Implementation andevaluation of the ultrasonic TOF tomography for theNDT of concrete structures[C]//SPIE.Proceedingsof SPIE:the International Society for Optical Engi-neering.San Tose:SPIE,2005:47-54.
[3]Papoulis A.New algorithm in spectra analysis andband-limited signal extrapolation[J].IEEE Transac-tion on Circuits and Systems,1975,22(9):735-742.
[4]Liu Z Q,Sun J P.Structured image retrieval[J].Jour-nal of Visual Languages and Computing,1997,8(3):333-357.
[5]曹俊兴,聂在平.基于物理模型的成像算法评价与SASART成像算法[J].成都理工学院学报,1998,25(4):473-479.CAO Jun-xing,NIE Zai-ping.Model based evaluationmethod for the imaging inversion algorithms andSASART algorithm[J].Journal of Chengdu Universi-ty of Technology,1998,25(4):473-479.
[6]吴律.层析基础及其在井间地震中的应用[M].北京:石油工业出版社,1997.
[7]井西利,杨长春,李幼铭.建立速度模型的层析成像方法研究[J].石油物探,2002,41(1):72-75.JING Xi-li,YANG Chang-chun,LI You-ming.Studyof tomographic inversion in the construction of veloci-ty model[J].Geophysical Prospecting for Petroleum,2002,41(1):72-75.
[8]杨文采,杜剑渊.层析成像新算法及其在工程检测上的应用[J].地球物理学报,1994,37(2):239-244.YANG Wen-cai,DU Jian-yuan.A new algorithm ofseismic tomography with application to engineeringdetections[J].ACTA Geophysica Sinica,1994,37(2):239-244.
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