基于双循环改进landweber电容层析成像图像重建  

Image Reconstruction of Electrical Capacitance Tomography Based on Double Circulation Improved Landweber

作　　者：严春满[1] 刘晓敏 YAN Chunman;LIU Xiaomin(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou Gansu 730070,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《传感技术学报》2022年第1期107-113,共7页Chinese Journal of Sensors and Actuators

摘　　要：针对电容层析成像(ECT)技术中反问题(即图像重建)的不适定性,以8电极电容层析成像系统为对象,在分析Landweber算法原理的基础上,根据Frozen Landweber迭代法,将基于权重因子的landweber算法进行内外双循环,获得一种迭代次数较少、收敛速度较快、重建图像质量较佳的改进算法,并将改进算法应用于ECT图像重建。数值仿真结果表明,对各种流型,改进算法在重建图像的客观评价指标及主观效果上均有明显改善,且对初值具有不敏感性,体现其实际应用价值。Aiming at the ill posedness of the inverse problem(image reconstruction)in electrical capacitance tomography(ECT),taking the 8-electrode electrical capacitance tomography system as the object, on the basis of analyzing the principle of Landweber algorithm, according to the Frozen Landweber iterative method, the Landweber algorithm based on weight factor is used for inner and outer double loops, and a new algorithm with less iterations, faster convergence speed and better performance is obtained.The improved algorithm is applied to ECT image reconstruction. The numerical simulation results show that, for various flow patterns, the improved algorithm has obvious improvement in the objective evaluation index and subjective effect of the reconstructed image, and is insensitive to the initial value, which reflects its practical application value.

关 键 词：电容层析成像 图像重建 landweber算法 双循环 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]