关键词: 电容层析成像, Landweber图像重建算法, 灵敏度, 均值滤波

Abstract: The Landweber image reconstruction algorithm based on imaging sensitive field mean filtering method is proposed to solve the so-called “soft-field” characteristic problem of sensitive field of Electrical Capacitance Tomography（ECT） system. The algorithm principle is that the neighborhood pixel sensitivity is averaged by template convoluting method, which can reduce the sensitivity of region near electrodes and improve that of central region of pipe. The algorithm can eliminate partly the effect on the quality of image reconstruction due to uneven sensitivity and improve image reconstruction accuracy. Simulation results indicate that the algorithm is superior to conventional Landweber algorithm in image reconstruction accuracy and convergence speed.

Key words: Electrical Capacitance Tomography（ECT）, Landweber image reconstruction algorithm, sensitivity, mean filtering