天津大学学报
天津大學學報
천진대학학보
JOURNAL OF TIANJIN UNIVERSITY SCIENCE AND TECHNOLOGY
2015年
8期
734-741
,共8页
电阻层析成像%绝对图像重建%灵敏度矩阵%阈值%图像相对误差
電阻層析成像%絕對圖像重建%靈敏度矩陣%閾值%圖像相對誤差
전조층석성상%절대도상중건%령민도구진%역치%도상상대오차
electrical resistance tomography%absolute image reconstruction%sensitivity matrix%threshold%relative image error
为了提高电阻层析成像重建图像分辨率,提出一种改进牛顿-拉夫逊绝对图像重建算法.在算法迭代过程中,采取灵敏度矩阵自动更新的策略,同时结合图像重建结果自动选取阈值,并根据阈值修正电阻率.仿真实验结果表明:相比单纯采用灵敏度矩阵自动更新策略的改进牛顿-拉夫逊算法,在无噪声干扰下,新算法图像相对误差平均降低了 35.620%,在 1%幅度噪声干扰下,新算法图像相对误差平均降低了 31.962%,在实现绝对图像重建的同时,有效提高了图像重建质量.
為瞭提高電阻層析成像重建圖像分辨率,提齣一種改進牛頓-拉伕遜絕對圖像重建算法.在算法迭代過程中,採取靈敏度矩陣自動更新的策略,同時結閤圖像重建結果自動選取閾值,併根據閾值脩正電阻率.倣真實驗結果錶明:相比單純採用靈敏度矩陣自動更新策略的改進牛頓-拉伕遜算法,在無譟聲榦擾下,新算法圖像相對誤差平均降低瞭 35.620%,在 1%幅度譟聲榦擾下,新算法圖像相對誤差平均降低瞭 31.962%,在實現絕對圖像重建的同時,有效提高瞭圖像重建質量.
위료제고전조층석성상중건도상분변솔,제출일충개진우돈-랍부손절대도상중건산법.재산법질대과정중,채취령민도구진자동경신적책략,동시결합도상중건결과자동선취역치,병근거역치수정전조솔.방진실험결과표명:상비단순채용령민도구진자동경신책략적개진우돈-랍부손산법,재무조성간우하,신산법도상상대오차평균강저료 35.620%,재 1%폭도조성간우하,신산법도상상대오차평균강저료 31.962%,재실현절대도상중건적동시,유효제고료도상중건질량.
A modified Newton-Raphson absolute image reconstruction algorithm was proposed to improve the space resolution of the reconstructed image in electrical resistance tomography(ERT). In the iteration process,the sensitiv-ity matrix was updated automatically;meanwhile,the resistivity was corrected according to a threshold determined by referring to the reconstruction result. Simulation experimentalresults demonstrate that compared to the modified Newton-Raphson method with sensitivity matrix updating,the proposed method reduces the relative image error by 35.620% in the noise-free case. With the existence of 1% noise,the proposed method reduces the relative image error by 31.962%. The proposed method enhances the imaging quality effectively while realizing absolute image reconstruc-tion.
