摘要
提出一种在混凝土层析成像中对ART算法的射线矩阵的加权方法.利用BPT算法得到的低分辨率图像作为迭代初始值,并将其图形信息作为ART射线矩阵的加权系数.充分利用低分辨率图像的图形信息和数值信息,同时对高速异常单元和低速异常单元进行加权成像.计算机模拟试验表明,与传统的ART算法相比提高了反演数据的准确性和迭代速度;在走时数据误差不大于0.5%时,是对传统ART算法的一种较好的改进方法.
A weighting approach for ray matrix in ART algorithm for ultrasonic computerized tomography of concrete is developed. Firstly, a low-resolution image is generated by BPT algorithm and which is used as initial value of iteration. Then, information of low- resolution image is used as weighting coefficients for ray matrix of ART algorithm. Image information and numerical information are used fully. High speed and low speed abnormal units can be weighted. As data error is less than 0. 5% , examples show that the accuracy and iteration speed of improved method are better than that of traditional ART algorithm.
出处
《计算物理》
EI
CSCD
北大核心
2011年第5期725-729,共5页
Chinese Journal of Computational Physics
基金
中央高校基本科研业务费专项资金(09CX04066A)资助项目
