State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, China.
School of Engineering, The University of Tokyo, Tokyo, Japan.
J Xray Sci Technol. 2016 Nov 22;24(6):797-805. doi: 10.3233/XST-160588.
The use of portable and high-energy X-ray system can provide a very promising approach for on-site nondestructive inspection of inner steel reinforcement of concrete structures. However, the noise properties and contrast of the radiographic images for thick concrete structures do often not meet the demands. To enhance the images, we present a simple and effective method for noise reduction based on a combined curvelet-wavelet transform and local contrast enhancement based on neighborhood operation. To investigate the performance of this method for our X-ray system, we have performed several experiments with using simulated and experimental data. With comparing to other traditional methods, it shows that the proposed image enhancement method has a better performance and can significantly improve the inspection performance for reinforced concrete structures.
便携式高能 X 射线系统的使用为现场无损检测混凝土结构内部钢筋提供了一种很有前途的方法。然而，厚混凝土结构的射线照相图像的噪声特性和对比度通常不能满足要求。为了增强图像，我们提出了一种基于联合曲波-小波变换和基于邻域操作的局部对比度增强的简单有效的降噪方法。为了研究该方法在我们的 X 射线系统中的性能，我们使用模拟和实验数据进行了多次实验。与其他传统方法相比，结果表明，所提出的图像增强方法具有更好的性能，可以显著提高钢筋混凝土结构的检测性能。
