一种X射线成像系统模型及其快速标定方法

An imaging model for X-ray system and its calibration method

关键词:  射线检测  焊缝缺陷  成像模型  标定

Key words:  inspection with X-ray  weld defect  imaging model  calibration

摘要:

利用X射线进行工件内部缺陷检测是目前应用最广泛的无损检测方法之一,基于图像处理的自动检测技术是其主要发展方向。系统成像模型的建立和标定确定了成像目标与其图像之间的几何对应关系,是利用图像进行自动定位与测量的前提。在忽略一些非线性因素如图像增强器输入屏形状等的情况下,针对用于大直径螺旋钢管焊缝缺陷自动检测的射线成像系统,提出一种简便、可操作性强的方法进行建模并进行标定,结果表明了所采用方法的有效性。

Abstract:

It's one of the most extensive methods to inspect workpiece with X-ray and automatic inspection based on image processing is an important field. The imaging model and calibration establish a geometrical relationship between workpiece and its image, which is the precondition for automatic orientation and measurement with images. Ignored some factors such as the shape of the image intensifier's input screen, the paper develops a model and calibration method for the imaging system used in automatic nondestructive testing system, which is used in weld defect inspection. The results show that the method is effective.