Study on StereoM atching Technique for Digital Radiography Images
射线图像的立体匹配技术研究

The 3D information of an object can not be obtained using the conventional computed tomography when the object is notfit for rotating scan in digital radiography(DR) inspection.So,stereo vision is a better solution.Stereo matching is an important research area in stereovision.Although stereo matching research has progressed remarkably,the studies are mostly aiming at reflection imaging field,such as visible light,and transmission imaging field,such as X-ray.For the dissimilarity of imaging principle,the stereo matching technique of transmission images is different from that of reflection images.In the paper,the stereo matching technique for X-ray images are studied in detail.Edge is advised to be used as matching primitive.According to the characters of X-ray images,the constraints of stereo matching are set up.The reasons of matching uncertainty are analyzed.Finally,the "coarse-to-fine" strategy is suggested and the constraint from multi-view images is used to implement fine matching.Finally,to validate the technique,digital radiography system with intensifier is used to imaging for a standard sample.The experimental results show that the technique is feasible.