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.