Device for extracting three-dimensional information from radiographic images of an object; process for calibrating said device; and process for generating said radiographic images includes an X-ray emitter and an X-ray sensor. A contour sensor represents contour points of an object by means of the radiation emitted or reflected by the object. The device also has a calibration framework with X-ray markers, and contour markers. The processes are based on taking contour and X-ray images of the calibration framework, first without an object of study and subsequently with one, taking into account the information provided by the markers, and the fact that the contour sensor is placed in the same manner with respect to the X-ray emitter in all the images taken.