1. A method for marker detection in fluoroscopic imaging of a stent, the method comprising: receiving, from a fluoroscopic scanner, a fluoroscopic scan of a patient; masking the fluoroscopic scan of the patient to limit the number of locations to which marker detection is applied; individually detecting a plurality of possible markers for a stent in one frame of fluoroscopic data from the fluoroscopic scan without information from other frames of fluoroscopic data from the fluoroscopic scan, the individual detecting being with a first machine-trained classifier, wherein the first machine-trained classifier does not detect masked out locations; jointly detecting a pair of markers from the plurality of possible markers for the stent output from the individually detecting, the joint detecting being with a second machine-trained classifier, wherein the second machine-trained classifier does not detect masked out locations; and outputting an image representing information about the pair of markers.