1. A method for marker detection in fluoroscopic imaging of a stent, the method comprising: individually detecting a plurality of possible markers for a stent in one frame of fluoroscopic data without information from other frames of fluoroscopic data, the individual detecting being with a first machine-trained classifier; 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; and outputting an image representing information about the pair of markers.