1. A method for tracking at least one of an ablation catheter and a circumferential mapping catheter in a fluoroscopic image sequence, comprising: initializing a catheter electrode model of one of an ablation catheter and a circumferential mapping catheter in a first frame of a fluoroscopic image sequence based on input electrode locations in the first frame; and tracking the catheter electrode model of the one of the ablation catheter and the circumferential mapping catheter in a second frame of the fluoroscopic image sequence by: detecting catheter landmark candidates in a second frame of the fluoroscopic image sequence using at least one trained catheter landmark detector; generating tracking hypotheses for the catheter electrode model of the one of the ablation catheter and the circumferential mapping catheter in the second frame based on the detected catheter landmark candidates; and selecting one of the tracking hypotheses as the catheter electrode model of the one of the ablation catheter and the circumferential mapping catheter in the second frame.