3. The method of claim 1 , wherein the step of initializing a catheter electrode model in a first frame of a fluoroscopic image sequence based on input locations of a plurality of CS catheter electrodes in the first frame comprises: determining a number of CS catheter electrodes in the first frame; and if the number of CS catheter electrodes in the first frame is greater than a threshold, decomposing the plurality of CS catheter electrodes into multiple parts, and initializing separate catheter electrode models in the first frame for the multiple parts, wherein the catheter electrode model initialized in the first frame comprises the separate catheter electrode models initialized for the multiple parts.
3. The method of claim 1 , wherein the step of initializing a catheter electrode model in a first frame of a fluoroscopic image sequence based on input locations of a plurality of CS catheter electrodes in the first frame comprises: determining a number of CS catheter electrodes in the first frame; and if the number of CS catheter electrodes in the first frame is greater than a threshold, decomposing the plurality of CS catheter electrodes into multiple parts, and initializing separate catheter electrode models in the first frame for the multiple parts, wherein the catheter electrode model initialized in the first frame comprises the separate catheter electrode models initialized for the multiple parts. 4. The method of claim 3 , wherein the step of decomposing the plurality of CS catheter electrodes into multiple parts comprises: splitting the CS catheter electrodes into multiple parts based on curvature of a spline representing the CS catheter.