System and method for conformal ablation planning

1. A fiducial tracking system, comprising:

a first device having a fiducial pattern disposed thereon, the fiducial pattern including a plurality of first unique identifiers disposed in a region and a plurality of second unique identifiers;

a second device having an image capture device disposed thereon, the image capture device configured to obtain a fiducial image of the fiducial pattern; and

a controller configured to:

receive the fiducial image,

find correspondence between the fiducial image and a model image,

estimate a camera pose, transform a position of the second device to model coordinates,

find the plurality of first unique identifiers and the plurality of second unique identifiers, wherein finding includes:

applying a first threshold to the fiducial image and a second threshold to an inverted fiducial image,

performing a connected component analysis on the first and second thresholds, and

applying a geometric filter to identify the region having the plurality of first unique identifiers and to determine weighted centroids of the plurality of first unique identifiers and the plurality of second unique identifiers.

2. The system of claim 1 , wherein the controller finds correspondence between the fiducial image and the model image by selecting the plurality of first unique identifiers from the fiducial image, arranging the plurality of first unique identifiers in clockwise order, arranging a plurality of model fiducials in clockwise order, computing a planar homography, transforming the plurality of model fiducials into image coordinates using the computed planar homography, finding a model fiducial from the plurality of model fiducials that matches the fiducial image, and computing a residual error.

3. The system of claim 2 , wherein the controller selects the plurality of first unique identifiers from the fiducial image by selecting the region having the plurality of first unique identifiers, counting a number of first unique identifiers in the selected region, comparing the number of first unique identifiers in the selected region to a predetermined number,

wherein if the number of first unique identifiers in the selected region equals the predetermined number, the method proceeds to arranging the plurality of first unique identifiers in clockwise order, and

wherein if the number of first unique identifiers in the selected region does not equal the predetermined number, a new region is selected and a number of first unique identifiers in the new region is counted.

4. The system of claim 1 , wherein one of the first threshold and the second threshold is a dynamic threshold.