9. The apparatus of claim 8 , wherein the processor is further configured to calculate a distance transform function of the transformed binary images of the new contour and the at least one additional contour.
9. The apparatus of claim 8 , wherein the processor is further configured to calculate a distance transform function of the transformed binary images of the new contour and the at least one additional contour. 10. The apparatus of claim 9 , wherein the distance function is a sum of absolute values of coordinate differences for two pixels, one pixel being part of the new contour and the other pixel being part of the at least one additional contour.