Figure 4From: Automatic segmentation of coronary angiograms based on fuzzy inferring and probabilistic tracking Using the circular pattern detector to characterize the vessel structures, in the cases with bifurcation, paralleling, and crossing patterns. (a1)-(c1) are original images and the respective regions of interest. (a2)-(c2) are the corresponding direction maps overlaping with circular pattern detectors. (a3)-(c3) are the corresponding vessel-feature profiles on the circular template T (x,r,t). (a4)-(c4) are the corresponding magnitude profiles of the first-order derivative dT (x ,r,t).Back to article page