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. Author manuscript; available in PMC: 2019 Oct 29.
Published in final edited form as: Phys Med Biol. 2018 Oct 29;63(21):215016. doi: 10.1088/1361-6560/aae761

Figure 3:

Figure 3:

Computing the approximate initialization pose using a Haar filter dictionary. The dictionary is pre-computed from 2D slices extracted from the 3D US image acquired prior to the procedure. During the procedure Haar coefficients computed from the live 2D image are matched against the dictionary to find the closest matching US probe pose.