Before revision:  From the identified finger skeletons, we design a spanning contour tree-based method to capture how fingers branch in 3D space . Then, to display different facets of finger branches, we employ various tree-based visualization methods to plot the finger branches in a plane .
After revision:  From the identified finger skeletons, we design a spanning contour tree-based method to capture how fingers branch in 3D space from the finger skeletons .