The most important advantage of this multiresolution skeletal representation is that the selection of the skeleton pertaining to a specific resolution level boils down to mere thresholding. It is non trivial to determine which of the branches are spurious and which correspond to significant subregions.
Most algorithms use some deviation of morphological thinning.
Often, spurious branches are eliminated based upon some approximate property of the bounding contour, or based upon some property of the branch itself. Multiple resolution skeletons . In this process, Gaussian smoothing has become very popular. One approach consists of applying local weighted averaging with Gaussian weights. Dill et al.