WITH VOXEL DATA
Several silhouette images of the
subject's hand was generated using a statistical
background segmentation algorithm.
These silhouettes are in turn used to
generate the voxel reconstruction of the hand.
For an extended hand, the fingertips
can extracted easily by labeling the voxels by proximity
to the central palm voxel. A tree is constructed where
each node is a cluster of voxels with a common label and
26-neighbor of each other. Working from the leaves,
choose the five largest clusters above a particular
threshold. The tree is trimmed of small isolated
clusters by reincorporating those clusters into the
closest clusters with the same label.
The result are the five finger tips,
which can be used as landmarks for hand model fitting.