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Since our objective is to reconstruct a certain real space where
people work, it is reasonable to have a knowledge of static objects in
the space in advance. As the static objects do not change their
positions and shapes, we can exclude the subspace where the static
objects occupy. We call the subspace as static object occupation
subspace (SOOS) denoted by 
. If we see the target space
from the viewpoint of camera i, some subspaces cannot be seen
because 
occludes them. We merge these occluded subspaces
into 
and call it static object influence subspace
(SOIS) 
.
From now on, we concentrate on reconstructing the voxels which represent dynamic objects in the target space.