Qualitative tracking of 3-D objects using active contour networks
Dickinson, S.J.
Jasiobedzki, P.
Olofsson, G.
Christensen, H.I.
Dept. of Comput. Sci., Toronto Univ., Ont.;
Abstract
In this paper, we track changes in the appearance of the object as
it moves from one frame to the next. At a symbolic level, an aspect
graph clusters all the views of an object into a set of topologically
distinct classes in terms of which surfaces of an object are visible
from a given viewpoint (Koenderink and van Doom (1979). Two nodes (or
aspects) in the aspect graph are connected by an arc if it is possible
to directly move from a viewpoint in which the first aspect is visible
to a viewpoint in which the second aspect is visible. Qualitatively, we
can envision a tracking strategy which simply tracks an object as it
moves from one node to another in the object's aspect graph. Although it
does not provide us with accurate pose of the object, it does
qualitatively describe the motion of the object without the need for a
CAD representation of the object
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