The extraction of the road between two neighbor nodes is done by
ELIESER (for details, see demo ELIESER).
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The potential Vi(xi,xj) shows whether the road joining xi and xj, computed by ELIESER, has the characteristics of a real road.
The potential of a road section is computed as follows :
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The following figure shows the different zones defined to compute the image dependant potential term for a pair of nodes :