graph.route_through_array, a route is "outside"

[jip]

Hello,

A contour is extracted from a greyscale image ("walls") where the 
background is set to 255. Several points near the contour are used to 
compute a path with graph.route_through_array:
mincost = graph.route_through_array(walls ,p1,p2,fully_connected=True)

One found path is not completely inside the array. When 
fully_connected=False is used all the paths are inside the chromosomes 
(i.e. they do not cross regions where grey level=255).

How to get a minimal cost route "inside" a particle (<>255)?

Thank you

Jean-Patrick

<https://lh6.googleusercontent.com/-YBi4a6avWfw/UJvgFAyisjI/AAAAAAAAA98/A5ADkHtZBhY/s1600/geodesic_Distance-montage03b.png>
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