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Changes
→skeletonization
*invert B & W.
*skeletonize: http://opencvpython.blogspot.com/2012/05/skeletonization-using-opencv-python.html
**<code>python skeletonize.py rescaled.png skeleton.png</code>
*trace (removing speckles):
**<code>/usr/local/bin/potrace skeleton.pnm -W 12.0 -H 9.0 -i -t 4 -b geojson -o skel.json</code>
