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# Do this in multiple passes, i.e. after the north pass, use the same semi processed image in the other passes and so on.
# Remove a point if:<br />The point has no neighbors in the North (if you are in the north pass, and respective directions for other passes).<br />The point is not the end of a line.<br />The point is isolated.<br />Removing the points will not cause to disconnect its neighbors in any way.
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The number of passes across direction should be chosen according to the level of accuracy desired.
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