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The Burns Line Finder
1.  Compute gradient magnitude and direction at each pixel.
2.  For high gradient magnitude points, assign direction labels
     to two symbolic images for two different quantizations.
3.  Find connected components of each symbolic image.
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•  Each pixel belongs to 2 components, one for each symbolic image.
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•  Each pixel votes for its longer component.
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•  Each component receives a count of pixels who voted for it.
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•  The components that receive majority support are selected.
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