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855d51bf48
Important part of this algorithm is the double threshold step: pixels above "high" threshold being kept, pixels below "low" threshold dropped, pixels in between (weak edges) are kept if they are neighboring "high" pixels. The weak edge check uses a neighboring context and should not be applied on the plane's border. The condition was incorrect and has been fixed in the commit. Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com> Reviewed-by: Andriy Gelman <andriy.gelman@gmail.com>