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Candidates

imagemagick -threshold

convert -threshold xx


original


threshold 30


threshold 40


threshold 50


threshold 60

imagemagick plugins

Scripts available here: http://www.fmwconcepts.com/imagemagick/

fuzzyc - takes a long time.


original


fuzzy threshold 0.5


fuzzy threshold 1.0


fuzzy threshold 1.5


fuzzy threshold 1.5

local adaptive threshold


original


radius 15 (default), bias 20 (default)


radius 20, bias 20 (default)


radius 3.0, bias 30


radius 80, bias 50

Sahoo threshold


original


power 2 (default)


power 6


power 12


power 24

Other methods


original


isodata threshold - slow
but quicker than fuzzyc


kapur threshold


kmean threshold


original


otsuth threshold


triangle threshold


2colorthresh

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