Real Time Edge Detection in Haskell (disciple-devel.blogspot.com) 63 points by johngunderman 15y ago ↗ HN
[–] liuliu 15y ago ↗ It should be noted that the OpenCV implementation the article mentioned (I believe it refers to cvCanny) is highly optimized to integer operation - word8 (there are several approximation used to avoid computing arctan).
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