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fix a typo in the canny docs

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JR Heard 2016-11-30 16:52:28 -08:00 committed by GitHub
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doc/tutorials/imgproc/imgtrans/canny_detector/canny_detector.markdown
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@ -12,7 +12,7 @@ Theory
------
The *Canny Edge detector* was developed by John F. Canny in 1986. Also known to many as the
*optimal detector*, Canny algorithm aims to satisfy three main criteria:
*optimal detector*, the Canny algorithm aims to satisfy three main criteria:
- **Low error rate:** Meaning a good detection of only existent edges.
- **Good localization:** The distance between edge pixels detected and real edge pixels have
to be minimized.