A discrete expression of Canny's criteria for step
Optimalfiltersforedgedetectionareusuallydevelopedinthecontinuousdomainandthentransposedbysamplingtothediscretedomain.Simplerfiltersaredirectlydefinedinthediscretedomain.Wedefinecriteriatocomparefilterperformancesinthediscretedomain.Cannyhasdefined(1983,1986)threecriteriatoderivethee
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