Abstract
Measures of Circularity for Automatic Inspection ApplicationsJ Illingworth and J KittlerSERC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, UKAbstractMany automatic visual inspection applications involve checking circular holes. In thispaper four circularity measures based on shape compactness, distribution of radius values,distribution of chord lengths between random border points and the Hough transform arecomparatively studied. Properties of the various approaches are investigated over a rangeof image resolutions which are considered to be pertinent to industrial inspection tasks.IntroductionMany automatic visual inspection applications involve checking circular holes. Theparameters that need to be verified include the size, position and circularity of the hole
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