The algorithm needs to surpress non-maxima perpendicular to the edge direction.
Thomas Boudier has kindly produced an edge detection plugin based on Canny-Deriche filtering. The non-maximal suppression and hysteresis are described here. This allows to reduce the edges to binary elements.
Some code is available here: http://www.cs.ucf.edu/~mikel/Research/Edge_Detection.htm
Done! Posted by G. Landini at 2007-01-03 15:14 Please see: http://imagejdocu.tudor.lu/Members/tboudier/plonearticle.2006-07-12.2524848149/ and: http://imagejdocu.tudor.lu/Members/tboudier/plonearticle.2007-01-03.5171158213/ Thanks, Thomas!