Yes, I read it. It also includes a variety of optional or ambiguous aspects. For example, the edge detection algorithm should - from the description - include some edge around the border of the image. And yet the example edge-detection result shows no such edges, nor is the matter discussed anywhere that I noticed.
See also the references to "Improvement". But note also the use of the word "may" in the rosettacode task page and the quantization of angles in step 3. I expect that most of these issues come down to which approximations one uses and of course how one treats "edge cases" (pun intended). But that's sort of the entire issue, isn't it? Thanks, -- Raul On Sun, Apr 26, 2015 at 4:33 PM, Skip Cave <[email protected]> wrote: > Raul, > > Wikipedia has a pretty well-defined spec for Canny edge detection: > > http://en.m.wikipedia.org/wiki/Canny_edge_detector > > Skip > On Apr 26, 2015 2:39 PM, "Raul Miller" <[email protected]> wrote: > >> http://rosettacode.org/wiki/Canny_edge_detector currently does not >> have a J implementation. >> >> Worse, the task itself is somewhat ill-specified, with a variety of >> open-ended possibilities. >> >> This suggests, to me, that it would be better handled by someone who >> works images and/or edge detection in some other contexts (because >> this kind of experience would helpfully inform the implementation >> decisions). >> >> Anyone interested? >> >> Thanks, >> >> -- >> Raul >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
