[Octave-bug-tracker] [bug #46099] image package: edge(I, 'canny') gives very bad quality results

[Hartmut]

Follow-up Comment #18, bug #46099 (project octave):

>From my side you can CLOSE this bug report now.

I can (only) see the following issues still open:
* Your new tests on the returned threshold VALUES are not Matlab compatible.
Do we want to mention this somewhere in a comment near the tests?
* The AUTOMATIC calculation of THRESHOLD values in Matlab seems to be very
fancy in some cases. (This seems to be only an incompatibility of the Canny
method in edge.m.) But I am not willing to further investigate this just to
perfectly mimic the Matlab behavior, here. The current Octave implementation
of the Canny edge detection gives good results of the same quality as in
Matlab. And the Octave version of the Canny edge detector also does some
reasonable estimation of an automatic threshold. I think this level of
compatibility is good enough for most use cases (at least it is good enough
for my use cases). 
* There is still a DIFFERENT BUG REPORT open (bug #46547) that deals with the
Canny edge detection method. This bug might or might not be already solved
with our recent patches as well.

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