[Octave-bug-tracker] [bug #47879] image package: imerode and imdilate sets elements to Inf when SE is zero

[Carnë Draug]

Update of bug #47879 (project octave):

                 Summary: imerode Sets a bit to 1/Inf, when the center of the
strel is 0 => image package: imerode and imdilate sets elements to Inf when SE
is zero

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Follow-up Comment #1:

I originally asked the reporter to report it here since I thought it was a
bug. I'm not so sure anymore. The issue can be generalized by using a SE of
zero:


octave> imerode (zeros (3), 0)
ans =

   Inf   Inf   Inf
   Inf   Inf   Inf
   Inf   Inf   Inf



While searching the web, I found a post on stackoverflow asking why this odd
result. I have compiled my thoughts on that answer here
http://stackoverflow.com/a/37117842/1609556

This seems to boil down about finding min of an empty set, or whether erosion
should compute min or infimum (same for imdilation). I would appreciate
comments on this but I'm currently leaning towards actually being the correct
answer (but I will be the first to admit to code it by accident).

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