[Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border)

[Hartmut]

Follow-up Comment #2, bug #51884 (project octave):

Here is the current source code (just type "edit bwmorph" to see it):


    case "thicken"
      ## This implementation also "thickens" the border. To avoid this,
      ## a simple solution could be to add a border of 1 to the reversed
      ## image.
      bw = bwmorph (! bw, "thin", n);
      loop_once = true;
      morph = @(x) bwmorph (x, "diag");

[...]

  if (loop_once && n > 1)
    n = 1;
  endif

[...]

  while (i <= n) ## a for loop wouldn't work because n can be Inf
    bw2_tmp = morph (bw);
    if (isequal (bw, bw2_tmp))
      ## if it doesn't change we don't need to process it further
      break
    endif
    bw = bw2_tmp;
    i++;
  endwhile


Do you have a good suggestion how to improve this code (the "case thicken"
section) with your current insight into the topic? Could you include your
workaround into the code in a good way? (Or would you say that the problem is
already in the "thin" subroutine?)

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