[Octave-bug-tracker] [bug #46570] Image package: wrong result with edge

[Carnë Draug]

Follow-up Comment #11, bug #46570 (project octave):

So after this change, there's no difference between the sobel, prewitt, and
kirsch methods?  Or am I missing something?

A small performance fix. In place operators reduce memory usage, so instead
of:


  h1 = h1 ./ sum (sum (abs (h1)))


use:


  h1 ./= sum (sum (abs (h1)))


Also, use `sum (abs (x(:)))` (unless you really are coding for ND and want to
normalize each plane by the sum of that plane, and on which case specify the
dimension number as part of the call to sum).

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