[Octave-bug-tracker] [bug #45333] image package: grayhresh fails if input doesn't have different values

[Avinoam Kalma]

Follow-up Comment #9, bug #45333 (project octave):

There is still a minor problem in a corner case:


>> H(1) = 100;
>> graythresh(H)
warning: division by zero
warning: called from
    graythresh>otsu at line 217 column 13
    graythresh at line 186 column 35
warning: division by zero
warning: called from
    graythresh at line 192 column 12
ans = NaN


In Matlab the answer is zero.
The problem is in the line:

  thresh{1} = double (thresh{1}) / (numel (ihist) - 1);

since numel(ihist) is 1




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