[Octave-bug-tracker] [bug #46390] image package - im2bw interprets threshold slightly different than Matlab

[Avinoam Kalma]

Follow-up Comment #7, bug #46390 (project octave):

Thanks for improving the patch.

There are still two problems with the fix:
1. The addition of 1 to the range is wrong
2. ceil should be replaced by floor.

see for example:


I = uint8([0:255]);

S = 0;
for i=0:10
    bw = im2bw(I, i/10);
    s = sum(bw);
    S = S+s;
end

disp(S);


Matlab (2010b) result is 1405, while Octave result is 1394. 
We can add this small example as a BIST.


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