[ITK-users] OtsuMultipleThresholdsImageFilter creates asymmetric classes for symmetric a distribution

[Matt McCormick]

Hi Frederik,

Since this is a statistical method, it should be tested with more than
four samples. Please try creating a distribution of values with
hundreds of samples for each mode.

Hope this helps,
Matt

On Wed, Oct 18, 2017 at 10:47 AM, Dženan Zukić <dzenanz at gmail.com> wrote:
> Hi Frederik,
>
> I agree that the threshold should be larger than 2000, and should not depend
> on whether the number of histogram bins is 127, 128 or 129 - with this many
> bins it really shouldn't matter.
>
> This example is simple enough that it would be worthwhile to step through
> the code of OtsuMultipleThresholdsCalculator to see why it doesn't produce
> the result we expect. This might lead to a bug fix.
>
> Will you do it Frederik? Or wait for Francois or me to get around to it? If
> you do, please report the findings on discourse, or submit a patch to
> Gerrit.
>
> Regards,
> Dženan
>
> On Wed, Oct 18, 2017 at 3:03 AM, hellman <fredrik.hellman at gmail.com> wrote:
>>
>> Hi Dženan,
>>
>> With 127 bins I get: 2004.02
>>
>> With 129 bins I get: 1988.45
>>
>> Best wishes,
>> Fredrik
>>
>>
>>
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