[ITK-users] Mattes Mutual Information Metric - MultiThread

[Ivan Setiawan]

Hi Hans,

Thank you very much for clarifying.
Glad to know that now multi-thread is OK for MattesMI.

Thank you and best regards,
Ivan

--- On Wed, 2014/4/23, Johnson, Hans J <hans-johnson at uiowa.edu> wrote:

> I believe this was fixed.
> 
> I created a new gerrit-patch to update the documentation:
> http://review.source.kitware.com/#/c/15249/
> 
> The note about multi-threading not working was placed there in 2002, and
> there was a lot of work done to address multithreading since that time.
> 
> Multithreading was fixed in 2011 in preparation for
> using MI for BRAINSTools testing and for inclusion into
> Slicer.  It was fixed in patch set
> f542d0c75848ccb8bf35130a896da2fdb1a10d2c,
> but the comment was overlooked.
> 
> 
> Hans
> 
> 
> 
> On 4/23/14, 6:41 AM, "Ivan Setiawan" <ivans at yahoo.co.jp> wrote:
> 
> >Dear all,
> >
> >I have a question regarding multi-threading in
> >itk::MattesMutualInformationImageToImageMetric.
> >Currently I am using v4.4.0.
> >
> >The document below has a note that "2. This class in not thread safe due
> >the private data structures used to the store the sampled points and the
> >marginal and joint pdfs."
> >http://www.itk.org/Doxygen44/html/classitk_1_1MattesMutualInformationImage
> >ToImageMetric.html
> >
> >However, I have tried with SetNumberOfThreads(1) and
> >SetNumberOfThreads(16) and found that both single- or multi-thread gave
> >the same bit-exact result.
> >Of course, the one with SetNumberOfThreads(16) processed much faster.
> >
> >So my question, is it OK to use
> >itk::MattesMutualInformationImageToImageMetric with multi-thread even
> >though the document says not to?
> >
> >Thank you and best regards,
> >Ivan
> >
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