[Insight-users] Re sampleImageFilter and ITK_USE_OPTIMIZED_REGISTRATION_METHODS

[Luis Ibanez]

Hi Peter,

In Summary:

    The "Optimized" methods are "Multi-Threaded"

We shouldn't have called them "Optimized",
since after all, what is "Optimal" ?..


The main change is that the two metrics:

* MattesMutualInformation
* MeanSquares

Now distribute the computation of

* GetValue()
* GetValueAndDerivative()

over multiple-threads, and therefore they give you
close to linear speedup with the number of cores
or processor that you have.


The Resample image filter already knows how to distribute
its load over multiple threads.  There is no benefit in you
trying to do that distribution manually.


You can easily verify this by running any of the many
examples in the directory:

          Insight/Examples/Registration

and monitoring the use of your CPU.


Please let us know what you find.


   Thanks


            Luis


-------------------------------------------------------------------------------------
On Mon, Oct 19, 2009 at 8:26 PM, Pete79 <pkoniusz at hotmail.com> wrote:
>
> Dear all.
>
> Can anyone explain to me in detail what is the difference between Optimised
> Registration Methods and those non-optimised? I'm trying to figure out if
> running ResampleImageFilter in separate threads managed by me (not by
> multithreading itk functionality) is going to bring any gain really over
> sequential computations.
>
>
> Many Thanks,
> Peter
> --
> View this message in context: http://www.nabble.com/ResampleImageFilter-and-ITK_USE_OPTIMIZED_REGISTRATION_METHODS-tp25967879p25967879.html
> Sent from the ITK - Users mailing list archive at Nabble.com.
>
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