[Insight-developers] GetMinimumMetricValuePosition

[Rupert Brooks]

Hi folks,

Im going to repeat a question I asked last month - I asked it just
before ITK 3.8 release, so everyones minds were elsewhere.  Basically
this involves a bug that was closed, but I think still exists.  I
think that the ExhaustiveOptimizer does not agree with the definition
of its base class (Optimizer) and so cannot be dropped in as a plug in
replacement for another optimizer.

Im curious if this is a design decision?

Thanks
Rupert

On Mon, Jul 14, 2008 at 1:18 PM, Rupert Brooks <rupe.brooks at gmail.com> wrote:
> Hi,
>
> I was just examining the solution for the itkExhaustiveOptimizer
> problem reported here
> http://www.itk.org/Bug/view.php?id=5342
>
> One of the problems reported was that the optimizer could not be used
> in the registration framework - its GetCurrentValue reports the last
> place explored, which is not necessarily the best one.
>
> The current test for this optimizer uses the method
> GetMinimumMetricValuePosition - and this works fine for finding the
> minimum - so the test passes.  However, this does not seem to be a
> general method for all optimizers.  Specifically - the
> ImageRegistrationMethod uses ->GetCurrentPosition to find the optimal
> transformation parameters.
>
> To my way of thinking the bug is not fixed - but the bug was closed.
> Am i out in left field here?  Note that i was the original reporter of
> the bug - so perhaps im not getting something.
>
> Cheers,
> Rupert
>
> --
> --------------------------------------------------------------
> Rupert Brooks
> McGill Centre for Intelligent Machines (www.cim.mcgill.ca)
> Ph.D Student, Electrical and Computer Engineering
> http://www.cyberus.ca/~rbrooks
>



-- 
--------------------------------------------------------------
Rupert Brooks
McGill Centre for Intelligent Machines (www.cim.mcgill.ca)
Ph.D Student, Electrical and Computer Engineering
http://www.cyberus.ca/~rbrooks