[Insight-users] Question about itkBSplineDeformableTransform

[Luis Ibanez]

Hi Luke,

This optimization has already been done as part of the effort for
multi-threading the image metrics.

You will find the new classes in the directory

     Insight/Code/Review

itkOptImageToImageMetric.h
itkOptImageToImageMetric.txx
itkOptMatchCardinalityImageToImageMetric.h
itkOptMatchCardinalityImageToImageMetric.txx
itkOptMattesMutualInformationImageToImageMetric.h
itkOptMattesMutualInformationImageToImageMetric.txx
itkOptMeanSquaresImageToImageMetric.h
itkOptMeanSquaresImageToImageMetric.txx


In order to take advantage of these multi-threaded method,
you simply need to enable the following CMake variables
at configuration time:

        * ITK_USE_REVIEW
        * ITK_USE_OPTIMIZED_REGISTRATION_METHODS


Please give it a try and let us know if you run into any
problems.


    Thanks


       Luis


-------------------
Luke Bloy wrote:
> Hi,
> 
> I'm using BSpliceDeformableTransform for a registration problem, using a 
> variation of a meanSquaresImageToImage metric. I'd like to speed it up 
> by making use of the fact that not all parameters are important for 
> transforming each voxel location. I believe that 
> itkMattesMutualInformationImageToImageMetric makes use of this to speed 
> up the computation of the derivative etc,but  I can't quite figure out 
> howto make it happen.
> 
> Ideally, given a voxel index, I'd like to be able to to determine which 
> parameters affect it's transformation. I think i can get this info from the
> GetJacobian 
> <http://www.itk.org/Doxygen310/html/classitk_1_1BSplineDeformableTransform.html#56d6093265189be09c75e684069ce92c> 
> (const InputPointType 
> <http://www.itk.org/Doxygen310/html/classitk_1_1Point.html> &inputPoint, 
> WeightsType <http://www.itk.org/Doxygen310/html/classitk_1_1Array.html> 
> &weights, ParameterIndexArrayType 
> <http://www.itk.org/Doxygen310/html/classitk_1_1Array.html> &indices) 
> method, but I'm not sure what it returns in weighs or in indices.
> 
> Any help would be greatly appreciated.
> 
> Thanks,
> Luke
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