[Insight-users] Difference between 3.4 and 3.14 for MattesMutualInformation Registration ?

[Luis Ibanez]

Hi Uma,

Do your images have Orientation ?

That is, the value of their Direction matrix,
is it different from Identity ?

If so, the behavior of ITK 3.14 will be more
appropriate than the behavior of ITK 3.4.

Also:

Have you turned ON the use of the REVIEW
directory ?

are you using the flag

ITK_USE_OPTIMIZED_REGISTRATION_METHODS  ?


---

To assist you better, we will need more details
about the registration that you are performing.


      Thanks


             Luis


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On Sat, Mar 27, 2010 at 1:26 PM, Uma Ranjan <usranjan at gmail.com> wrote:
> Dear all,
>
>
>  I see a difference in the transform values (and visual performance) between
> ITK 3.4 and 3.14 versions for the same images and identical parameters.
>
>
>
>  I use VersorRigid3DTransform  with LinearInterpolateImageFunction as
> interpolator,  MattesMutualInformationImageToImageMetric as metric and
> VersorRigid3DTransformOptimizer as optimizer.
>
> The performance seemed to be better in 3.4. Is there anything additional
> that I need to specify between the two versions ?
>
> I have set the following parameters for the optimizer :
>    SetScales(optimizerScales), setMaximumStepLength(.),
> setMinimumStepLength(.),SetNumberOfIterations(.), setRelaxationFactor(.),
> MinimizeOn() ;
>
> For the Metric, I set the following :
>
>  SetNumberOfHistogramBins(), SetNumberOfSpatialSamples(.),
> ReiniitalizeSeed(.),
>
> Best regards
>
> Uma Ranjan
>
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