[ITK-users] MultiResImageRegistration3 | Joint PDF summed to Zero

[Matias Montroull]

Thanks Btradley,

I'm using ITV4 with compatibility set to V3, not sure if that would be an
issue.

I tried adding the Centeredtransforminitializer to my example but it seems
I need to change the transformtype to CenterRigidTransform rather than
TranslationTransform, is that true? (I'm getting compilation erros)..

The example you point is 2D, I don't think there has been a 3D version of
the MultiResImageRegistration1 with V4.. I'll try though to see if I can
convert to 3D, it was pretty simple with the V3 version example.

Thanks again.

Matias.

On Wed, Feb 11, 2015 at 11:01 AM, Bradley Lowekamp <blowekamp at mail.nih.gov>
wrote:

> Hello,
>
> This message occurs when the images don't overlap.
>
> If this error message occurs at the first iteration, its due to the
> initial parameters. If not then the optimizer is not setup correctly and is
> miss behaving due to scale, minimizing/maximizing, gradient noise etc..
>
> Typically the CenterTransformInitializer[1] can be used to get reasonable
> initial parameters for many cases.
>
> Also you are using the older ITKv3 registration framework. I would
> recommend using the v4 version of the example[2], I believe it give a
> clearer error message for this case.
>
> Brad
>
>
> [1]
> http://www.itk.org/Doxygen/html/classitk_1_1CenteredTransformInitializer.html
> [2]
> http://www.itk.org/Doxygen/html/Examples_2RegistrationITKv4_2MultiResImageRegistration1_8cxx-example.html
> On Feb 11, 2015, at 8:50 AM, Matias Montroull <matimontg at gmail.com> wrote:
>
> Hi,
>
> I'm trying to do 3D Registration using TranslationTransform as
> transformtype. I've downloaded MultiResImageRegistration3.cxx and when I
> run it I get this error:
>
> *Description: itk::ERROR:
> MattesMutualInformationImageToImageMetric(04067A40): Joint PDF summed to
> zero*
>
> Is this due to the initial parameters?
>
> Thanks,
>
> Matias.
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