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

[Bradley Lowekamp]

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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