[ITK-users] MutualInformationImageToImageMetric without transformation

[carlos]

Dear Jan,

I think that you can use the metric without optimizer, but that you need a
transformation and an interpolator. You can use the translation transform
(and the interpolator you prefer, although it will not influence):
typedef itk::MutualInformationImageToImageMetric<ImageType, ImageType>
MIMetricType;
MIMetricType::Pointer MImetric;
typedef itk::TranslationTransform< double, ImageDimension > TransformType;
TransformType::Pointer transform = TransformType::New();
MImetric->SetTransform(transform);

and then call GetValue with the translation parameters [0,0]
MIMetricType::TransformParametersType
displacementMI(transform->ParametersDimension);
displacementMI[0] = 0;
displacementMI[1] = 0;
MImetric->GetValue(displacementMI);


Best regards
Carlos



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