[Insight-users] correlation coefficient histogram metric on 2 images

[Karthik Krishnan]

On Fri, Jun 4, 2010 at 7:38 PM, Zoltan Seress <seress.zoltan at gmail.com>wrote:

> Hi all,
>
> My problem is very simple. I have 2 images (same size) and I want to
> compute the correlation coefficient between them. Can
> itkCorrelationCoefficientHistogramImageToImageMetric class be used for this
> some way? I do not need any registration process, only the simple CC value
> between the images. Or does this class need an optimizer to work correctly?
>

You can use the metric classes independent of the registration process. You
need initialize it properly..

Something like this should work:

  MetricType::Pointer metric = MetricType::New();
  metric->SetFixedImage( image1 );
  metric->SetMovingImage( image2 );

  typedef itk::IdentityTransform< double, Dimension >  TransformType;
  TransformType::Pointer transform = TransformType::New();
  metric->SetTransform( transform );

  typedef itk::LinearInterpolateImageFunction<
           ImageType, double > InterpolatorType;
  InterpolatorType::Pointer interpolator  = InterpolatorType::New();
  metric->SetInterpolator( interpolator );

  metric->SetFixedImageRegion( image1->GetBufferedRegion() );
  metric->Initialize();
  const double metricValue = metric->GetValue( transform->GetParameters() );


--
karthik
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