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

[Zoltan Seress]

Hi,

Thank to both of you. Karthik, your solution seems to work!

On Sat, Jun 5, 2010 at 5:38 AM, Karthik Krishnan <
karthik.krishnan at kitware.com> wrote:

> 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
>
>


-- 
Zoli
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