[Insight-users] MedianImageFunction -- questions

[robert tamburo]

Hi Robert,

The key function calls for MedianImageFunction are:
medianFunction->SetInputImage(img); // sets input image
medianFunction->SetNeighborhoodRadius(r); // sets neighborhood radius
medianFunction->EvaluateAtIndex(idx);  // returns median value of img pixels
in a neighborhood of radius r centered at idx

On Wed, Mar 16, 2011 at 11:40 AM, <Robert.Atwood at diamond.ac.uk> wrote:

> Hi,
> I want to evaluate the median at several points in the image, rather than
> median filter the whole image and query those points. This would be simple
> if I could use itk::MedianImageFunction
> However, I don't understand how to use this. How do you set the
> neighbourhood?
> The doxygen does not seem to show me any function for setting this, and
> inspecting the code I find this segment, as far as I can tell it always
> creates a 1x1x1 kernel? That's not what I want , do I misunderstand? The
> Doxygen states
>
> "
> Calculate the median value in the neighborhood of a pixel.
>
> Calculate the median pixel value over the standard 8, 26, etc. connected
> neighborhood. This calculation uses a ZeroFluxNeumannBoundaryCondition.
> "
>
> How do I access the "26,etc" neighbourhoods? Thanks
> Robert
>
>
> ./ITK/Code/Common/itkMedianImageFunction.txx:
>
>
>  73   // Create an N-d neighborhood kernel, using a zeroflux boundary
> condition
>  74   typename InputImageType::SizeType kernelSize;
>  75   kernelSize.Fill( 1 );
>  76
>  77   ConstNeighborhoodIterator<InputImageType>
>  78     it(kernelSize, this->GetInputImage(),
> this->GetInputImage()->GetBufferedRegion());
>  79
>
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