[Insight-users] GradientVectorFlowImageFilter

[Kishore Mosaliganti]

Hi Isobella,

The first parameter reduces the variational energy as the iterations
continue. So, the vector field closely matches the gradients at object
boundaries and in other regions ( noisy regions without strong
gradients), it is smoothly interpolated.

The second parameter tells you where boundaries end and noisy regions
begin. A higher value means you are starting the interpolation quite
early and your images are quite noisy.

The second parameter is more significant than the first. You can set
iterations to 20 or 30 initially and the second parameter to 1. You
may have to play around with the parameters a bit to arrive at
suitable settings for images.


Kishore

On Mon, Nov 16, 2009 at 5:04 AM, isobella king
<isobella.king at googlemail.com> wrote:
> Hello,
> Could anyone help to explain about the parameters required in
> using GradientVectorFlowImageFilter?
> one is numberOfIterations, the other is noiseLevel.
> How do these two parameters affect the filtering? What are the suitable
> ranges for choosing values for them?
> many thank in advance!
> Isobella
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