[vtkusers] vtkImageAnisotropicDiffusion3D

[Marie HUC]

Thanks Kevin,

Indeed, my threshold wasn't high enough !
I 'd increased it over 1000 with gradient magnitude threshold activated and
over 100 with pixel gradient threshold activated. And it's better when the
number of iterations is high.

An other point for the next users of this filter : when you use the
vtkImageAnisotropicDiffusion2D on one slice of your volume, the threshold
will be totally diiferent. So if it works on a volume'slice, it'll not
necessarily work on the volume and inversely !

2009/6/9 Kevin H. Hobbs <hobbsk at ohiou.edu>

> On Mon, 2009-06-08 at 15:29 +0200, Marie HUC wrote:
> > Hi,
> >
> > I’m trying to apply the vtkImageAnisotropicDiffusion3D filter which
> > use vtkImageData.  I have tried many parameters but without success:
> > the compilation works, but after the execution, nothing happens (I
> > have exactly the same volume when I visualize it with a renderer).
> >
> > Is there anyone that have used this filter and had some results?
> >
>
> I've used this filter. My bet is that either your threshold is too low,
> your number of iterations is too low, or your diffusion factor is too
> low...
>
> > Moreover, I would like to compare the two volumes (initial volume and
> > filtered volume) in order to see if the filter has an effect but I
> > don’t know how to compare two vtkImageData…?
>
> You might want to try the vtkImageCheckerboard class.
>
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