[Insight-users] Gaussian of masked images

[Kai Li]

Hi Luis,
   Thanks for your information, but what I exactly want is a filter for
"masked" image. This may looks weird you. What I meant is that some pixels
in a, say, grey image do not take part in the computation of the Gaussian.

Thanks,
Kai

On Fri, 2 Jul 2004, Luis Ibanez wrote:

>
> Hi Kai,
>
> If you are using large Gaussians you will find more
> efficient to use the LaplacianRecursiveGaussian filter
>
> http://www.itk.org/Insight/Doxygen/html/classitk_1_1LaplacianRecursiveGaussianImageFilter.html
>
> This filter internally uses IIR filters and therefore
> its computation time is independent of the size of your
> sigma.
>
> You will find examples on the use of this filter in the
> files
>
>
>    Insight/Examples/Filtering/
>         LaplacianRecursiveGaussianImageFilter1.cxx
>         LaplacianRecursiveGaussianImageFilter2.cxx
>         ScaleSpaceGenerator2D.cxx
>
>
>
>
>    Regards,
>
>
>      Luis
>
>
>
> -------------
> Kai Li wrote:
>
> > Hi,
> >   I'm in a situation where Laplacian of Gaussian(LoG) of masked images has
> > to be computed. I'm wondering if ITK has already provided something to
> > archieve this.
> >
> >   The method that I can come up with at this point is to use a
> > Difference-Of-Gaussian operator that can compute the Gaussian derivatives
> > for each pixel and mask the kernel of the operator dynamically for each pixel.
> > This method seems OK but not efficient for the computation in large
> > scale(sigma).
> >
> >   Any suggestion is highly appreciated.
> >
> > Kai
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
>
>
>